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Wake Forest University
1.
Lillie, Elizabeth Marie.
Validation and Evaluation of Cortical and Full Skull Thickness Changes with Age and Sex.
Degree: 2014, Wake Forest University
URL: http://hdl.handle.net/10339/39320
► It is estimated there are 1.7 million cases of traumatic brain injuries (TBI) each year where falls and motor vehicle crashes (MVCs) are the number…
(more)
▼ It is estimated there are 1.7 million cases of traumatic brain injuries (TBI) each year where falls and motor vehicle crashes (MVCs) are the number one and two contributors. From 2002-2006 TBI accounted for 30% of all injury related deaths seen from emergency department visits despite the lower injury occurrence rate of 5%. Furthermore the TBIs from MVCs resulted in the largest number of TBI-related deaths (31.8%). Although studies have been conducted analyzing TBI from blunt loading conditions, more information is needed to understand the biomechanical contributors to the type and severity of TBI. One important contributor is believed to be skull deformation, and characterizing the skull's thickness and how it changes is an important step toward understanding skull deformation potential and its attribution to TBI.
Subjects/Keywords: Computed Tomography
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APA (6th Edition):
Lillie, E. M. (2014). Validation and Evaluation of Cortical and Full Skull Thickness Changes with Age and Sex. (Thesis). Wake Forest University. Retrieved from http://hdl.handle.net/10339/39320
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lillie, Elizabeth Marie. “Validation and Evaluation of Cortical and Full Skull Thickness Changes with Age and Sex.” 2014. Thesis, Wake Forest University. Accessed March 01, 2021.
http://hdl.handle.net/10339/39320.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lillie, Elizabeth Marie. “Validation and Evaluation of Cortical and Full Skull Thickness Changes with Age and Sex.” 2014. Web. 01 Mar 2021.
Vancouver:
Lillie EM. Validation and Evaluation of Cortical and Full Skull Thickness Changes with Age and Sex. [Internet] [Thesis]. Wake Forest University; 2014. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10339/39320.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lillie EM. Validation and Evaluation of Cortical and Full Skull Thickness Changes with Age and Sex. [Thesis]. Wake Forest University; 2014. Available from: http://hdl.handle.net/10339/39320
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Wake Forest University
2.
Walb, Matthew Charles.
Low Dose Dosimetry and Radiation Response in Rodent Models.
Degree: 2016, Wake Forest University
URL: http://hdl.handle.net/10339/59295
► Exposure to ionizing radiation from diagnostic imaging procedures has dramatically increased in the last three decades. Computed tomography is a powerful and invaluable diagnostic imaging…
(more)
▼ Exposure to ionizing radiation from diagnostic imaging procedures has dramatically increased in the last three decades. Computed tomography is a powerful and invaluable diagnostic imaging tool, but it is essential that the radiation risks be appropriately quantified so that clinicians are in the best possible position to assess the risks and benefits associated with its use. Our group uses sophisticated small animal lung tumorigenesis models to investigate the carcinogenic risks of low dose radiation.
Subjects/Keywords: computed tomography
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Walb, M. C. (2016). Low Dose Dosimetry and Radiation Response in Rodent Models. (Thesis). Wake Forest University. Retrieved from http://hdl.handle.net/10339/59295
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Walb, Matthew Charles. “Low Dose Dosimetry and Radiation Response in Rodent Models.” 2016. Thesis, Wake Forest University. Accessed March 01, 2021.
http://hdl.handle.net/10339/59295.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Walb, Matthew Charles. “Low Dose Dosimetry and Radiation Response in Rodent Models.” 2016. Web. 01 Mar 2021.
Vancouver:
Walb MC. Low Dose Dosimetry and Radiation Response in Rodent Models. [Internet] [Thesis]. Wake Forest University; 2016. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10339/59295.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Walb MC. Low Dose Dosimetry and Radiation Response in Rodent Models. [Thesis]. Wake Forest University; 2016. Available from: http://hdl.handle.net/10339/59295
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University
3.
Delgado, Diana (Diana Carolina).
Iterative reconstruction methods of CT images using a statistical framework.
Degree: MS, Electrical and Computer Engineering, 2010, Oregon State University
URL: http://hdl.handle.net/1957/16368
► Medical imaging technologies play a vital role in early diagnosis of disease by providing internal images of the human body to medical professionals. Computed Tomography…
(more)
▼ Medical imaging technologies play a vital role in early diagnosis of disease by providing internal images of the human body to medical professionals.
Computed Tomography (CT) is currently the most commonly used medical imaging technology because it is easy to use, detectors and scanners are constantly improving, and more importantly, patients receive less radiation compared to other imaging technologies. This thesis focuses on improving CT reconstruction algorithms by incorporating prior knowledge of the tissues being scanned. A Gaussian Mixture Prior, and Gibbs sampling is introduced into the reconstruction framework and solved using Maximum-a-posterior (MAP). As a comparison, the images were also reconstructed using unregularized and regularized Maximum Likelihood (ML).
Advisors/Committee Members: Raich, Raviv (advisor), von Jouanne, Annette (committee member).
Subjects/Keywords: Computed Tomography (CT); Tomography
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APA (6th Edition):
Delgado, D. (. C. (2010). Iterative reconstruction methods of CT images using a statistical framework. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/16368
Chicago Manual of Style (16th Edition):
Delgado, Diana (Diana Carolina). “Iterative reconstruction methods of CT images using a statistical framework.” 2010. Masters Thesis, Oregon State University. Accessed March 01, 2021.
http://hdl.handle.net/1957/16368.
MLA Handbook (7th Edition):
Delgado, Diana (Diana Carolina). “Iterative reconstruction methods of CT images using a statistical framework.” 2010. Web. 01 Mar 2021.
Vancouver:
Delgado D(C. Iterative reconstruction methods of CT images using a statistical framework. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/1957/16368.
Council of Science Editors:
Delgado D(C. Iterative reconstruction methods of CT images using a statistical framework. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/16368

Baylor University
4.
McCarty, Sarah Anne, 1994-.
Development of the particle technology research portfolio online reporting tool.
Degree: M.S.E.C.E., Baylor University. Dept. of Electrical & Computer Engineering., 2017, Baylor University
URL: http://hdl.handle.net/2104/10055
► Baylor University is part of the Particle Computed Tomography (pCT) Research Collective which performs research in medical imaging using protons and other particles to quickly…
(more)
▼ Baylor University is part of the Particle
Computed Tomography (pCT) Research Collective which performs research in medical imaging using protons and other particles to quickly and accurately image the human body. Data sharing between the researchers and the ability to process the received data and reconstruct images is imperative to continuing in this work. The system previously in place was highly reliant on the users and processing was limited to the few who developed the code base. This document details the design and implementation of the Particle Technology Research Portfolio Online Reporting Tool which allows users to upload data to a common database, search through previously uploaded data sets, and select data sets to be processed on Baylor’s Kodiak computing cluster. This tool prioritizes the security of medical data and allows for future expansion of the system to the clinics where pCT imaging machines will be installed and utilized.
Advisors/Committee Members: Schubert, Keith Evan. (advisor).
Subjects/Keywords: Particle Computed Tomography.
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APA (6th Edition):
McCarty, Sarah Anne, 1. (2017). Development of the particle technology research portfolio online reporting tool. (Masters Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/10055
Chicago Manual of Style (16th Edition):
McCarty, Sarah Anne, 1994-. “Development of the particle technology research portfolio online reporting tool.” 2017. Masters Thesis, Baylor University. Accessed March 01, 2021.
http://hdl.handle.net/2104/10055.
MLA Handbook (7th Edition):
McCarty, Sarah Anne, 1994-. “Development of the particle technology research portfolio online reporting tool.” 2017. Web. 01 Mar 2021.
Vancouver:
McCarty, Sarah Anne 1. Development of the particle technology research portfolio online reporting tool. [Internet] [Masters thesis]. Baylor University; 2017. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/2104/10055.
Council of Science Editors:
McCarty, Sarah Anne 1. Development of the particle technology research portfolio online reporting tool. [Masters Thesis]. Baylor University; 2017. Available from: http://hdl.handle.net/2104/10055

University of Alberta
5.
Lemieux, Genevieve.
Development of a Three Dimensional Maxillary Superimposition
Plane Using Cone Beam Computed Tomography.
Degree: MS, Medical Sciences-Orthodontics, 2014, University of Alberta
URL: https://era.library.ualberta.ca/files/kh04dr22t
► Introduction: Cone beam computed tomography (CBCT) is a new diagnostic and treatment planning tool in orthodontics. The purpose of this thesis is to determine precise…
(more)
▼ Introduction: Cone beam computed tomography (CBCT) is
a new diagnostic and treatment planning tool in orthodontics. The
purpose of this thesis is to determine precise landmarks that can
be used for cephalometric superimposition of the maxilla and the
mandible. A maxillary plane will then be determined for
superimposition of CBCT and tested in a clinical context. Methods:
The CBCTs of ten skulls were used to test the precision and
accuracy of the landmarks. Next, CBCTs and plaster models of thirty
patients were used to test and validate the proposed 3D
superimposition technique of the maxilla. Results: Nasion, incisive
foramen, bilateral infraorbital, mental foramina and anterior nasal
spine were all precise and accurate landmarks to use in the
formation of a maxillary superimposition plane. Comparison of the
proposed superimposition technique with a gold standard
demonstrated excellent agreement. Conclusion: The proposed
maxillary superimposition plane can be used as a regional
superimposition technique.
Subjects/Keywords: superimposition; cone beam computed tomography
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lemieux, G. (2014). Development of a Three Dimensional Maxillary Superimposition
Plane Using Cone Beam Computed Tomography. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/kh04dr22t
Chicago Manual of Style (16th Edition):
Lemieux, Genevieve. “Development of a Three Dimensional Maxillary Superimposition
Plane Using Cone Beam Computed Tomography.” 2014. Masters Thesis, University of Alberta. Accessed March 01, 2021.
https://era.library.ualberta.ca/files/kh04dr22t.
MLA Handbook (7th Edition):
Lemieux, Genevieve. “Development of a Three Dimensional Maxillary Superimposition
Plane Using Cone Beam Computed Tomography.” 2014. Web. 01 Mar 2021.
Vancouver:
Lemieux G. Development of a Three Dimensional Maxillary Superimposition
Plane Using Cone Beam Computed Tomography. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2021 Mar 01].
Available from: https://era.library.ualberta.ca/files/kh04dr22t.
Council of Science Editors:
Lemieux G. Development of a Three Dimensional Maxillary Superimposition
Plane Using Cone Beam Computed Tomography. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/kh04dr22t

Oregon State University
6.
Wongsason, Patcharee.
3D cone beam reconstruction formulas for the transverse-ray transform with source points on a curve.
Degree: PhD, Mathematics, 2014, Oregon State University
URL: http://hdl.handle.net/1957/51754
► 3D vector tomography has been explored and results have been achieved in the last few decades. Among these was a reconstruction formula for the solenoidal…
(more)
▼ 3D vector
tomography has been explored and results have been achieved in the last few decades. Among these was a reconstruction formula for the solenoidal part of a vector field from its Doppler transform with sources on a curve. The Doppler transform of a vector field is the line integral of the component parallel to the line. In this work, we shall study the transverse ray transform of a vector field, which instead integrates over lines the component of the vector field perpendicular to the line. We provide a reconstruction procedure for the transverse ray transform of a vector field with sources on a curve fulfilling Tuy’s condition of order 3. We shall recover both the potential and solenoidal parts. We present two steps for the reconstruction. The first one is to reconstruct the solenoidal part and the techniques we use are inspired by work of Katsevich and Schuster. A procedure for recovering the potential part will be the second step. The main ingredient is the difference between the measured data and the reprojection of the solenoidal part. We also provide a variation of the Radon inversion formula for the vector part of a quaternionic-valued function (or vector field) and an inversion formula in cone-beam setting with sources on the sphere.
Advisors/Committee Members: Finch, David V. (advisor), Solmon, Donald C. (committee member).
Subjects/Keywords: Spiral computed tomography – Mathematical models
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wongsason, P. (2014). 3D cone beam reconstruction formulas for the transverse-ray transform with source points on a curve. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/51754
Chicago Manual of Style (16th Edition):
Wongsason, Patcharee. “3D cone beam reconstruction formulas for the transverse-ray transform with source points on a curve.” 2014. Doctoral Dissertation, Oregon State University. Accessed March 01, 2021.
http://hdl.handle.net/1957/51754.
MLA Handbook (7th Edition):
Wongsason, Patcharee. “3D cone beam reconstruction formulas for the transverse-ray transform with source points on a curve.” 2014. Web. 01 Mar 2021.
Vancouver:
Wongsason P. 3D cone beam reconstruction formulas for the transverse-ray transform with source points on a curve. [Internet] [Doctoral dissertation]. Oregon State University; 2014. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/1957/51754.
Council of Science Editors:
Wongsason P. 3D cone beam reconstruction formulas for the transverse-ray transform with source points on a curve. [Doctoral Dissertation]. Oregon State University; 2014. Available from: http://hdl.handle.net/1957/51754

Anna University
7.
Padma A.
Certain investigations on texture Analysis techniques for
segmentation And classification of brain CT images;.
Degree: Certain investigations on texture Analysis techniques
for segmentation And classification of brain CT
images, 2015, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/33713
► Over the last thirty years there has been an explosion in our newlineknowledge of the biochemical machinery of the nervous system In the last few…
(more)
▼ Over the last thirty years there has been an
explosion in our newlineknowledge of the biochemical machinery of
the nervous system In the last few newlineyears with the advent of
new imaging technologies such as computed newlinetomography imaging
CT it has been possible to explore the anatomical and
newlinefunctional structure of the human brain The visualization of
the different tissues newlineand their analysis has opened up a new
dimension to the neuro anatomical and newlinefunctional disorders
that might exist within the human brain These advantages newlineof
these imaging modalities like CT and MRI Magnetic Resonance Imaging
newlinehas to offer will be fully exploited only through
intelligent interpretation of the newlinedata This has been the
major limitation in realizing the potential of the imaging
newlineThus the sophisticated and optimal analysis of the data is
the need of the hour in newlinethe field of neuro medicine
newlineComputed Tomography imaging is though expensive because of
newlinecapital costs is easy to perform because of its noninvasive
nature It is clearly newlinevery important to extract the maximum
possible information from any image newlineobtained However image
processing modes based on scan sections or newlineradiographic
views may not completely provide diagnostic information at an
newlineearly stage when it would be easier to control a disease
make a therapeutic newlinedecision or perform surger newline
newline
reference p164-172.
Advisors/Committee Members: Sukanesh R.
Subjects/Keywords: Computed Tomography; Magnetic Resonance Imaging
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
A, P. (2015). Certain investigations on texture Analysis techniques for
segmentation And classification of brain CT images;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/33713
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
A, Padma. “Certain investigations on texture Analysis techniques for
segmentation And classification of brain CT images;.” 2015. Thesis, Anna University. Accessed March 01, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/33713.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
A, Padma. “Certain investigations on texture Analysis techniques for
segmentation And classification of brain CT images;.” 2015. Web. 01 Mar 2021.
Vancouver:
A P. Certain investigations on texture Analysis techniques for
segmentation And classification of brain CT images;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Mar 01].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/33713.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
A P. Certain investigations on texture Analysis techniques for
segmentation And classification of brain CT images;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/33713
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University
8.
Lee, Chung-Hao.
PARAMETRIC STUDY OF FACTORS AFFECTING
CAPILLARY IMBIBITION IN FRACTURED POROUS MEDIA.
Degree: 2011, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/11694
► Capillarity, gravity and viscous forces control the fluids migration in geologic formations. However, experimental working addressing the simultaneous action of these driving forces as well…
(more)
▼ Capillarity, gravity and viscous forces control the fluids migration in geologic formations. However, experimental working addressing the simultaneous action of these driving forces as well as the impact of injection flow rate in fractured porous media is limited. Understanding how these variables affect fracture-matrix transfer mechanisms and invasion front evolution in fractured rocks are of crucial importance to modeling and prediction of multiphase ground flow. This study addresses the simultaneous influence of fracture orientation, rock and fluid properties, and flowing conditions on multiphase flow in fractured permeable media at laboratory scale. Displacement of a non-wetting phase (gas or liquid) by capillary imbibition was monitored using X-ray
computed tomography (CT). Results were then mimicked using an automated history matching approach to obtain representative relative permeability and capillary pressure curves to further investigate the impact of matrix homogeneity/heterogeneity and boundary shape on the response of the imbibition front. Sensitive analyses, in combination with direct experimental observation, allowed us to explore relative importance of relative permeability and capillary pressure curves to saturation distribution and imbibing font evolution.
Experimental observations combined with simulation results indicated the impact of fracture orientation on imbibition front evolution was minimal for the time- and length-scales considered in this investigation. While different injection rates and fluid types showed significant differences in the shape of the imbibing front, breakthrough time, and saturation profiles. The speed and shape of imbibing front progressions were found to be sensitive to matrix water relative permeability, capillary pressure contrast between matrix and fracture, and degree of rock heterogeneity. Results from this work also demonstrated conditions that favor co-current, counter-current, and the coexistence of both displacement mechanisms during imbibition. Co-current flow dominates in the case of water displacing air, while counter-current flow dominates in the case of water displacing
kerosene. The balance of capillarity and relative permeabilities has a significant impact of the shape on the invasion front, resulting in periods of co-current and counter-current imbibition. This work presents direct evidence of spontaneous migration of wetting fluids into a rock matrix embedding a fracture. These observations and conclusions are not limited by the geometry of the system and have important implication for water flooding of naturally fractured reservoir and leak-off retention and migration after hydraulic fracture treatments.
Advisors/Committee Members: Zuleima T Karpyn, Dissertation Advisor/Co-Advisor, Zuleima T Karpyn, Committee Chair/Co-Chair, Turgay Ertekin, Committee Member, Derek Elsworth, Committee Member, Yilin Wang, Committee Member, Kamini Singha, Committee Member.
Subjects/Keywords: Imbibition; Computed Tomography; Fractures; Capillarity
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lee, C. (2011). PARAMETRIC STUDY OF FACTORS AFFECTING
CAPILLARY IMBIBITION IN FRACTURED POROUS MEDIA. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/11694
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lee, Chung-Hao. “PARAMETRIC STUDY OF FACTORS AFFECTING
CAPILLARY IMBIBITION IN FRACTURED POROUS MEDIA.” 2011. Thesis, Penn State University. Accessed March 01, 2021.
https://submit-etda.libraries.psu.edu/catalog/11694.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lee, Chung-Hao. “PARAMETRIC STUDY OF FACTORS AFFECTING
CAPILLARY IMBIBITION IN FRACTURED POROUS MEDIA.” 2011. Web. 01 Mar 2021.
Vancouver:
Lee C. PARAMETRIC STUDY OF FACTORS AFFECTING
CAPILLARY IMBIBITION IN FRACTURED POROUS MEDIA. [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Mar 01].
Available from: https://submit-etda.libraries.psu.edu/catalog/11694.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lee C. PARAMETRIC STUDY OF FACTORS AFFECTING
CAPILLARY IMBIBITION IN FRACTURED POROUS MEDIA. [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/11694
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
9.
Ryuhei Katsui; Norihiro Samoto; Akira Taniguchi; Manabu Akahane; Shinji Isomoto; Kazuya Sugimoto; Yasuhito Tanaka.
Relationship Between Displacement and Degenerative Changes of the Sesamoids in Hallux Valgus. : 外反母祉における種子骨の偏位と関節症変化の関係.
Degree: 博士(医学), 2016, Nara Medical University / 奈良県立医科大学
URL: http://hdl.handle.net/10564/3283
► BACKGROUND: Although the tangential sesamoid view is used to visualize the sesamoid position relative to the first metatarsal head, correctly evaluating patients with severe varus…
(more)
▼ BACKGROUND: Although the tangential sesamoid view is used to visualize the sesamoid position relative to the first metatarsal head, correctly evaluating patients with severe varus of the first metatarsal is difficult. Computed tomography (CT) can be helpful due to its cross-sectional images in any plane. The purposes of this study were to evaluate the alignment of the tibial sesamoid and investigate the relationship between malalignment and degenerative change in the sesamoid metatarsal joint (SMJ) using simulated weight-bearing CT imaging in patients with hallux valgus. METHODS: In total, 269 feet from 142 patients with hallux valgus were included. The mean age was 63.7 years (range, 33-87 years). An anteroposterior weight-bearing radiograph was assessed for sesamoid position into 3 grades: grade 1, the tibial sesamoid was medial to the axis of the first metatarsal; grade 2, the tibial sesamoid was located below the first metatarsal axis; and grade 3, the tibial sesamoid was lateral to the first metatarsal axis. The hallux valgus and intermetatarsal angles (HVA and IMA, respectively) were measured. The lateral shift of the tibial sesamoid relative to the first metatarsal was classified into 3 grades on simulated weight-bearing CT classification: grade 1, tibial sesamoid was entirely medial to the intersesamoid ridge; grade 2, tibial sesamoid was subluxated laterally but located below the intersesamoid ridge; and grade 3, tibial sesamoid was located entirely lateral to the intersesamoid ridge. The differences of HVA and IMA in each grade were confirmed by using 1-way analysis of variance with Bonferroni post hoc corrections. Furthermore, multiple linear regression analysis was used to predict the degenerative change in the SMJ for age, sex, sesamoid position determined by CT or plain radiography, HVA, and IMA. The χ2 test was used for descriptive statistics to analyze the agreement between radiography or CT classifications of sesamoid position against degenerative change in the SMJ. RESULTS: Based on the radiographic classification of the tibial sesamoid position, 7 feet were classified as grade 1, 72 were grade 2, and 190 were grade 3, respectively. Based on the CT classification, 34 feet were classified as grade 1, 116 were grade 2, and 119 were grade 3. Degenerative change in SMJ progressed according to the sesamoid shift relative to the first metatarsal using either radiography or CT. In radiography, statistically significant differences were found except for the difference in HVA between grades 1 and 2. In addition, statistically significant differences were found between HVA and IMA, along with the grades in CT.In multiple linear regression, degenerative change was correlated with age and sesamoid position in CT and radiographic classifications. CONCLUSION: Our study showed that lateral shift of the tibial sesamoid increased in association with progression of the hallux valgus deformity. Furthermore, increasing lateral shift of the tibial sesamoid was associated with worsening degenerative change within the…
Subjects/Keywords: sesamoid; hallux valgus; computed tomography
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tanaka, R. K. N. S. A. T. M. A. S. I. K. S. Y. (2016). Relationship Between Displacement and Degenerative Changes of the Sesamoids in Hallux Valgus. : 外反母祉における種子骨の偏位と関節症変化の関係. (Thesis). Nara Medical University / 奈良県立医科大学. Retrieved from http://hdl.handle.net/10564/3283
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tanaka, Ryuhei Katsui; Norihiro Samoto; Akira Taniguchi; Manabu Akahane; Shinji Isomoto; Kazuya Sugimoto; Yasuhito. “Relationship Between Displacement and Degenerative Changes of the Sesamoids in Hallux Valgus. : 外反母祉における種子骨の偏位と関節症変化の関係.” 2016. Thesis, Nara Medical University / 奈良県立医科大学. Accessed March 01, 2021.
http://hdl.handle.net/10564/3283.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tanaka, Ryuhei Katsui; Norihiro Samoto; Akira Taniguchi; Manabu Akahane; Shinji Isomoto; Kazuya Sugimoto; Yasuhito. “Relationship Between Displacement and Degenerative Changes of the Sesamoids in Hallux Valgus. : 外反母祉における種子骨の偏位と関節症変化の関係.” 2016. Web. 01 Mar 2021.
Vancouver:
Tanaka RKNSATMASIKSY. Relationship Between Displacement and Degenerative Changes of the Sesamoids in Hallux Valgus. : 外反母祉における種子骨の偏位と関節症変化の関係. [Internet] [Thesis]. Nara Medical University / 奈良県立医科大学; 2016. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10564/3283.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tanaka RKNSATMASIKSY. Relationship Between Displacement and Degenerative Changes of the Sesamoids in Hallux Valgus. : 外反母祉における種子骨の偏位と関節症変化の関係. [Thesis]. Nara Medical University / 奈良県立医科大学; 2016. Available from: http://hdl.handle.net/10564/3283
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Edinburgh
10.
MacDonald, Alisdair John.
Assessment of muscle wasting.
Degree: Thesis (M.D.), 2015, University of Edinburgh
URL: http://hdl.handle.net/1842/16455
► Cachexia occurs commonly and is a significant cause of morbidity and up to 20% mortality in patients with cancer. Loss of muscle mass occurs as…
(more)
▼ Cachexia occurs commonly and is a significant cause of morbidity and up to 20% mortality in patients with cancer. Loss of muscle mass occurs as part of the cachexia wasting process and low muscle mass is a key element of the most recent consensus cachexia definition. Measuring muscle mass and changes in skeletal muscle is important to phenotype cachectic individuals and to monitor response to anti-cachectic treatments. This thesis investigates minimally invasive or burdensome methods of measuring muscle mass and muscle protein kinetics for use in a clinical or research setting. Quantification of muscle area on routine diagnostic cross-sectional imaging offers a novel and relatively non-invasive method of assessing both regional (and by extrapolation) whole body muscle mass. The need for such a direct measurement of muscle mass was demonstrated by showing that simple anthropometric formulae are unable to predict muscularity accurately (within 25%) when compared with estimates derived from patients diagnostic CT scans. It may be that qualitative changes in muscle may be more sensitive indices of the wasting process rather than qualitative change. Myosteatosis (infiltration of muscle by fat) is known to occur in both cachexia and age related sarcopenia and can be quantified using the Hounsfield spectrum observed on routine diagnostic CT scans. However, not all patients undergo routine CT scanning and there is a need for a biomarker derived from urine or blood. Consequently, cross sectional imaging was used to phenotype patients in a proteomic analysis of urine with the aim of identifying protein or peptide biomarkers associated with myosteatosis in cancer cachexia. A biomarker model for myosteatosis was developed with good sensitivity (97%) but poor specificity (71%). Many of the potential protein / peptide markers identified had poor associations with known mechanisms of muscle wasting and further study of the identified peptides in an extended cohort would help determine the validity of the present findings. However, two proteins with potential roles in muscle repair or neuromuscular function (Agarin and Cathepsin C) were identified and these may warrant targeted investigation with evaluation against sequential measures of muscle mass to determine their value in defining muscle loss over time. As different regional measures of muscularity are available, trunk (L3 CT) and limb muscle (quadriceps MRI) cross sectional measurements were compared with functional assessments to determine the optimal site for measurement. Neither measure proved superior to the other but appeared to reflect different aspects of function. Quadriceps muscle area correlated with quadriceps strength and power whilst truncal muscle area correlated more with complex movements such as the timed-up-and-go test. Changes in regional muscle area in patients with upper gastrointestinal cancer were assessed by upper and lower limb MRI before and after surgery and by L3 CT cross sectional area before and after neo-adjuvant chemotherapy. No change in limb…
Subjects/Keywords: 616.7; cachexia; computed tomography; sarcopenia
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
MacDonald, A. J. (2015). Assessment of muscle wasting. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/16455
Chicago Manual of Style (16th Edition):
MacDonald, Alisdair John. “Assessment of muscle wasting.” 2015. Doctoral Dissertation, University of Edinburgh. Accessed March 01, 2021.
http://hdl.handle.net/1842/16455.
MLA Handbook (7th Edition):
MacDonald, Alisdair John. “Assessment of muscle wasting.” 2015. Web. 01 Mar 2021.
Vancouver:
MacDonald AJ. Assessment of muscle wasting. [Internet] [Doctoral dissertation]. University of Edinburgh; 2015. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/1842/16455.
Council of Science Editors:
MacDonald AJ. Assessment of muscle wasting. [Doctoral Dissertation]. University of Edinburgh; 2015. Available from: http://hdl.handle.net/1842/16455

Virginia Tech
11.
Hand, Davis Kyle.
A Manufacturing Process for Single Micron Resolution Optical Gratings Used in X-ray Computed Tomography.
Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/33804
► X-ray Computed Tomography (CT) is a process that produces three-dimensional x-ray images, allowing for better diagnosis and analysis of complex internal medical conditions. New advances…
(more)
▼ X-ray
Computed Tomography (CT) is a process that produces three-dimensional
x-ray images, allowing for better diagnosis and analysis of complex internal medical
conditions. New advances in the optical techniques used in this process promise to
produce better results while reducing patient risk. One of these developments calls for
precise optical gratings that can be expensive and difficult to manufacture. This paper
presents a simple process developed specifically for the production of these gratings
using cost effective techniques. The process uses well understood semiconductor
fabrication steps including oxidation, deep reactive ion etching and electroplating. While
not entirely successful, the process presented within provides a proof of concept for
development of the gratings and discusses improvements that could be made to allow for
success.
Advisors/Committee Members: Meehan, Kathleen (committeechair), Wyatt, Christopher L. (committee member), Orlowski, Marius (committee member).
Subjects/Keywords: Computed Tomography; Photolithography; Electroplating; DRIE
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hand, D. K. (2011). A Manufacturing Process for Single Micron Resolution Optical Gratings Used in X-ray Computed Tomography. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33804
Chicago Manual of Style (16th Edition):
Hand, Davis Kyle. “A Manufacturing Process for Single Micron Resolution Optical Gratings Used in X-ray Computed Tomography.” 2011. Masters Thesis, Virginia Tech. Accessed March 01, 2021.
http://hdl.handle.net/10919/33804.
MLA Handbook (7th Edition):
Hand, Davis Kyle. “A Manufacturing Process for Single Micron Resolution Optical Gratings Used in X-ray Computed Tomography.” 2011. Web. 01 Mar 2021.
Vancouver:
Hand DK. A Manufacturing Process for Single Micron Resolution Optical Gratings Used in X-ray Computed Tomography. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10919/33804.
Council of Science Editors:
Hand DK. A Manufacturing Process for Single Micron Resolution Optical Gratings Used in X-ray Computed Tomography. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/33804

University of Sydney
12.
Ayoub, Chadi.
Evaluation Of Semi-Quantitative Measures Of Coronary Atherosclerosis Burden By Computed Tomography Angiography
.
Degree: 2019, University of Sydney
URL: http://hdl.handle.net/2123/20985
► CAD is a leading cause of morbidity and death. Coronary computed tomography angiography (CCTA) is an anatomic, non-invasive imaging technique that can diagnose and risk…
(more)
▼ CAD is a leading cause of morbidity and death. Coronary computed tomography angiography (CCTA) is an anatomic, non-invasive imaging technique that can diagnose and risk stratify CAD, without the risks associated with invasive coronary angiography, the gold standard. This research first carried out a review of the literature to appraise current clinical applications of CCTA, its prognostic power and future directions in terms of advances. The segment involvement score (SIS), also termed the total plaque score (TPS), is a semi-quantitative score that gives an indication of coronary disease burden, and is consistent with the move from qualitative to quantitative CCTA reporting. Although SIS is often reported in scientific studies, it is not reported routinely in clinical CCTA studies. This research in sequential phases sought to first define the prognostic value of SIS by systemic review and meta-analysis of published literature. In addition to atherosclerosis burden, atherosclerotic progression has been advocated as a superior predictor of outcomes. Hence the novel measure ‘age adjusted SIS’ (aSIS) was devised. It was hypothesised that aSIS is a surrogate marker of ‘vascular age’, as it gives greater weighting to segments involved in those who are younger, and so may account for premature atherosclerotic disease. Evaluation of aSIS first in a hypothesis-generating study, and then with external validation in a large multinational registry, demonstrated that it has independent, incremental prognostic value to traditional risk factors and CCTA measures of CAD. In a subanalysis to compare directly to the well-established coronary artery calcium (CAC) score, aSIS also showed incremental prognostic value, but has the benefit of not needing additional concomitant scanning as CAC score requires. In the final phase of this research, aSIS was applied with other CCTA measures to evaluate CAD in French Canadians, a suggested vulnerable population with increased risk for premature coronary artery disease and clinical events. Taken together, this research supports the inclusion of SIS in routine clinical CCTA reports. The simplicity of SIS and aSIS makes them easily calculable on a routine basis for clinical reports of CCTA, and they have potential to be calculated by automated software algorithms.
Subjects/Keywords: Coronary;
Atherosclerosis;
Computed Tomography
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ayoub, C. (2019). Evaluation Of Semi-Quantitative Measures Of Coronary Atherosclerosis Burden By Computed Tomography Angiography
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/20985
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ayoub, Chadi. “Evaluation Of Semi-Quantitative Measures Of Coronary Atherosclerosis Burden By Computed Tomography Angiography
.” 2019. Thesis, University of Sydney. Accessed March 01, 2021.
http://hdl.handle.net/2123/20985.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ayoub, Chadi. “Evaluation Of Semi-Quantitative Measures Of Coronary Atherosclerosis Burden By Computed Tomography Angiography
.” 2019. Web. 01 Mar 2021.
Vancouver:
Ayoub C. Evaluation Of Semi-Quantitative Measures Of Coronary Atherosclerosis Burden By Computed Tomography Angiography
. [Internet] [Thesis]. University of Sydney; 2019. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/2123/20985.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ayoub C. Evaluation Of Semi-Quantitative Measures Of Coronary Atherosclerosis Burden By Computed Tomography Angiography
. [Thesis]. University of Sydney; 2019. Available from: http://hdl.handle.net/2123/20985
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Sydney
13.
Gnalini, Sathananthan.
Understanding The Relationship Between The Electrical And Anatomical Axis Of The Heart
.
Degree: 2019, University of Sydney
URL: http://hdl.handle.net/2123/21288
► Our study sought to examine the relationship between the true anatomical cardiac axis and the electrical cardiac axis of the heart. We examined these two…
(more)
▼ Our study sought to examine the relationship between the true anatomical cardiac axis and the electrical cardiac axis of the heart. We examined these two axes in healthy middle aged controls, without structural heart disease. We then compared this with aged matched obese individuals and older individuals. We found a mean anatomical axis 38.1° ± 7.8° on cardiac computed tomography (CT) and a mean electrocardiogram (ECG) axis of 51.8° ± 26.6° in the control group, pearson r value 0.12 (p=0.365). In the obese age matched group, the mean anatomical axis was 25.1° ± 6.2° with a mean ECG axis of 20.1° ± 23.9°, pearson r value 0.05 (p=0.808). In the older group, the mean anatomical axis was 34.4° ± 9.1° with a mean ECG axis of 34.4° ± 30.3°, pearson r value 0.26 (p=0.209). Our results found that obese individuals have a more leftward rotation of both axes compared with age matched normals (p< 0.0001). The leftward rotation in the anatomical axis may be secondary to elevation of the diaphragm. The leftward rotation of the electrical axis in the obese population however is not well explained. Abnormal adipose deposition within the heart may result in subclinical conduction disease in this patient group. Older individuals had a more leftward rotation of their electrical cardiac axis only (p=0.01), which may be a normal variant or may reflect underlying subclinical conduction disturbances, which is not uncommon in this age group. The study also found that there was no correlation between the CT and ECG axis in any of the groups with a correlation coefficient of 0.12, 0.05 and 0.26 in the control, obese and older group respectively. There appears to be no simple relationship between these two axes in any of the groups studied. Although the anatomical cardiac axis may and probably does influence the electrical cardiac axis, there does not appear to be a simple measure of how this occurs. Our study recommends these two axes not be used interchangeably as they are independent measures of two very different things.
Subjects/Keywords: electrocardiogram;
computed tomography;
cardiac axis
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gnalini, S. (2019). Understanding The Relationship Between The Electrical And Anatomical Axis Of The Heart
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/21288
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gnalini, Sathananthan. “Understanding The Relationship Between The Electrical And Anatomical Axis Of The Heart
.” 2019. Thesis, University of Sydney. Accessed March 01, 2021.
http://hdl.handle.net/2123/21288.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gnalini, Sathananthan. “Understanding The Relationship Between The Electrical And Anatomical Axis Of The Heart
.” 2019. Web. 01 Mar 2021.
Vancouver:
Gnalini S. Understanding The Relationship Between The Electrical And Anatomical Axis Of The Heart
. [Internet] [Thesis]. University of Sydney; 2019. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/2123/21288.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gnalini S. Understanding The Relationship Between The Electrical And Anatomical Axis Of The Heart
. [Thesis]. University of Sydney; 2019. Available from: http://hdl.handle.net/2123/21288
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech
14.
Saulnier, Diane Christine.
Imaging of the Canine Heart Using Non ECG-Gated and ECG-Gated 64 Multidetector Computed Tomography.
Degree: MS, Biomedical and Veterinary Sciences, 2012, Virginia Tech
URL: http://hdl.handle.net/10919/34046
► ECG-gated multidetector computed tomography (MDCT) is an imaging modality widely utilized for the evaluation of cardiac pathology by physicians. However, there has been little research…
(more)
▼ ECG-gated multidetector
computed tomography (MDCT) is an imaging modality widely utilized for the evaluation of cardiac pathology by physicians. However, there has been little research of cardiac MDCT imaging in veterinary patients. Presently, ECG-gating is an upgrade for MDCT, which few veterinary institutions currently possess. The purpose of this study was to compare image quality between a 16 non ECG-gated and 64 ECG-gated MDCT for clinically important cardiac anatomy in dogs. In a crossover trial, six dogs were scanned using 16 non ECG-gated and 64 ECG-gated MDCT. A standardized anesthetic protocol, designed to induce bradycardia (mean HR 45 bpm ± 12.6) was used. Five post-contrast sequential scans through the heart were performed for each patient when utilizing the 16 non ECG-gated MDCT, in attempt to obtain a motion free series of images of the heart. For each scan, assessment of cardiac morphology was performed by evaluating a group of 21 cardiac structures, using a 3-point scale. Each of the images were scored as 0 (motion present, scan non-diagnostic), 1 (motion present, scan diagnostic), and 2 (no motion, therefore diagnostic scan of high quality). Quality scores (QS) from all scans within a dog (30 scans total) were assigned for each cardiac structure. QS from the six ECG-gated MDCT scans were of high diagnostic quality, generating diagnostic images for all of the 21 cardiac structures evaluated for each of the 6 scans. Individual non ECG-gated scans were of variable quality, primarily generating QS of 1 or 2. A complete set of diagnostic images for all 21 structures was not achieved from an individual scan. Minimum number of non ECG-gated scans to identify a single structure was calculated, and ranged from 1-2 scans for all structures. Cumulative number of sequential non ECG-gated scans needed to achieve images of all cardiac structures was calculated and determined to be 5. A 16 non ECG-gated MDCT scanner can produce cardiac images that are similar in quality, to those of 64 ECG-gated MDCT. Cardiac motion negatively impacts image quality in studies acquired without ECG-gating. However, this can be overcome by performing multiple sequential scans through the heart.
Advisors/Committee Members: Daniel, Gregory B. (committeechair), Pereira, Carolina Ricco (committee member), Tyson, Reid (committee member).
Subjects/Keywords: MDCT; Computed tomography; Cardiac; Canine
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Saulnier, D. C. (2012). Imaging of the Canine Heart Using Non ECG-Gated and ECG-Gated 64 Multidetector Computed Tomography. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/34046
Chicago Manual of Style (16th Edition):
Saulnier, Diane Christine. “Imaging of the Canine Heart Using Non ECG-Gated and ECG-Gated 64 Multidetector Computed Tomography.” 2012. Masters Thesis, Virginia Tech. Accessed March 01, 2021.
http://hdl.handle.net/10919/34046.
MLA Handbook (7th Edition):
Saulnier, Diane Christine. “Imaging of the Canine Heart Using Non ECG-Gated and ECG-Gated 64 Multidetector Computed Tomography.” 2012. Web. 01 Mar 2021.
Vancouver:
Saulnier DC. Imaging of the Canine Heart Using Non ECG-Gated and ECG-Gated 64 Multidetector Computed Tomography. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10919/34046.
Council of Science Editors:
Saulnier DC. Imaging of the Canine Heart Using Non ECG-Gated and ECG-Gated 64 Multidetector Computed Tomography. [Masters Thesis]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/34046

Baylor University
15.
Stenson, John P., 1993-.
Chord length methods for Proton Computed Tomography.
Degree: M.S.B.M.E., Baylor University. Dept. of School of Engineering., 2017, Baylor University
URL: http://hdl.handle.net/2104/10177
► Proton Computed Tomography (also known as pCT) is an emerging medical imaging method. The three dimensional images reconstructed from pCT scans provide information about the…
(more)
▼ Proton
Computed Tomography (also known as pCT) is an emerging medical imaging method. The three dimensional images reconstructed from pCT scans provide information about the Relative Stopping Power of the object scanned. Proton and ion therapies can administer radiation with higher conformity than traditional photon therapies. The RSP values provided by pCT scans are particularly useful when planning proton and ion related therapies. pCT reconstructions depend on solving the linear system of equations represented by Ax=b. It is necessary to accurately construct the matrix A by determining its elements. Which elements in A are non-zero is determined by Most Likely Path methods. The values of these non-zero elements are known as chord lengths. This work investigates different methods for determining chord length, and the effect they have on pCT reconstructions.
Advisors/Committee Members: Schubert, Keith Evan. (advisor).
Subjects/Keywords: Proton Computed Tomography. Protons. Computed Tomography chord length. Reconstruction techniques.
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Stenson, John P., 1. (2017). Chord length methods for Proton Computed Tomography. (Masters Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/10177
Chicago Manual of Style (16th Edition):
Stenson, John P., 1993-. “Chord length methods for Proton Computed Tomography.” 2017. Masters Thesis, Baylor University. Accessed March 01, 2021.
http://hdl.handle.net/2104/10177.
MLA Handbook (7th Edition):
Stenson, John P., 1993-. “Chord length methods for Proton Computed Tomography.” 2017. Web. 01 Mar 2021.
Vancouver:
Stenson, John P. 1. Chord length methods for Proton Computed Tomography. [Internet] [Masters thesis]. Baylor University; 2017. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/2104/10177.
Council of Science Editors:
Stenson, John P. 1. Chord length methods for Proton Computed Tomography. [Masters Thesis]. Baylor University; 2017. Available from: http://hdl.handle.net/2104/10177

University of Notre Dame
16.
Tyler E. Curtis.
Material Decomposition Using Photon-Counting Spectral
Computed Tomography</h1>.
Degree: Bioengineering, 2019, University of Notre Dame
URL: https://curate.nd.edu/show/cf95j96359f
► Clinical and preclinical X-ray computed tomography (CT) provides three-dimensional anatomic imaging at high spatial and temporal resolution. However, quantitative molecular imaging is not possible…
(more)
▼ Clinical and preclinical X-ray
computed
tomography (CT) provides three-dimensional anatomic imaging at high
spatial and temporal resolution. However, quantitative molecular
imaging is not possible in conventional CT due to similarity in the
overall X-ray attenuation across the polychromatic X‑ray photon
energy spectrum and the use of energy integrating detectors.
However, recent developments in photon-counting detectors have led
to the development of prototype photon-counting spectral CT systems
that can acquire images at multiple energy levels which, when used
in conjunction with material decomposition algorithms, can identify
and quantify contrast agent and tissue compositions. Thus,
photon-counting spectral CT can provide simultaneous anatomic and
quantitative molecular imaging. However, the development of these
capabilities and their application remains nascent due to a limited
availability of imaging systems. Therefore, the overall objective
of this dissertation was to investigate quantitative material
decomposition of multiple, discrete or spatially coincident,
contrast agent and tissue compositions using a prototype
preclinical photon-counting spectral CT system.
Methods were developed for material decomposition using
constrained maximum likelihood estimation (MLE) in the imaging
domain and calibrated using multiple linear regression models of
known material concentrations. The median root mean squared error
(RMSE) for material decomposition of a single gadolinium contrast
agent was as low as ~1.5 mM (~0.24 mg/mL gadolinium), similar in
magnitude to that measured by optical spectroscopy. Material
decomposition of multiple discrete contrast agent and tissue
compositions was subsequently demonstrated in several models.
Multiple discrete contrast agent compositions were able to be
simultaneously evaluated with quantitative accuracy (RMSE) that was
comparable to results for a single contrast agent and were able to
be identified even against highly attenuating bone tissue.
Image-based material decomposition was also able to identify
contrast agents within murine models at an image acquisition time
suitable for in vivo preclinical imaging.
Multiple mixed, or spatially coincident, contrast agent (gadolinium
and iodine) and tissue (calcium and water) compositions were
identified and quantified with high accuracy (area under the
receiver operating characteristic curve (AUC) > 0.8, RMSE
< 12%). Finally, the methods used for mixed component
material decomposition were further developed to allow elemental
decomposition of Ca, P and O, which enabled discrimination of
pathologically-relevant microcalcifications (hydroxyapatite versus
calcium oxalate, AUC > 0.8) at a clinically-relevant size
(maximum dimension < 1 mm). Thus, photon-counting spectral
CT enabled quantitative molecular imaging of multiple, spatially
coincident contrast agent and tissue compositions, which is not
possible with current clinical molecular imaging modalities
Advisors/Committee Members: Ryan K. Roeder, Research Director.
Subjects/Keywords: Photon-Counting Computed Tomography; Material Decomposition; Spectral Computed Tomography
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Curtis, T. E. (2019). Material Decomposition Using Photon-Counting Spectral
Computed Tomography</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/cf95j96359f
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Curtis, Tyler E.. “Material Decomposition Using Photon-Counting Spectral
Computed Tomography</h1>.” 2019. Thesis, University of Notre Dame. Accessed March 01, 2021.
https://curate.nd.edu/show/cf95j96359f.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Curtis, Tyler E.. “Material Decomposition Using Photon-Counting Spectral
Computed Tomography</h1>.” 2019. Web. 01 Mar 2021.
Vancouver:
Curtis TE. Material Decomposition Using Photon-Counting Spectral
Computed Tomography</h1>. [Internet] [Thesis]. University of Notre Dame; 2019. [cited 2021 Mar 01].
Available from: https://curate.nd.edu/show/cf95j96359f.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Curtis TE. Material Decomposition Using Photon-Counting Spectral
Computed Tomography</h1>. [Thesis]. University of Notre Dame; 2019. Available from: https://curate.nd.edu/show/cf95j96359f
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universiteit Utrecht
17.
Contini, E.
Rib cage segmentation in CT scans.
Degree: 2014, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/297248
► The need for reliable segmentations of rib cages in 3D images like CT or MRI is a first importance problem in the field of medical…
(more)
▼ The need for reliable segmentations of rib cages in 3D images like CT or MRI is a first importance problem in the field of medical imaging. This task is still an open challenge for a number of reasons: ribs may have no clear boundaries; some rib or parts of ribs may be missing, and scans obtained in clinical practice often contain pathologies like scoliosis, that cause complex deformations of the rib cage including rotation and distortions.
This literature study aims to give a critical review of the methods currently used for segmenting the rib cage. The methods investigated were taken from fifteen research works on CT scans published from 1999 to 2013. Each method is accurately analyzed, highlighting its strong and weak points in comparison with the other methods, indicating its suitability for clinical usage and possible improvements.
Advisors/Committee Members: Noorda, Y., Pluim, Dr J..
Subjects/Keywords: Ribs; segmentation; X-ray computed tomography
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APA (6th Edition):
Contini, E. (2014). Rib cage segmentation in CT scans. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/297248
Chicago Manual of Style (16th Edition):
Contini, E. “Rib cage segmentation in CT scans.” 2014. Masters Thesis, Universiteit Utrecht. Accessed March 01, 2021.
http://dspace.library.uu.nl:8080/handle/1874/297248.
MLA Handbook (7th Edition):
Contini, E. “Rib cage segmentation in CT scans.” 2014. Web. 01 Mar 2021.
Vancouver:
Contini E. Rib cage segmentation in CT scans. [Internet] [Masters thesis]. Universiteit Utrecht; 2014. [cited 2021 Mar 01].
Available from: http://dspace.library.uu.nl:8080/handle/1874/297248.
Council of Science Editors:
Contini E. Rib cage segmentation in CT scans. [Masters Thesis]. Universiteit Utrecht; 2014. Available from: http://dspace.library.uu.nl:8080/handle/1874/297248
18.
Willemink, M.J.
Iterative Reconstruction for Cardiopulmonary Computed Tomography.
Degree: 2015, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/313071
► Introduction The number of computed tomography (CT) examinations has increased rapidly since CT became commercially available. This resulted in growing concerns regarding the risk of…
(more)
▼ Introduction
The number of
computed tomography (CT) examinations has increased rapidly since CT became commercially available. This resulted in growing concerns regarding the risk of malignancies induced by application of medical ionizing radiation. Therefore, radiation dose reduction strategies are needed and being developed. This is especially important for patients who get many CT scans (e.g. chest CT for follow up of lung nodules), CT scans with high radiation doses (e.g. scans of the heart) and for children who are more sensitive to radiation.
A recent dose reduction strategy focuses on optimization of image reconstruction. With current reconstruction methods, radiation dose reduction results in noisy images, which are susceptible to artefacts. Iterative reconstruction (IR) is an alternative image reconstruction method that allows for image quality improvement at similar radiation dose or imaging at lower radiation dose without compromising image quality compared to current methods. Improved computational power of CT reconstruction workstations has permitted the recent introduction of IR for CT.
Purpose
The aim of this thesis was to evaluate both potential applications of IR: improving image quality and reducing radiation dose of CT scans of the heart and the lungs. First, in-vitro and ex-vivo preclinical research was performed to globally assess the potentials of IR for both applications. Second, image acquisition of cardiopulmonary CT examinations was optimized in-vivo with IR. Finally, IR was applied to reduce the radiation dose in the clinical setting and explore novel indications for CT.
Results
With the current thesis, we showed that IR can be used to improve image quality in routine dose CT, to reduce the radiation dose without loss of image quality, or with a combination of both strategies. We conclude that radiation doses for CCTA, calcium scoring CT, contrast-enhanced chest CT and plain chest CT can be reduced substantially by using IR.
For calcium scoring CT scans of the heart, we first performed a phantom study, then an ex-vivo study and finally a pilot study in 30 individuals evaluating the maximally achievable radiation dose reduction. Based on these studies we found a potential radiation dose reduction of 80%.
Reducing the radiation dose of CT imaging also allows for broadening the diagnostic value of CT scans of the lungs. If the radiation dose issue would be resolved, CT imaging could replace plain radiography for certain indications to reduce misdiagnosis.
Conclusion
Radiation doses for CT scans of the heart and the lungs can be reduced substantially by using IR.
Advisors/Committee Members: Leiner, T., Jong, P.A. de, Budde, R.P.J..
Subjects/Keywords: Medicine; Radiology; Computed tomography; Radiation; Cardiovascular; Chest
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Willemink, M. J. (2015). Iterative Reconstruction for Cardiopulmonary Computed Tomography. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/313071
Chicago Manual of Style (16th Edition):
Willemink, M J. “Iterative Reconstruction for Cardiopulmonary Computed Tomography.” 2015. Doctoral Dissertation, Universiteit Utrecht. Accessed March 01, 2021.
http://dspace.library.uu.nl:8080/handle/1874/313071.
MLA Handbook (7th Edition):
Willemink, M J. “Iterative Reconstruction for Cardiopulmonary Computed Tomography.” 2015. Web. 01 Mar 2021.
Vancouver:
Willemink MJ. Iterative Reconstruction for Cardiopulmonary Computed Tomography. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2015. [cited 2021 Mar 01].
Available from: http://dspace.library.uu.nl:8080/handle/1874/313071.
Council of Science Editors:
Willemink MJ. Iterative Reconstruction for Cardiopulmonary Computed Tomography. [Doctoral Dissertation]. Universiteit Utrecht; 2015. Available from: http://dspace.library.uu.nl:8080/handle/1874/313071

University of Ghana
19.
Sackey, T.A.
Cancer Risk Assessment of Patients Undergoing Computed Tomography Examination at the Korle-Bu Teaching Hospital (KBTH)
.
Degree: 2015, University of Ghana
URL: http://ugspace.ug.edu.gh/handle/123456789/22588
► The aim of this study is to estimate the effective dose and assess the lifetime attributable risk of cancer incidence of patients undergoing computed tomography…
(more)
▼ The aim of this study is to estimate the effective dose and assess the lifetime attributable risk of cancer incidence of patients undergoing computed tomography scan at the Korle-Bu Teaching Hospital. Data on Volume CT Dose Index () and Dose Length Product () displayed on the scanner control console was recorded after confirmation of the results by performing independent checks on a phantom. The effective doses were estimated using the displayed and the anatomic region specific conversion factors (). The average effective dose for the head, abdomen, chest, neck, and pelvis were 3.63± 2.39mSv, 15.37±8.49 mSv, 12.72 ± 13.97 mSv, 4.04 ± 1.47 mSv and 15.8 ± 3.59 mSv respectively. Effective doses for the head and neck were within the typical range of (1-10mSv) for CT examinations whilst abdomen, chest and pelvis were above 10mSv. The average life attributable risk of cancer incidence for each region of examination were determined from the effective dose, sex and age using the model proposed in BEIR VII Report . The average cancer risk incidence for head, neck, chest, abdomen and pelvis examinations were low in the range 1 in 10,000 to 1 in 1,000. There were wide variations in the effective dose values obtained for the same region under examination. This trend calls for the optimization of CT examination protocols to be established to ensure that patient doses are as low as reasonably achievable, economic and social factors being taken into account.
Subjects/Keywords: Cancer;
Computed Tomography Examination;
Dosage;
Ghana
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Sackey, T. A. (2015). Cancer Risk Assessment of Patients Undergoing Computed Tomography Examination at the Korle-Bu Teaching Hospital (KBTH)
. (Masters Thesis). University of Ghana. Retrieved from http://ugspace.ug.edu.gh/handle/123456789/22588
Chicago Manual of Style (16th Edition):
Sackey, T A. “Cancer Risk Assessment of Patients Undergoing Computed Tomography Examination at the Korle-Bu Teaching Hospital (KBTH)
.” 2015. Masters Thesis, University of Ghana. Accessed March 01, 2021.
http://ugspace.ug.edu.gh/handle/123456789/22588.
MLA Handbook (7th Edition):
Sackey, T A. “Cancer Risk Assessment of Patients Undergoing Computed Tomography Examination at the Korle-Bu Teaching Hospital (KBTH)
.” 2015. Web. 01 Mar 2021.
Vancouver:
Sackey TA. Cancer Risk Assessment of Patients Undergoing Computed Tomography Examination at the Korle-Bu Teaching Hospital (KBTH)
. [Internet] [Masters thesis]. University of Ghana; 2015. [cited 2021 Mar 01].
Available from: http://ugspace.ug.edu.gh/handle/123456789/22588.
Council of Science Editors:
Sackey TA. Cancer Risk Assessment of Patients Undergoing Computed Tomography Examination at the Korle-Bu Teaching Hospital (KBTH)
. [Masters Thesis]. University of Ghana; 2015. Available from: http://ugspace.ug.edu.gh/handle/123456789/22588

Rochester Institute of Technology
20.
Kuhfahl, Meagan.
Emulating the volume of pulminary nodules: A Quantitative approach.
Degree: School of Mathematical Sciences (COS), 2012, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/4974
► Doubling time for small pulmonary nodules is an important indicator used to diagnose lung cancer, a leading cause of death in the United States. The…
(more)
▼ Doubling time for small pulmonary nodules is an important indicator used to diagnose lung cancer, a leading cause of death in the United States. The volume of the nodules is measured using
computed tomography (CT) scans. Each volume measurement comes with a degree of uncertainty, which in turn increases the uncertainty for the doubling time measurement. Decisions regarding risky and expensive patient treatment depend on doubling time, so accuracy is important. The volume of nodules is estimated by taking a series of points marked on CT scans by radiologists and connecting these points to make a boundary. This boundary includes whole and partial pixels. By including and excluding partially filled pixels, the estimation errors can be quantified to ensure that a more accurate error estimation is made, allowing clinicians to make a better informed treatment decision. Since this process requires a radiologist to manually mark CT scans, there is a possibility for variation between radiologists, and it is time-consuming. A semi-automated method would be useful for measuring volume because it would reduce variation from radiologists' opinions and time. We can use Gaussian weighted integration to eliminate the need for radiologists to mark points on a scan. Instead, Gaussian weighted integration requires only a square boundary centered at the nodule. A Gaussian mask is applied and volume estimations are made. By simulating two scans per patient, the accuracy of each method is measured by statistical comparison with the original volume calculations, or the ground truth.
Advisors/Committee Members: Cahil, Nathan.
Subjects/Keywords: Computed tomography; Gaussian weighted integration; Pulmonary nodules
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Chicago ·
MLA ·
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CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Kuhfahl, M. (2012). Emulating the volume of pulminary nodules: A Quantitative approach. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/4974
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kuhfahl, Meagan. “Emulating the volume of pulminary nodules: A Quantitative approach.” 2012. Thesis, Rochester Institute of Technology. Accessed March 01, 2021.
https://scholarworks.rit.edu/theses/4974.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kuhfahl, Meagan. “Emulating the volume of pulminary nodules: A Quantitative approach.” 2012. Web. 01 Mar 2021.
Vancouver:
Kuhfahl M. Emulating the volume of pulminary nodules: A Quantitative approach. [Internet] [Thesis]. Rochester Institute of Technology; 2012. [cited 2021 Mar 01].
Available from: https://scholarworks.rit.edu/theses/4974.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kuhfahl M. Emulating the volume of pulminary nodules: A Quantitative approach. [Thesis]. Rochester Institute of Technology; 2012. Available from: https://scholarworks.rit.edu/theses/4974
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta
21.
Dietrich, Nicholas H.
Voxel-Based Iterative Registration Method using Phase
Correlations for Three-Dimensional Cone-Beam Computed Tomography
Acquired Images.
Degree: MS, Department of Mechanical Engineering Medical
Sciences-Orthodontics, 2016, University of Alberta
URL: https://era.library.ualberta.ca/files/c8w32r5749
► In orthodontics superimposition is an important technique allowing for accurate diagnosis and treatment planning. Lower radiation, three-dimensional, cone-beam computed tomography allows for acquisition of three-dimensional…
(more)
▼ In orthodontics superimposition is an important
technique allowing for accurate diagnosis and treatment planning.
Lower radiation, three-dimensional, cone-beam computed tomography
allows for acquisition of three-dimensional patient scans. New
superimposition methods are used compared to the traditional
methods used for two-dimensional scans. A new superimposition
method is designed in this thesis. A review of the current methods
of superimposition used in orthodontics was performed. The review
found that voxel-based, surface-based, and point-based
superimposition methods are used. The most commonly used
superimposition method is maximization of mutual information. A
cone-beam computed tomography machine is tested to find any
inherent machine properties that may influence superimposition. The
testing found that cone-beam computed tomography preserves and
allows for highly accurate linear measurements. When greyscale
values are viewed on a global scale there is not much change
between scans. An issue arises when greyscale values are only
viewed and compared between scans for a very small region of
interest. Voxel-based superimposition methods must ensure they use
a large enough region for the superimposition. A full mathematical
proof is contained within this thesis, outlining the techniques
used in the superimposition method as well as the method itself.
This includes proofs of the relevant techniques used, such as shift
invariance for Fourier transform or finding the shift between two
images using phase correlation. The algorithm works by taking two
three-dimensional images and converting them to the frequency
domain using Fourier transforms. The Fourier transform removes the
translation differences between the two images while preserving any
differences due to rotation. The rotational changes are then
converted to translations using a coordinate transform from
Cartesian to cylindrical coordinates. The translational difference
between the two volumes is found using phase correlation. This
corresponds to a rotational shift between the two images about a
single axis that can then be corrected. The entire process is then
iterated through to correct for all rotational differences between
the images. A final phase correlation allows for correction of all
translations to fully register two images. A simple validation is
included. The algorithm is tested against patient scans. This is
done in two manners, finding the registrations ability to register
scans with known error, and registering time one and time two scans
of real patient data with unknown initial error between the scans.
The algorithm is also compared to the 6 point superimposition
method found in literature. The new registration algorithm had
comparable, or superior, accuracy in 4 out of 10 tests. The new
algorithm had a 57% faster runtime compared to the six point
method. The new registration algorithm required less user
involvement than the six point method, only requiring a rough
selection of the cranial base for each patient scan versus
measuring multiple…
Subjects/Keywords: Registration; Cone-Beam Computed Tomography; CBCT
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dietrich, N. H. (2016). Voxel-Based Iterative Registration Method using Phase
Correlations for Three-Dimensional Cone-Beam Computed Tomography
Acquired Images. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/c8w32r5749
Chicago Manual of Style (16th Edition):
Dietrich, Nicholas H. “Voxel-Based Iterative Registration Method using Phase
Correlations for Three-Dimensional Cone-Beam Computed Tomography
Acquired Images.” 2016. Masters Thesis, University of Alberta. Accessed March 01, 2021.
https://era.library.ualberta.ca/files/c8w32r5749.
MLA Handbook (7th Edition):
Dietrich, Nicholas H. “Voxel-Based Iterative Registration Method using Phase
Correlations for Three-Dimensional Cone-Beam Computed Tomography
Acquired Images.” 2016. Web. 01 Mar 2021.
Vancouver:
Dietrich NH. Voxel-Based Iterative Registration Method using Phase
Correlations for Three-Dimensional Cone-Beam Computed Tomography
Acquired Images. [Internet] [Masters thesis]. University of Alberta; 2016. [cited 2021 Mar 01].
Available from: https://era.library.ualberta.ca/files/c8w32r5749.
Council of Science Editors:
Dietrich NH. Voxel-Based Iterative Registration Method using Phase
Correlations for Three-Dimensional Cone-Beam Computed Tomography
Acquired Images. [Masters Thesis]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/c8w32r5749

Cornell University
22.
Fotin, Sergey.
Computer-Aided Detection Of Pulmonary Nodules From Ct Scans.
Degree: PhD, Electrical Engineering, 2011, Cornell University
URL: http://hdl.handle.net/1813/33630
► Lung cancer is the leading cause of cancer related death in the world. Computed tomography (CT), which can provide detailed images of lung structure, makes…
(more)
▼ Lung cancer is the leading cause of cancer related death in the world.
Computed tomography (CT), which can provide detailed images of lung structure, makes it possible to detect lung cancer in its early stage. Regular clinical practice involves visual inspection of hundreds cross-sectional slices of a patient's CT scan for small pulmonary nodules that can manifest early lung cancer. However, radiologists routinely miss nodules due to fatigue and the error-prone nature of the work, which may ultimately lead to incorrect diagnostic decisions. It has been shown that detection performance can be improved significantly by employing a computer algorithm for pulmonary nodule identification. This dissertation is devoted to the topic of computer-aided detection (CAD) of pulmonary nodules from chest CT scans. The thesis includes several subtopics: system architecture, optimization and validation of the detection system. Among the major contributions to the topic are: design and development of a multiscale Laplacian of Gaussian-based candidate generation system, high specificity standard moments-based pulmonary vessel bifurcation filter, nonsolid nodule detection system, and a new detection system validation procedure that compensates for size measurement error and provides a more meaningful performance assessment for CAD systems. In addition, a large size-enriched dataset for CAD system evaluation was created to become a valuable resource for future research.
Advisors/Committee Members: Reeves, Anthony P (chair), Snavely, Keith Noah (committee member), Doerschuk, Peter (committee member).
Subjects/Keywords: Computer-aided detection; Pulmonary nodules; Computed tomography
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Fotin, S. (2011). Computer-Aided Detection Of Pulmonary Nodules From Ct Scans. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/33630
Chicago Manual of Style (16th Edition):
Fotin, Sergey. “Computer-Aided Detection Of Pulmonary Nodules From Ct Scans.” 2011. Doctoral Dissertation, Cornell University. Accessed March 01, 2021.
http://hdl.handle.net/1813/33630.
MLA Handbook (7th Edition):
Fotin, Sergey. “Computer-Aided Detection Of Pulmonary Nodules From Ct Scans.” 2011. Web. 01 Mar 2021.
Vancouver:
Fotin S. Computer-Aided Detection Of Pulmonary Nodules From Ct Scans. [Internet] [Doctoral dissertation]. Cornell University; 2011. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/1813/33630.
Council of Science Editors:
Fotin S. Computer-Aided Detection Of Pulmonary Nodules From Ct Scans. [Doctoral Dissertation]. Cornell University; 2011. Available from: http://hdl.handle.net/1813/33630
23.
Gharge, Saylee.
Segmentation of Medical Images.
Degree: Electronic, 2013, INFLIBNET
URL: http://shodhganga.inflibnet.ac.in/handle/10603/9107
► The use of digital images has increased at a rapid pace over the past decade. Many recent imaging modalities in medicine, such as magnetic resonance…
(more)
▼ The use of digital images has increased at a rapid
pace over the past decade. Many recent imaging modalities in
medicine, such as magnetic resonance imaging (MRI), computed
tomography (CT), digital mammography also generate images directly
in digital form. These technologies have greatly increased
knowledge of normal and diseased anatomy for medical research and
are a critical component in diagnosis and treatment planning. With
the increasing size and number of medical images, the use of
computers in facilitating their processing and analysis has become
necessary. Estimation of the volume of the whole organ, parts of
the organ and/or objects within an organ i.e. tumors is clinically
important in the analysis of medical image. The relative change in
size, shape and the spatial relationships between anatomical
structures obtained from intensity distributions provide important
information in clinical diagnosis for monitoring disease
progression for the radiologist. In particular, computer algorithms
for the delineation of anatomical structures and other regions of
interest are a key component in assisting and automating specific
radiological tasks. These algorithms, called image segmentation
algorithms, play a vital role in numerous biomedical imaging
applications. There is no single algorithm which gives the best
results for segmentation of every medical image.
References p. 146-180 and Appendix
included
Advisors/Committee Members: Kekre, H B.
Subjects/Keywords: Medical Images; Magnetic Resonance Imaging; Computed Tomography
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APA ·
Chicago ·
MLA ·
Vancouver ·
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Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Gharge, S. (2013). Segmentation of Medical Images. (Thesis). INFLIBNET. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/9107
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gharge, Saylee. “Segmentation of Medical Images.” 2013. Thesis, INFLIBNET. Accessed March 01, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/9107.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gharge, Saylee. “Segmentation of Medical Images.” 2013. Web. 01 Mar 2021.
Vancouver:
Gharge S. Segmentation of Medical Images. [Internet] [Thesis]. INFLIBNET; 2013. [cited 2021 Mar 01].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9107.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gharge S. Segmentation of Medical Images. [Thesis]. INFLIBNET; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9107
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Anna University
24.
Anita titus.
An intelligent framework for clinical decision making
from lung CT slices;.
Degree: An intelligent framework for clinical decision making
from lung CT slices, 2015, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/34164
► Computer Aided Diagnosis CAD is one of the major research areas in the field of medical imaging and radiology CAD systems are used by radiologists…
(more)
▼ Computer Aided Diagnosis CAD is one of the major
research areas in the field of medical imaging and radiology CAD
systems are used by radiologists for detection and differential
diagnosis of different types of abnormalities The output of a CAD
system can be used by radiologists along with laboratory results to
get a second opinion before making a diagnosis CAD systems are
developed based on an understanding of the radiological patterns
which have to be observed in the image for a particular disease
newlineIn this research work three approaches have been proposed
for improving the diagnosis of lung disorders from chest computed
tomography CT slices The first approach is for the classification
of Interstitial Lung Diseases ILDs such as emphysema fibrosis
ground glass opacities GGOs and miliary tuberculosis TB using a
particle swarm optimized support vector machine SVM The second
approach is a novel feature extraction scheme for the
classification of cavitary and miliary TB The third approach is a
scheme to extract and classify the pleural effusion and
pneumothorax regions in lung CT slices newline
newline
reference p185-195.
Advisors/Committee Members: Khanna nehemiah H.
Subjects/Keywords: Computed tomography; Computer Aided Diagnosis; Glass opacities
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APA ·
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MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
titus, A. (2015). An intelligent framework for clinical decision making
from lung CT slices;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/34164
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
titus, Anita. “An intelligent framework for clinical decision making
from lung CT slices;.” 2015. Thesis, Anna University. Accessed March 01, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/34164.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
titus, Anita. “An intelligent framework for clinical decision making
from lung CT slices;.” 2015. Web. 01 Mar 2021.
Vancouver:
titus A. An intelligent framework for clinical decision making
from lung CT slices;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Mar 01].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/34164.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
titus A. An intelligent framework for clinical decision making
from lung CT slices;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/34164
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Newcastle
25.
Gao, Jian.
Visibility of CT early ischemic change significantly associates with time from stroke onset to baseline scan.
Degree: MPhil, 2017, University of Newcastle
URL: http://hdl.handle.net/1959.13/1349936
► Masters Research - Master of Philosophy (MPhil)
Background: Non-contrast brain computed tomography (NCCT) remains the most common imaging modality employed to select patients for thrombolytic…
(more)
▼ Masters Research - Master of Philosophy (MPhil)
Background: Non-contrast brain computed tomography (NCCT) remains the most common imaging modality employed to select patients for thrombolytic therapy in acute ischemic stroke. The current study used the Alberta Stroke Program Early CT Score (ASPECTS) to identify early ischemic changes on brain NCCT imaging with the aim to investigate whether a relationship exists between time from symptoms onset to NCCT with the presence of early ischaemic change quantified by ASPECTS. Method: We studied 1,329 ischemic stroke patients who had NCCT within 8 hours of stroke onset. Patients were assessed to see if they had any ASPECTS lesion and if the rate of patients with a lesion increased with time using logistic regression. Results: 30% patients had an ASPECTS<10 within the first 3 hours from symptom onset. Within the first 3 hours, odds ratio for a CT change (ASPECTS<10) per minute of time was 1.00 with 95% confidence interval (0.99 to 1.00) (p=0.266). After 3 hours, there was a significant increase in odds of ASPECTS<10 with increasing time. The odds increased 1% (OR=1.01) per 1 minute of time with 95% confidence interval (1.00 to 1.01) (p=0.002). Conclusion: We have identified that prior to first 3 hours of stroke there was no effect of time on odds of CT ischemic change (ASPECTS<10); after the first 3 hours of stroke, the odds of a ASPECTS<10 increased with increasing time to CT scan. The occurrence of early ischemic change may be a marker of time from stroke onset rather than severity.
Advisors/Committee Members: University of Newcastle. Faculty of Health & Medicine, School of Medicine and Public Health.
Subjects/Keywords: stroke; tomography; x-ray computed; time
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gao, J. (2017). Visibility of CT early ischemic change significantly associates with time from stroke onset to baseline scan. (Masters Thesis). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1349936
Chicago Manual of Style (16th Edition):
Gao, Jian. “Visibility of CT early ischemic change significantly associates with time from stroke onset to baseline scan.” 2017. Masters Thesis, University of Newcastle. Accessed March 01, 2021.
http://hdl.handle.net/1959.13/1349936.
MLA Handbook (7th Edition):
Gao, Jian. “Visibility of CT early ischemic change significantly associates with time from stroke onset to baseline scan.” 2017. Web. 01 Mar 2021.
Vancouver:
Gao J. Visibility of CT early ischemic change significantly associates with time from stroke onset to baseline scan. [Internet] [Masters thesis]. University of Newcastle; 2017. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/1959.13/1349936.
Council of Science Editors:
Gao J. Visibility of CT early ischemic change significantly associates with time from stroke onset to baseline scan. [Masters Thesis]. University of Newcastle; 2017. Available from: http://hdl.handle.net/1959.13/1349936

North Carolina State University
26.
Hykes, Joshua Michael.
Verification and Validation of Radiation Transport Numerical Methods, Codes, and Nuclear Data for Estimating Radiation Dose to Patients.
Degree: MS, Nuclear Engineering, 2009, North Carolina State University
URL: http://www.lib.ncsu.edu/resolver/1840.16/1947
► Computed tomography (CT) is an invaluable diagnostic tool in current medical practice. Unfortunately, the radiation dose imparted during a CT scan can be significant. This…
(more)
▼ Computed tomography (CT) is an invaluable diagnostic tool in current medical practice. Unfortunately, the radiation dose imparted during a CT scan can be significant. This thesis seeks to develop, verify, and validate appropriate computational methods for computing this dose accurately and efficiently. The components of the model are the nuclear data, transport methods, and computer codes. Monte Carlo transport methods are employed primarily for their ability to accurately capture most of the relevant physical phenomena. Deterministic transport methods are subsequently verified and validated. The work is divided into three stages: experimental, verification, and validation. The experimental stage involves gathering high-fidelity data to aid in the validation procedures. Multiple radiation detection devices are employed to give greater certainty to the results. In addition, an important task is gathering data using a geometrically simplified phantom which is easier to model than the detailed Rando phantom. Towards this end, a CTDI FDA phantom is imaged. Exposure and dose measurements were taken in air and in the phantom center and periphery. The second stage, verification, involves the testing of the deterministic model for correctness of the methodology and the physics data, i.e. cross section library. Primarily, there are a few key assumptions which must be tested. The first is the importance of the secondary electron transport. Using Monte Carlo methods, it is found that the transport is unimportant for the accurate computation of the dose deposition distribution given the relatively low energy photons produced by x-rays tubes employed in CT scan machines. This makes the deterministic transport calculations much simpler. Next, the discretization of space, energy, and angle in the deterministic model is examined to ensure sufficient refinement capable of delivering accurate results. The Monte Carlo method is an excellent complement to deterministic methods, serving as reference as though it were an actual experiment, thus allowing the testing of these issues in a straightforward and highly controlled manner. In each discretization, the deterministic model proved capable, although some flux spectrum results differed by fifteen percent or more, mostly a result of the multigroup cross section set. Finally, after ensuring that the deterministic model was functioning as expected, a comparison was made of the simulations to the experimentally measured data. This was the most difficult of the tasks, in great part because of the lack of precise knowledge of detailed information concerning some of the parameters comprising the experimental setup. However, much effort was placed into conforming the simulations to the experiment as closely as possible. The ratio of exposures in the CTDI FDA phantom periphery-to-center is
computed to within experimental uncertainty of about ten percent, while the absolute
computed exposures have greater errors. The absolute exposures differed from the measured values by less…
Advisors/Committee Members: Dmitriy Y. Anistratov, Committee Member (advisor), Zhilin Li, Committee Member (advisor), Yousry Y. Azmy, Committee Chair (advisor).
Subjects/Keywords: deterministic radiation transport; computed tomography; radiation dose
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hykes, J. M. (2009). Verification and Validation of Radiation Transport Numerical Methods, Codes, and Nuclear Data for Estimating Radiation Dose to Patients. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/1947
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hykes, Joshua Michael. “Verification and Validation of Radiation Transport Numerical Methods, Codes, and Nuclear Data for Estimating Radiation Dose to Patients.” 2009. Thesis, North Carolina State University. Accessed March 01, 2021.
http://www.lib.ncsu.edu/resolver/1840.16/1947.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hykes, Joshua Michael. “Verification and Validation of Radiation Transport Numerical Methods, Codes, and Nuclear Data for Estimating Radiation Dose to Patients.” 2009. Web. 01 Mar 2021.
Vancouver:
Hykes JM. Verification and Validation of Radiation Transport Numerical Methods, Codes, and Nuclear Data for Estimating Radiation Dose to Patients. [Internet] [Thesis]. North Carolina State University; 2009. [cited 2021 Mar 01].
Available from: http://www.lib.ncsu.edu/resolver/1840.16/1947.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hykes JM. Verification and Validation of Radiation Transport Numerical Methods, Codes, and Nuclear Data for Estimating Radiation Dose to Patients. [Thesis]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/1947
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Otago
27.
Al-dameh, Ala.
Root canal preparation with two different rotary systems: comparative study assessed by micro-computed tomography
.
Degree: 2011, University of Otago
URL: http://hdl.handle.net/10523/1995
► Aim: To evaluate, using micro-computed tomography, the root canal transportation and centering ability of BioRaCe and AlphaKite rotary instruments, and their ability to eradicate canal…
(more)
▼ Aim: To evaluate, using micro-
computed tomography, the root canal transportation and centering ability of BioRaCe and AlphaKite rotary instruments, and their ability to eradicate canal variations after preparation of the mesiobuccal root of the first maxillary molar tooth.
Methodology: Mesiobuccal roots of 20 maxillary first molars with similar angles of curvature were divided randomly into two groups and scanned using a SkyScan 1172 micro-CT scanner (SkyScan N.V., Aartselaar, Belgium). Root canals were then prepared with BioRaCe (FKG Dentaire, La Chaux-de-Fonds, Switzerland) or AlphaKite (Komet, Lemgo, Germany) instruments. The prepared roots were re-scanned and cross-sectional images of the pre- and post-instrumentation scans were reconstructed using the SkyScan reconstruction software. The amount of transportation was assessed quantitatively using the cross-sectional images by measuring the shortest distance from the edge of the uninstrumented canal to the periphery of the root (mesial and distal) and then comparing this with the same measurements obtained from the instrumented images. A negative result indicates transportation toward the distal surface of the root (inner curvature), a positive result toward the mesial surface (outer curvature), and nil, the absence of transportation. The centering ratio was calculated by using a formula in which a result of ‘1’ indicates perfect centering. Student t-tests and ANOVA tests were used for statistical analysis. Three- dimensional images of the root canals were then reconstructed using the appropriate software (Amira 4.1; Visage Imaging Inc., USA), to evaluate eradication of canal variations by the two instruments.
Results: The average canal transportation with BioRaCe instruments at the coronal, middle and apical thirds were, -0.12 ± 0.19, -0.01 ± 0.09 and +0.06 ± 0.05 mm, respectively, with a significant difference (P < 0.05) in the amount of transportation between the coronal and apical levels. The average canal transportation with AlphaKite instruments in the coronal, middle and apical thirds were -0.05 ± 0.22, ₋0.04 ± 0.10 and +0.03 ± 0.03 mm, respectively, with no significant difference between the levels (P > 0.05). Centering ratio using BioRaCe at the coronal (0.32 ± 0.25), middle (0.53 ± 0.23), and apical (0.57 ± 0.27) thirds showed no significant difference between the levels (P > 0.05). For the AlphaKite system, the centering ratio results were (0.46 ± 0.31) for the coronal, (0.56 ± 0.29) for the middle and (0.66 ± 0.24) for the apical thirds. No significant difference was found between the levels (P > 0.05). There was no statistically significant difference between the systems in regard to canal transportation and their centering ability across all levels (P > 0.05). Neither was able to completely eradicate canal variations of the mesiobuccal root of maxillary first molars.
Conclusions: Within the limitations of this ex vivo study, the two new nickel-titanium instruments produced moderately well centered canals with minimal canal transportation.…
Advisors/Committee Members: Love, Robert (advisor).
Subjects/Keywords: rotary canal preparation;
Micro-computed tomography
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Al-dameh, A. (2011). Root canal preparation with two different rotary systems: comparative study assessed by micro-computed tomography
. (Doctoral Dissertation). University of Otago. Retrieved from http://hdl.handle.net/10523/1995
Chicago Manual of Style (16th Edition):
Al-dameh, Ala. “Root canal preparation with two different rotary systems: comparative study assessed by micro-computed tomography
.” 2011. Doctoral Dissertation, University of Otago. Accessed March 01, 2021.
http://hdl.handle.net/10523/1995.
MLA Handbook (7th Edition):
Al-dameh, Ala. “Root canal preparation with two different rotary systems: comparative study assessed by micro-computed tomography
.” 2011. Web. 01 Mar 2021.
Vancouver:
Al-dameh A. Root canal preparation with two different rotary systems: comparative study assessed by micro-computed tomography
. [Internet] [Doctoral dissertation]. University of Otago; 2011. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10523/1995.
Council of Science Editors:
Al-dameh A. Root canal preparation with two different rotary systems: comparative study assessed by micro-computed tomography
. [Doctoral Dissertation]. University of Otago; 2011. Available from: http://hdl.handle.net/10523/1995
28.
Liu, Rui.
The Software and Hardware Acceleration for Interior Tomography.
Degree: 2016, Wake Forest University
URL: http://hdl.handle.net/10339/64178
► The x-ray CT is with high spatial resolution, temporal resolutions, and high-speed imaging characteristic. The iterative reconstruction algorithms are becoming more important since they can…
(more)
▼ The x-ray CT is with high spatial resolution, temporal resolutions, and high-speed imaging characteristic. The iterative reconstruction algorithms are becoming more important since they can reconstruct better image qualities from incomplete projection data compared to analytical reconstruction algorithms. Iterative reconstruction algorithms also allow more flexible trajectories. However, the high computational cost prevents them from wide applications in clinics. Therefore, it is necessary to develop software and hardware methods to accelerate the iterative reconstruction algorithms. The main methods to accelerate iterative reconstruction algorithms can be either expedite the convergence rate of the algorithm mathematically or directly accelerating the most time-consuming projection / backprojection procedures.
Subjects/Keywords: Computed Tomography
…Reconstruction
CT: Computed Tomography
IRAs: Iterative Reconstruction Algorithms
CUDA: Compute Unified… …SVD
SPECT: Single Photon Emission Computed
Tomography
16
Abstract
The x-ray CT is with… …X-ray computed tomography (CT) is one of the main modern imaging modalities. It… …Inspired by the CS theory, the interior problem in computed tomography is
proved uniquely… …Introduction
The x-ray computed tomography (CT) has been an indispensable imaging modality…
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liu, R. (2016). The Software and Hardware Acceleration for Interior Tomography. (Thesis). Wake Forest University. Retrieved from http://hdl.handle.net/10339/64178
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Liu, Rui. “The Software and Hardware Acceleration for Interior Tomography.” 2016. Thesis, Wake Forest University. Accessed March 01, 2021.
http://hdl.handle.net/10339/64178.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liu, Rui. “The Software and Hardware Acceleration for Interior Tomography.” 2016. Web. 01 Mar 2021.
Vancouver:
Liu R. The Software and Hardware Acceleration for Interior Tomography. [Internet] [Thesis]. Wake Forest University; 2016. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10339/64178.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liu R. The Software and Hardware Acceleration for Interior Tomography. [Thesis]. Wake Forest University; 2016. Available from: http://hdl.handle.net/10339/64178
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
29.
Bharkhada, Deepak.
Development of Novel Cardiac CT Methods.
Degree: 2010, Wake Forest University
URL: http://hdl.handle.net/10339/14902
► Cardiovascular diseases (CVD) are the number one killer in US and worldwide. In 2005, 1 in every 2.7 deaths was associated with CVD. Cardiac CT…
(more)
▼ Cardiovascular diseases (CVD) are the number one killer in US and worldwide. In 2005, 1 in every 2.7 deaths was associated with CVD. Cardiac CT has become a very valuable tool for non-invasive CVD diagnosis due to enabling technologies like helical scanning, fast rotation, multi-row detector, and advanced image reconstruction. However, challenges like cone-beam artifact reduction, temporal resolution improvement and x-ray dose reduction must be met to improve and broaden cardiac CT applications. To address these issues, the methods of interior tomography, compressive sensing based algorithms, knowledge-based dynamic volumetric cardiac CT, and controlled cardiac CT were developed along with novel trajectories like saddle curves and composite-circling scanning.
Interior tomography permits reconstruction of a region of interest (ROI) using only the x-rays through the ROI, provided that we have appropriate prior knowledge such as the intensity of a small sub-region within the ROI. We evaluated the dose and scatter reduction capabilities of this method. Our results indicate that x-ray dose and scatter can be reduced respectively by ~18 to ~57% and ~19 to ~59% for SFOVs of 21 to 9 cm as compared to the 50 cm SFOV. We evaluated the possibility of using blood in aorta and bone in vertebra as known information. To enable accurate interior tomography reconstruction, we also developed an extended projection onto convex sets (POCS) based method and studied the contributions of individual constraints.
Using the compressive sensing theory, it has recently become possible to reconstruct a piece-wise constant ROI using interior tomography. The ability of a total-variation minimization based algorithm was then demonstrated with a limited number of projections. Since the circular cone-beam trajectory does not satisfy the data completeness condition, which results in artifacts, we extended it to the composite-circling trajectory. We obtained promising results, for the thorax phantom, using just 50 views.
Knowledge-based dynamic volumetric cardiac CT algorithm is capable of reconstructing multiple-states of a beating heart based on the relationship between the state (e.g. volume) and phase (e.g. ECG). This algorithm was originally proposed using circular trajectory, which does not allow exact reconstruction. We extended it to a saddle-curve trajectory for exact reconstruction. Promising results were obtained with this knowledge-based approach for accurate reconstruction.
Controlled cardiac CT proposes instantaneous change in the x-ray source velocity to acquire the required projections in a minimum time. The fast acquisitions with this approach result in a non-uniform distribution of x-ray source positions along a scanning trajectory. The implementation of analytical filtered-backprojection reconstruction algorithms used involves multiplication with a uniform angular discretization term. This could lead to reduced image quality especially if fewer views are used. We used triangle based linear interpolation,…
Subjects/Keywords: Computed Tomography
…62
References for Chapter III... ..64
IV. Cardiac Computed Tomography… …Reductions for Interior Computed
Tomography …...93
Abstract… …Computed Tomography .. ...…156
Abstract ... ….157
VIII.1… …SOURCE X-RAY COMPUTED TOMOGRAPHY
As we target higher and higher spatial resolutions, the… …overcome this limitation we
proposed “Line-source X-ray Computed Tomography”. The x-ray source is…
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bharkhada, D. (2010). Development of Novel Cardiac CT Methods. (Thesis). Wake Forest University. Retrieved from http://hdl.handle.net/10339/14902
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bharkhada, Deepak. “Development of Novel Cardiac CT Methods.” 2010. Thesis, Wake Forest University. Accessed March 01, 2021.
http://hdl.handle.net/10339/14902.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bharkhada, Deepak. “Development of Novel Cardiac CT Methods.” 2010. Web. 01 Mar 2021.
Vancouver:
Bharkhada D. Development of Novel Cardiac CT Methods. [Internet] [Thesis]. Wake Forest University; 2010. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10339/14902.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bharkhada D. Development of Novel Cardiac CT Methods. [Thesis]. Wake Forest University; 2010. Available from: http://hdl.handle.net/10339/14902
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Miao, Chuang.
COMPARATIVE STUDIES OF DIFFERENT SYSTEM MODELS FOR ITERATIVE CT IMAGE RECONSTRUCTION.
Degree: 2013, Wake Forest University
URL: http://hdl.handle.net/10339/38514
► In this thesis, we propose an improved distance-driven model (IDDM) whose computational cost is as low as the distance-driven model (DDM) and the accuracy is…
(more)
▼ In this thesis, we propose an improved distance-driven model (IDDM) whose computational cost is as low as the distance-driven model (DDM) and the accuracy is comparable with the area integral model (AIM). The performance of different system models, such as pixel-driven model (PDM), ray-driven model (RDM), AIM, DDM and IDDM, are compared in the content of iterative CT image reconstruction algorithms. One of the key factors that limit the clinical application of an iterative reconstruction algorithm is the high computational cost which mainly depends on the system model. This thesis can serve as the basis for the acceleration study and will have a direct impact on development of fast and accurate iterative CT image reconstruction algorithms.
Subjects/Keywords: Computed Tomography
…CT
Computed Tomography
EBCT
Electron Beam Computed Tomography
FOV
Field of View
FWHMs… …Simultaneous Algebraic Reconstruction Technique
SPECT
Single Photon Emission Computed Tomography
xi… …Tomography
The first commercial x-ray Computed Tomography (CT) prototype was built in… …x29; [2-5].
Single Photon Emission Computed Tomography (SPECT) [6-8… …Pixel-driven Model
PET
Positron Emission Tomography
RDM
Ray-driven Model
SART…
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Miao, C. (2013). COMPARATIVE STUDIES OF DIFFERENT SYSTEM MODELS FOR ITERATIVE CT IMAGE RECONSTRUCTION. (Thesis). Wake Forest University. Retrieved from http://hdl.handle.net/10339/38514
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Miao, Chuang. “COMPARATIVE STUDIES OF DIFFERENT SYSTEM MODELS FOR ITERATIVE CT IMAGE RECONSTRUCTION.” 2013. Thesis, Wake Forest University. Accessed March 01, 2021.
http://hdl.handle.net/10339/38514.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Miao, Chuang. “COMPARATIVE STUDIES OF DIFFERENT SYSTEM MODELS FOR ITERATIVE CT IMAGE RECONSTRUCTION.” 2013. Web. 01 Mar 2021.
Vancouver:
Miao C. COMPARATIVE STUDIES OF DIFFERENT SYSTEM MODELS FOR ITERATIVE CT IMAGE RECONSTRUCTION. [Internet] [Thesis]. Wake Forest University; 2013. [cited 2021 Mar 01].
Available from: http://hdl.handle.net/10339/38514.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Miao C. COMPARATIVE STUDIES OF DIFFERENT SYSTEM MODELS FOR ITERATIVE CT IMAGE RECONSTRUCTION. [Thesis]. Wake Forest University; 2013. Available from: http://hdl.handle.net/10339/38514
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] … [62] ▶
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