subject:(Megavoltage Cone beam CT)

Queensland University of Technology

1. Markwell, Timothy S. MegaVoltage Cone Beam Computed Tomography with a standard medical linear accelerator.

Degree: 2015, Queensland University of Technology

► Accurate patient positioning is vital for improved clinical outcomes for cancer treatments using radiotherapy. This project has developed Mega Voltage Cone Beam CT using a… (more)

Subjects/Keywords: Radiotherapy; MegaVoltage; Cone Beam CT; Computer Tomography; Medical Imaging

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APA (6^th Edition):

Markwell, T. S. (2015). MegaVoltage Cone Beam Computed Tomography with a standard medical linear accelerator. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/87438/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Markwell, Timothy S. “MegaVoltage Cone Beam Computed Tomography with a standard medical linear accelerator.” 2015. Thesis, Queensland University of Technology. Accessed January 15, 2021. https://eprints.qut.edu.au/87438/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Markwell, Timothy S. “MegaVoltage Cone Beam Computed Tomography with a standard medical linear accelerator.” 2015. Web. 15 Jan 2021.

Vancouver:

Markwell TS. MegaVoltage Cone Beam Computed Tomography with a standard medical linear accelerator. [Internet] [Thesis]. Queensland University of Technology; 2015. [cited 2021 Jan 15]. Available from: https://eprints.qut.edu.au/87438/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Markwell TS. MegaVoltage Cone Beam Computed Tomography with a standard medical linear accelerator. [Thesis]. Queensland University of Technology; 2015. Available from: https://eprints.qut.edu.au/87438/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – San Francisco

2. Morin, Olivier. The Development and Role of Megavoltage Cone Beam Computed Tomography in Radiation Oncology.

Degree: Bioengineering, 2007, University of California – San Francisco

URL: http://www.escholarship.org/uc/item/0gn8q535

► External beam radiation therapy has now the ability to deliver doses that conform tightly to a tumor volume. The steep dose gradients planned in these… (more)

▼ External beam radiation therapy has now the ability to deliver doses that conform tightly to a tumor volume. The steep dose gradients planned in these treatments make it increasingly important to reproduce the patient position and anatomy at each treatment fraction. For this reason, considerable research now focuses on in-room three-dimensional imaging. This thesis describes the first clinical megavoltage cone beam computed tomography (MVCBCT) system, which utilizes a conventional linear accelerator equipped with an amorphous silicon flat panel detector. The document covers the system development and investigation of its clinical applications over the last 4-5 years. The physical performance of the system was evaluated and optimized for soft-tissue contrast resolution leading to recommendations of imaging protocols to use for specific clinical applications and body sites. MVCBCT images can resolve differences of 5% in electron density for a mean dose of 9 cGy. Hence, the image quality of this system is sufficient to differentiate some soft-tissue structures. The absolute positioning accuracy with MVCBCT is better than 1 mm. The accuracy of isodose lines calculated using MVCBCT images of head and neck patients is within 3% and 3 mm. The system shows excellent stability in image quality, CT# calibration, radiation exposure and absolute positioning over a period of 8 months. A procedure for MVCBCT quality assurance was developed. In our clinic, MVCBCT has been used to detect head and neck set-up errors, to position a patient with a paraspinous tumor close to metallic hardware, to position prostate cancer patients using gold markers or soft-tissue landmarks, to monitor head and neck anatomical changes and their dosimetric consequences, and for treatment planning contouring in presence of metallic implants. MVCBCT imaging is changing the clinical practice of our department by increasingly revealing patient-specific localization and/or anatomy variation errors. New verification protocols are being developed to minimize those errors thus moving the practice of radiation therapy one step closer to personalized medicine.

Subjects/Keywords: Engineering, Biomedical; Physics, Radiation; Engineering, Biomedical; megavoltage cone beam CT; image-guided radiation therapy; intensity-modulated radiation therapy; external-beam radiation therapy; cone beam CT; imaging

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APA (6^th Edition):

Morin, O. (2007). The Development and Role of Megavoltage Cone Beam Computed Tomography in Radiation Oncology. (Thesis). University of California – San Francisco. Retrieved from http://www.escholarship.org/uc/item/0gn8q535

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Morin, Olivier. “The Development and Role of Megavoltage Cone Beam Computed Tomography in Radiation Oncology.” 2007. Thesis, University of California – San Francisco. Accessed January 15, 2021. http://www.escholarship.org/uc/item/0gn8q535.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Morin, Olivier. “The Development and Role of Megavoltage Cone Beam Computed Tomography in Radiation Oncology.” 2007. Web. 15 Jan 2021.

Vancouver:

Morin O. The Development and Role of Megavoltage Cone Beam Computed Tomography in Radiation Oncology. [Internet] [Thesis]. University of California – San Francisco; 2007. [cited 2021 Jan 15]. Available from: http://www.escholarship.org/uc/item/0gn8q535.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Morin O. The Development and Role of Megavoltage Cone Beam Computed Tomography in Radiation Oncology. [Thesis]. University of California – San Francisco; 2007. Available from: http://www.escholarship.org/uc/item/0gn8q535

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

3. Kirvan, Paul Francis. Performance of a cadmium tungstate MVCT scanner.

Degree: MS, Department of Physics, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/rv042v65c

► Megavoltage computed tomography (MVCT) and megavoltage cone beam computed tomography can be used for visualizing anatomical structures prior to radiation therapy treatments to assist in… (more)

Subjects/Keywords: megavoltage computed tomography; image performance; resolution; cone beam computed tomography; contrast to noise ratio

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APA (6^th Edition):

Kirvan, P. F. (2010). Performance of a cadmium tungstate MVCT scanner. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/rv042v65c

Chicago Manual of Style (16^th Edition):

Kirvan, Paul Francis. “Performance of a cadmium tungstate MVCT scanner.” 2010. Masters Thesis, University of Alberta. Accessed January 15, 2021. https://era.library.ualberta.ca/files/rv042v65c.

MLA Handbook (7^th Edition):

Kirvan, Paul Francis. “Performance of a cadmium tungstate MVCT scanner.” 2010. Web. 15 Jan 2021.

Vancouver:

Kirvan PF. Performance of a cadmium tungstate MVCT scanner. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2021 Jan 15]. Available from: https://era.library.ualberta.ca/files/rv042v65c.

Council of Science Editors:

Kirvan PF. Performance of a cadmium tungstate MVCT scanner. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/rv042v65c

University of Rochester

4. Zhang, Xiaohua (1979 - ). Computer aided diagnosis for cone beam breast CT.

Degree: PhD, 2011, University of Rochester

URL: http://hdl.handle.net/1802/16436

► Cone Beam Breast Computed Tomography (CBBCT) has been developed as a technology dedicated to breast imaging. The system has relatively low radiation dose, high contrast… (more)

▼ Cone Beam Breast Computed Tomography (CBBCT) has been developed as a technology dedicated to breast imaging. The system has relatively low radiation dose, high contrast resolution, high contrast-noise ratio, and isotropic high resolution. The CBBCT imaging field is large enough to cover the whole breast in one scan. Without tissue overlap, the breast’s anatomic structure is clearly revealed in CBBCT reconstruction images with precise three-dimensional (3D) spatial distribution and morphological characteristics. Compared with mammograms and breast MRI, CBBCT images are able to provide more information to the radiologists. The accuracy of breast lesion diagnosis can potentially be improved with CBBCT images. With high resolution 3D visualization, CBBCT images usually have a huge volume of data. Reviewing the data, locating all possible lesions, and making a correct diagnosis with CBBCT images may be a time consuming task for radiologists. Radiologists' accuracy, consistency, and efficiency may decrease when continuously reviewing the CBBCT volume data. In this thesis, a CBBCT-based Computer Aided Diagnosis (CAD) system is proposed and developed to serve as a "second reader" of the CBBCT volume data. With algorithms designed to take advantage of the CBBCT characteristics and reveal possible lesions with supplementary information, CBBCT CAD can help radiologists to further increase their diagnostic accuracy and efficiency. In this thesis five major components of the CBBCT CAD system have been designed based on the diagnostic requirements: 1. A 3D noise reduction scheme to improve the visualization of the 3D CBBCT image volume; 2. A 3D auto-detection scheme to detect calcifications in CBBCT images; 3. A 3D auto-detection scheme to detect suspicious masses in CBBCT images; 4. A mastectomy specimen experiment to validate the feasibility of CBBCT ductography; and 5. A 3D auto-segmentation scheme to evaluate the breast density based on CBBCT 3D images. The experimental results of CBBCT CAD are presented and future work is planned.

Subjects/Keywords: CAD; Cone beam breast CT; CBBCT

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APA (6^th Edition):

Zhang, X. (. -. ). (2011). Computer aided diagnosis for cone beam breast CT. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/16436

Chicago Manual of Style (16^th Edition):

Zhang, Xiaohua (1979 - ). “Computer aided diagnosis for cone beam breast CT.” 2011. Doctoral Dissertation, University of Rochester. Accessed January 15, 2021. http://hdl.handle.net/1802/16436.

MLA Handbook (7^th Edition):

Zhang, Xiaohua (1979 - ). “Computer aided diagnosis for cone beam breast CT.” 2011. Web. 15 Jan 2021.

Vancouver:

Zhang X(-). Computer aided diagnosis for cone beam breast CT. [Internet] [Doctoral dissertation]. University of Rochester; 2011. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1802/16436.

Council of Science Editors:

Zhang X(-). Computer aided diagnosis for cone beam breast CT. [Doctoral Dissertation]. University of Rochester; 2011. Available from: http://hdl.handle.net/1802/16436

University of Bath

5. Pengpan, Thanyawee. A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography.

Degree: PhD, 2012, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873

► Cone-beam computed tomography (CBCT) is an imaging technique used in conjunction with radiation therapy. CBCT is used to verify the position of tumours just prior… (more)

Subjects/Keywords: 616.0757; cone beam CT; Motion compensation; EIT

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APA (6^th Edition):

Pengpan, T. (2012). A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873

Chicago Manual of Style (16^th Edition):

Pengpan, Thanyawee. “A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography.” 2012. Doctoral Dissertation, University of Bath. Accessed January 15, 2021. https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873.

MLA Handbook (7^th Edition):

Pengpan, Thanyawee. “A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography.” 2012. Web. 15 Jan 2021.

Vancouver:

Pengpan T. A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography. [Internet] [Doctoral dissertation]. University of Bath; 2012. [cited 2021 Jan 15]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873.

Council of Science Editors:

Pengpan T. A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography. [Doctoral Dissertation]. University of Bath; 2012. Available from: https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873

Delft University of Technology

6. Undetermined, U. (author). Correlating scored daily anatomical changes to in-vivo EPID dosimetry and cone beam CT based dose calculations: A retrospective study.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:b69226f9-c00b-4137-819c-7e6a6ea4aea4

► At the Antoni van Leeuwenhoek Hospital/Dutch Cancer Institute (NKI-AvL) in Amsterdam, inter-fractional anatomical changes during the course of radiotherapy are monitored using cone beam CT… (more)

▼ At the Antoni van Leeuwenhoek Hospital/Dutch Cancer Institute (NKI-AvL) in Amsterdam, inter-fractional anatomical changes during the course of radiotherapy are monitored using cone beam CT scans, taken prior to irradiation. These scans are assessed visually, and the fractions are scored according to a 'traffic light protocol'. Based on the magnitude of change, a green, yellow, orange or red colour, in increasing order of severity, is assigned to the fraction. The goal of this work was to ascertain if the colour of the traffic lights, which were assumed to be indicators of anatomical change, correlate to changes in dosimetry for H\&N VMAT treatments, as well as lung IMRT treatments. The in-vivo EPID dose was reconstructed in the patient for each fraction, using a back-projection algorithm that is used clinically at the NKI. Calibrated CBCTs of each fraction were obtained using DIR or anti-scatter grid methods researched at the NKI, which were then imported to a TPS to obtain the fraction dose. These two modes of dosimetry were compared against each other, as well as against the traffic light colours for H\&N treatments. For lung treatments, due to unavailability of CBCT based dose data, only EPID dosimetry was used; two different models of the back-projection algorithm were compared in this case. γ index and DVH metrics were used to express deviation in the dose distributions. Deviations over successive fractions for 18 H\&N treatments were studied. The traffic light protocol correlated poorly with CBCT based dose and EPID reconstructed dose (ρ = 0.33 and 0.35 respectively). The CBCT and EPID dose correlated with each other quite strongly (ρ = 0.72), however the EPID dose was more sensitive in its fluctuations. Deviations for 98 IMRT lung fractions were studied. The traffic light protocol correlated even more poorly with the EPID reconstructed dose than in the H\&N study (ρ = 0.18). The calculated transmission model of the EPID was found to exaggerate the deviations in comparison to the measured transmission model. Since VMAT innately uses the calculated transmission model, this explains the sensitivity of the EPID results seen in the H\&N study. We have shown that the traffic light protocol does not correlate with dosimetric changes, due to differences in assessment criteria. 15 out of 18 H\&N treatments showed moderate (ρ ≥ 0.4), if not strong, correlations between deviations of EPID reconstructed dose and CBCT based dose, strengthening the EPID's applicability for in-vivo dosimetry. Advisors/Committee Members: Schaart, Dennis (mentor), Mans, Anton (mentor), Olaciregui-Ruiz, Igor (mentor), Vos, Frans (graduation committee), Perko, Zoltan (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Radiotherapy; epid dosimetry; cone beam CT

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APA (6^th Edition):

Undetermined, U. (. (2017). Correlating scored daily anatomical changes to in-vivo EPID dosimetry and cone beam CT based dose calculations: A retrospective study. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b69226f9-c00b-4137-819c-7e6a6ea4aea4

Chicago Manual of Style (16^th Edition):

Undetermined, U (author). “Correlating scored daily anatomical changes to in-vivo EPID dosimetry and cone beam CT based dose calculations: A retrospective study.” 2017. Masters Thesis, Delft University of Technology. Accessed January 15, 2021. http://resolver.tudelft.nl/uuid:b69226f9-c00b-4137-819c-7e6a6ea4aea4.

MLA Handbook (7^th Edition):

Undetermined, U (author). “Correlating scored daily anatomical changes to in-vivo EPID dosimetry and cone beam CT based dose calculations: A retrospective study.” 2017. Web. 15 Jan 2021.

Vancouver:

Undetermined U(. Correlating scored daily anatomical changes to in-vivo EPID dosimetry and cone beam CT based dose calculations: A retrospective study. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Jan 15]. Available from: http://resolver.tudelft.nl/uuid:b69226f9-c00b-4137-819c-7e6a6ea4aea4.

Council of Science Editors:

Undetermined U(. Correlating scored daily anatomical changes to in-vivo EPID dosimetry and cone beam CT based dose calculations: A retrospective study. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:b69226f9-c00b-4137-819c-7e6a6ea4aea4

University of Southern California

7. Pambrun, Jason Michael. A cone beam-CT evaluation of the proximity of the maxillary sinus to commonly used TAD sites.

Degree: MS, Cranio-Facial Biology, 2007, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/322073/rec/151

► Introduction: The purpose of this study was to characterize common TAD placement sites in the posterior maxilla and their proximity to the maxillary sinus, and… (more)

Subjects/Keywords: cone beam-CT

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APA (6^th Edition):

Pambrun, J. M. (2007). A cone beam-CT evaluation of the proximity of the maxillary sinus to commonly used TAD sites. (Masters Thesis). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/322073/rec/151

Chicago Manual of Style (16^th Edition):

Pambrun, Jason Michael. “A cone beam-CT evaluation of the proximity of the maxillary sinus to commonly used TAD sites.” 2007. Masters Thesis, University of Southern California. Accessed January 15, 2021. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/322073/rec/151.

MLA Handbook (7^th Edition):

Pambrun, Jason Michael. “A cone beam-CT evaluation of the proximity of the maxillary sinus to commonly used TAD sites.” 2007. Web. 15 Jan 2021.

Vancouver:

Pambrun JM. A cone beam-CT evaluation of the proximity of the maxillary sinus to commonly used TAD sites. [Internet] [Masters thesis]. University of Southern California; 2007. [cited 2021 Jan 15]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/322073/rec/151.

Council of Science Editors:

Pambrun JM. A cone beam-CT evaluation of the proximity of the maxillary sinus to commonly used TAD sites. [Masters Thesis]. University of Southern California; 2007. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/322073/rec/151

University of Rochester

8. Zhang, Yan (1978 - ). Three-dimensional image quality evaluation and improvement in flat-panel detector based cone-beam CT imaging.

Degree: PhD, 2011, University of Rochester

URL: http://hdl.handle.net/1802/14426

► Due to the development of flat-panel detector (FPD) in recent years, FPD-based cone beam computed tomography (CBCT) made a breakthrough in CT imaging in terms… (more)

▼ Due to the development of flat-panel detector (FPD) in recent years, FPD-based cone beam computed tomography (CBCT) made a breakthrough in CT imaging in terms of large volume reconstruction and isotropic resolution. This technique provides three-dimensional (3D) visualization of the imaged anatomy with one single circular scan, enabling one to reformat slices at any arbitrary orientation with high spatial resolution. Due to all these advantages, FPD-based CBCT has become the most promising imaging modality in many medical fields, including small animal imaging, breast imaging, bone imaging, etc. As a potential diagnostic imaging tool for medical professionals, FPD-based CBCT needs to consistently provide high-quality images. Therefore, it’s important to fully evaluate its imaging performance and to be able to correct the image artifacts that arise from various sources. This dissertation focuses on two primary issues faced by FPD-based CBCT: 3D image quality evaluation and image quality improvement with artifact correction. The five chapters that follow deal with the following five matters: (1) First, new image quality evaluation methods are proposed to evaluate major image quality factors of CBCT based on its 3D volume reconstruction characteristic. (2) Second, a noise model is developed to study the noise level in reconstructed 3D images – this model allows one to study the relationship between noise level and various parameters of CBCT system. (3) Third, the relationship between image lag in CBCT and different detector parameter, as well as x-ray techniques, are investigated; this chapter also characterizes the quantitative effect of image lag on image quality in breast imaging. (4) A correction method is developed to correct for the streaking and shading artifacts caused by metal implants in FPD-based CBCT bone imaging. (5) Finally, a simple artifact correction method is developed to correct for the dark strip that appears at the chest-wall in breast imaging, a consequence of incomplete projections.

Subjects/Keywords: Cone-beam CT; Image quality; Flat-panel detector; Image noise; Beam hardening; Breast CT

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APA (6^th Edition):

Zhang, Y. (. -. ). (2011). Three-dimensional image quality evaluation and improvement in flat-panel detector based cone-beam CT imaging. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/14426

Chicago Manual of Style (16^th Edition):

Zhang, Yan (1978 - ). “Three-dimensional image quality evaluation and improvement in flat-panel detector based cone-beam CT imaging.” 2011. Doctoral Dissertation, University of Rochester. Accessed January 15, 2021. http://hdl.handle.net/1802/14426.

MLA Handbook (7^th Edition):

Zhang, Yan (1978 - ). “Three-dimensional image quality evaluation and improvement in flat-panel detector based cone-beam CT imaging.” 2011. Web. 15 Jan 2021.

Vancouver:

Zhang Y(-). Three-dimensional image quality evaluation and improvement in flat-panel detector based cone-beam CT imaging. [Internet] [Doctoral dissertation]. University of Rochester; 2011. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1802/14426.

Council of Science Editors:

Zhang Y(-). Three-dimensional image quality evaluation and improvement in flat-panel detector based cone-beam CT imaging. [Doctoral Dissertation]. University of Rochester; 2011. Available from: http://hdl.handle.net/1802/14426

Duke University

9. Li, Hao. Investigation of Imaging Capabilities for Dual Cone-Beam Computed Tomography .

Degree: 2013, Duke University

URL: http://hdl.handle.net/10161/8062

► A bench-top dual cone-beam computed tomography (CBCT) system was developed consisting of two orthogonally placed 40x30 cm² flat-panel detectors and two conventional X-ray tubes… (more)

▼ A bench-top dual cone-beam computed tomography (CBCT) system was developed consisting of two orthogonally placed 40x30 cm² flat-panel detectors and two conventional X-ray tubes with two individual high-voltage generators sharing the same rotational axis. The X-ray source to detector distance is 150 cm and X-ray source to rotational axis distance is 100 cm for both subsystems. The objects are scanned through 200° of rotation. The dual CBCT (DCBCT) system utilized 110° of projection data from one detector and 90° from the other while the two individual single CBCTs utilized 200° data from each detector. The system performance was characterized in terms of uniformity, contrast, spatial resolution, noise power spectrum and CT number linearity. The uniformity, within the axial slice and along the longitudinal direction, and noise power spectrum were assessed by scanning a water bucket; the contrast and CT number linearity were measured using the Catphan phantom; and the spatial resolution was evaluated using a tungsten wire phantom. A skull phantom and a ham were also scanned to provide qualitative evaluation of high- and low-contrast resolution. Each measurement was compared between dual and single CBCT systems. Compared with single CBCT, the DCBCT presented: 1) a decrease in uniformity by 1.9% in axial view and 1.1% in the longitudinal view, as averaged for four energies (80, 100, 125 and 150 kVp); 2) comparable or slightly better contrast to noise ratio (CNR) for low-contrast objects and comparable contrast for high-contrast objects; 3) comparable spatial resolution; 4) comparable CT number linearity with R² ≥ 0.99 for all four tested energies; 5) lower noise power spectrum in magnitude. DCBCT images of the skull phantom and the ham demonstrated both high-contrast resolution and good soft-tissue contrast. One of the major challenges for clinical implementation of four-dimensional (4D) CBCT is the long scan time. To investigate the 4D imaging capabilities of the DCBCT system, motion phantom studies were conducted to validate the efficiency by comparing 4D images generated from 4D-DCBCT and 4D-CBCT. First, a simple sinusoidal profile was used to confirm the scan time reduction. Next, both irregular sinusoidal and patient-derived profiles were used to investigate the advantage of temporally correlated orthogonal projections due to a reduced scan time. Normalized mutual information (NMI) between 4D-DCBCT and 4D-CBCT was used for quantitative evaluation. For the simple sinusoidal profile, the average NMI for ten phases between two single 4D-CBCTs was 0.336, indicating the maximum NMI that can be achieved for this study. The average NMIs between 4D-DCBCT and each single 4D-CBCT were 0.331 and 0.320. For both irregular sinusoidal and patient-derived profiles, 4D-DCBCT generated phase images with less motion blurring when compared with single 4D-CBCT. For dual kV energy imaging, we acquired 80kVp projections and 150 kVp projections, with an additional 0.8 mm tin… Advisors/Committee Members: Yin, Fang-Fang (advisor).

Subjects/Keywords: Medical imaging and radiology; computed tomography; cone-beam; dual-energy; four-dimensional imaging; image guided radiation therapy; megavoltage

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APA (6^th Edition):

Li, H. (2013). Investigation of Imaging Capabilities for Dual Cone-Beam Computed Tomography . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/8062

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Hao. “Investigation of Imaging Capabilities for Dual Cone-Beam Computed Tomography .” 2013. Thesis, Duke University. Accessed January 15, 2021. http://hdl.handle.net/10161/8062.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Hao. “Investigation of Imaging Capabilities for Dual Cone-Beam Computed Tomography .” 2013. Web. 15 Jan 2021.

Vancouver:

Li H. Investigation of Imaging Capabilities for Dual Cone-Beam Computed Tomography . [Internet] [Thesis]. Duke University; 2013. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10161/8062.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li H. Investigation of Imaging Capabilities for Dual Cone-Beam Computed Tomography . [Thesis]. Duke University; 2013. Available from: http://hdl.handle.net/10161/8062

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universiteit Utrecht

10. Braak, S.J. Cone-beam CT-guidance in Interventional Radiology.

Degree: 2012, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/256016

► OBJECTIVE. CBCT-guidance (CBCT-guidance) is a new stereotactic technique for needle interventions, combining 3D soft-tissue cone-beam CT, needle planningsoftware, and real-time fluoroscopy. Our objective was to… (more)

▼ OBJECTIVE. CBCT-guidance (CBCT-guidance) is a new stereotactic technique for needle interventions, combining 3D soft-tissue cone-beam CT, needle planningsoftware, and real-time fluoroscopy. Our objective was to evaluate the use, feasibility and outcome of this technique. To determine the effective dose for the patient and operator during these procedures and to use the merging modality of this sytems is to quantify the kidney movement by transfer the patient from supine to prone position. MATERIALS AND METHODS. All procedures were performed using a flat-panel based fluoroscopy-system capable of acquiring cone-beam CT-images with dedicated needle path planning software. In the data set, a needle trajectory is determined and, after co-registration, a fusion image is created from fluoroscopy and a slice from the data set, enabling the needle to be positioned in real-time. In a spine phantom we analyzed the outcome of randomized CBCT-guidance and fluoroscopy-guided vertebroplasty procedures. Another phantom was used to compare CBCT-guidance and CT-guidance for inplane, angulated and double angulated needle paths. Multiple studies were performed to evaluate CBCT-guidance in clinical setting (e.g. general (N=145), lungbiopsies (N=84), kidneybiopsies (N=41), type-II endoleak treatment (N=5)). Based on 92 procedures the patient dose was calculated and compared to the dose of 137 CT-guided procedures. The operator dose (hand, collar and gonad region) was measured in a model and during clinical casus. Leaddrapes and ceiling/couch-shielding were used to measure the effect of shielding. By merging a supine-CT with a prone-CBCT the needle planningsoftware was used to determine the movement of the kidney. RESULTS. The mean accuracy using CBCT-guidance is 93%. All procedures have a 100% technical success. The mean proceduretime is 25.2 minutes and the fluoroscopytime is 169.5 seconds. CBCT-guidance has a significant better accuracy then fluoroscopy. Compared to CT-guidance, CBCT-guidance has a significantly better accuracy in complex procedures. The mean outcome for sensitivity, specificity, PPV, NPV, and accuracy was 90.9%, 100%, 100%, 78.1%, and 93.4% respectively. Total mean effective doses with cone-beam CT guidance was between 7.6-16.1 depending of the anatomical location. Effective doses with CT-guidance was 13.0-20.4 mSv. CBCT-guidance results in a significant effective dose reduction of 13%–42%. The mean doses for the hand were 34.2 and 54.6 µSv (thoracic/abdominal respectively). The doses for thyroid and gonad regions were 83.2 and 34.3 µSv in the thoracic, and 66.2 and 47.2 µSv in the abdominal group. Combined shielding reduced dose by 98.2-98.9% (p<0.05). Merging previous CT-data with CBCT is feasible. There is a significant change of the kidney after the transfer from supine to prone position. CONCLUSION. CBCT-guidance is an accurate and safe method for needle interventions, especially usefull in hard-to-reach locations. This technique results in a significant dose reduction… Advisors/Committee Members: Mali, W.P.T.M., Strijen, M.J. van, Heesewijk, J.P.M. van.

Subjects/Keywords: Geneeskunde; Cone-beam CT; CT-guidance; biopsy; outcome; navigationsoftware; effective dose; shielding; merging

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Braak, S. J. (2012). Cone-beam CT-guidance in Interventional Radiology. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/256016

Chicago Manual of Style (16^th Edition):

Braak, S J. “Cone-beam CT-guidance in Interventional Radiology.” 2012. Doctoral Dissertation, Universiteit Utrecht. Accessed January 15, 2021. http://dspace.library.uu.nl:8080/handle/1874/256016.

MLA Handbook (7^th Edition):

Braak, S J. “Cone-beam CT-guidance in Interventional Radiology.” 2012. Web. 15 Jan 2021.

Vancouver:

Braak SJ. Cone-beam CT-guidance in Interventional Radiology. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2012. [cited 2021 Jan 15]. Available from: http://dspace.library.uu.nl:8080/handle/1874/256016.

Council of Science Editors:

Braak SJ. Cone-beam CT-guidance in Interventional Radiology. [Doctoral Dissertation]. Universiteit Utrecht; 2012. Available from: http://dspace.library.uu.nl:8080/handle/1874/256016

University of Adelaide

11. Zhu, Jiahua. Dual energy image reconstruction and systems for application in proton therapy treatment planning.

Degree: 2017, University of Adelaide

URL: http://hdl.handle.net/2440/119696

► Proton therapy is the use of a proton beam rather than a traditional X-ray beam in the treatment of cancer. This technique is being developed… (more)

▼ Proton therapy is the use of a proton beam rather than a traditional X-ray beam in the treatment of cancer. This technique is being developed all over the world due to the unique Bragg peak feature of proton beams. In order to guarantee accurate dose delivery to the tumour, the stopping power ratio (SPR) of the tissue must be known. This parameter is dependent on the electron density and effective atomic number of the material and describes the energy loss per unit length in the tissue. In current clinical practice, the SPR of patient tissues is obtained through single energy CT (SECT) scanning. The SECT scan results in a map of kilovoltage X-ray attenuation coefficients relative to the attenuation coefficient of water for the beam energy. This quantitative information is then converted to SPR via an empirically derived look-up table. If the patient tissues do not have a similar chemical composition to the materials used to generated the look-up table, this approach can lead to diminished dose calculation accuracy. As a result, the patient may experience increased normal tissue complication or decreased tumour control probability. An alternative approach that has been suggested recently is the use of dual energy CT (DECT). DECT is an emerging imaging modality that makes use of CT spectra to create two sets of CT images simultaneously. DECT relies on the energy independence of relative electron density, and the energy and atomic number dependence of X-ray interaction atomic cross-sections. Post processing of the two reconstructed CT images results in two separate images quantifying electron density and effective atomic number. The SPR of the tissue can be calculated once electron density and effective atomic number are known. In theory, the use of DECT for SPR estimation should be more robust than SECT combined with an empirically derived look-up table. This hypothesis has been tested with phantoms of known composition in the current work. Unfortunately, the post processing of DECT images results in effective atomic number images with a low contrast to noise ratio, which can affect SPR calculation accuracy. To counteract this, an iterative DECT image reconstruction approach has been developed. Two image reconstruction algorithms, FBP and TVS-DROP, are implemented to reconstruct the CT images, where an advanced parallel calculation code was designed for TVS-DROP to improve work efficiency. The iterative reconstruction algorithm was also applied to a radioisotope form of cone beam DECT. A feasibility study into the use of this novel imaging method in adaptive proton therapy was conducted. In summary, the objective of this thesis is to examine the application of DECT for proton therapy treatment planning, develop improved image reconstruction techniques for DECT, and investigate the feasibility of a novel radioisotope-based form of cone beam DECT for adaptive proton therapy. Advisors/Committee Members: Penfold, Scott (advisor), Pollard, Judith (advisor), Wilson, Puthenparampil (advisor), School of Physical Sciences (school).

Subjects/Keywords: dual energy CT; dual energy cone beam CT; iterative image reconstruction; Europium-155

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APA (6^th Edition):

Zhu, J. (2017). Dual energy image reconstruction and systems for application in proton therapy treatment planning. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/119696

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhu, Jiahua. “Dual energy image reconstruction and systems for application in proton therapy treatment planning.” 2017. Thesis, University of Adelaide. Accessed January 15, 2021. http://hdl.handle.net/2440/119696.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhu, Jiahua. “Dual energy image reconstruction and systems for application in proton therapy treatment planning.” 2017. Web. 15 Jan 2021.

Vancouver:

Zhu J. Dual energy image reconstruction and systems for application in proton therapy treatment planning. [Internet] [Thesis]. University of Adelaide; 2017. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2440/119696.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhu J. Dual energy image reconstruction and systems for application in proton therapy treatment planning. [Thesis]. University of Adelaide; 2017. Available from: http://hdl.handle.net/2440/119696

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Connecticut

12. Jalali, Elnaz. A Morphological and Volumetric Airway Analysis of Patients with Mandibulofacial Abnormalities Using Cone Beam Computed Tomography.

Degree: Master of Dental Science, Dental Science, 2015, University of Connecticut

URL: https://opencommons.uconn.edu/gs_theses/833

► Introduction: The type and severity of mandibulofacial abnormalities affects the size and shape of the pharynx as patients affected by these conditions often have… (more)

▼ Introduction: The type and severity of mandibulofacial abnormalities affects the size and shape of the pharynx as patients affected by these conditions often have complaints of snoring and respiratory difficulties during sleep. Purpose: The objectives of this study were to evaluate the volume and morphology of nasopharyngeal, oropharyngeal, hypopharyngeal and the total airway of patients affected by mandibulofacial abnormalities (unilateral cleft lip and palate [UCLP], and craniometaphyseal dysplasia [CMD]) and to compare them with a matched control group without any mandibulofacial abnormalities. Methods: Cone-beam computed tomography (CBCT) records of 80 patients (30 UCLP and 10 CMD along with 40 age and gender-matched controls) were collected. Volumetric analysis was performed using image segmentation features in MIMICS 15.0 (Materialise, Levuen, Belgium) to evaluate the nasopharyngeal, oropharyngeal, hypopharyngeal and total airway volumes, as well as the airway morphology. Minimum cross-sectional area was determined using InVivo Dental 5.3 (Anatomage, San Jose, California). Statistical analysis with SPSS 22.0 (IBM, Armonk, NY) was done to evaluate inter- and intra-operator reliability by using Cronbach's alpha and paired t-test. Results: Patients affected by UCLP had statistically significant smaller naso-, hypopharyngeal and total airway volumes, smaller minimum cross-section area, and a more circularly shaped oropharynx when compared with the controls. The CMD group presented the same airway shape as UCLP patients and statistically significant smaller volumes of all pharyngeal regions as well as total airway and minimum cross-section area when compared with the controls. Conclusion: Individuals with UCLP and CMD had a different pharyngeal airway shape and smaller pharyngeal volumes compared to the controls. These individuals have more susceptibility of developing sleep related breathing disorders. This information is pivotal for the clinician in defining the best possible treatment choice for each patient, thus avoiding procedures that could further compromise the airway. Advisors/Committee Members: Dr. Alan Lurie, Dr. Sumit Yadav, Dr. Aditya Tadinada.

Subjects/Keywords: Morphological; Volumetric; Airway; Mandibulofacial; Abnormality; Cone Beam CT

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APA (6^th Edition):

Jalali, E. (2015). A Morphological and Volumetric Airway Analysis of Patients with Mandibulofacial Abnormalities Using Cone Beam Computed Tomography. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/833

Chicago Manual of Style (16^th Edition):

Jalali, Elnaz. “A Morphological and Volumetric Airway Analysis of Patients with Mandibulofacial Abnormalities Using Cone Beam Computed Tomography.” 2015. Masters Thesis, University of Connecticut. Accessed January 15, 2021. https://opencommons.uconn.edu/gs_theses/833.

MLA Handbook (7^th Edition):

Jalali, Elnaz. “A Morphological and Volumetric Airway Analysis of Patients with Mandibulofacial Abnormalities Using Cone Beam Computed Tomography.” 2015. Web. 15 Jan 2021.

Vancouver:

Jalali E. A Morphological and Volumetric Airway Analysis of Patients with Mandibulofacial Abnormalities Using Cone Beam Computed Tomography. [Internet] [Masters thesis]. University of Connecticut; 2015. [cited 2021 Jan 15]. Available from: https://opencommons.uconn.edu/gs_theses/833.

Council of Science Editors:

Jalali E. A Morphological and Volumetric Airway Analysis of Patients with Mandibulofacial Abnormalities Using Cone Beam Computed Tomography. [Masters Thesis]. University of Connecticut; 2015. Available from: https://opencommons.uconn.edu/gs_theses/833

University of Manchester

13. Wadeson, Nicola Lisa. Modelling and Correction of Scatter in a Switched Source Multi-Ring Detector X-ray CT machine.

Degree: 2011, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:125710

► The RTT80 cone beam x-ray computed tomography system, developed by Rapiscan Systems Ltd, uses switched x-ray sources and fixed offset detector rings to remove the… (more)

Subjects/Keywords: X-ray cone beam CT; RTT; Monte Carlo; Geant4; Scatter correction

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APA (6^th Edition):

Wadeson, N. L. (2011). Modelling and Correction of Scatter in a Switched Source Multi-Ring Detector X-ray CT machine. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:125710

Chicago Manual of Style (16^th Edition):

Wadeson, Nicola Lisa. “Modelling and Correction of Scatter in a Switched Source Multi-Ring Detector X-ray CT machine.” 2011. Doctoral Dissertation, University of Manchester. Accessed January 15, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:125710.

MLA Handbook (7^th Edition):

Wadeson, Nicola Lisa. “Modelling and Correction of Scatter in a Switched Source Multi-Ring Detector X-ray CT machine.” 2011. Web. 15 Jan 2021.

Vancouver:

Wadeson NL. Modelling and Correction of Scatter in a Switched Source Multi-Ring Detector X-ray CT machine. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Jan 15]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:125710.

Council of Science Editors:

Wadeson NL. Modelling and Correction of Scatter in a Switched Source Multi-Ring Detector X-ray CT machine. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:125710

University of Toronto

14. Lukat, Tricia. Limited Field-of-view Cone Beam CT Imaging of the Temporomandibular Joint: Comparative Dosimetry and Diagnostic Efficacy.

Degree: 2013, University of Toronto

URL: http://hdl.handle.net/1807/43096

►

Imaging of the osseous structures of the temporomandibular joint is best accomplished using computed tomography (CT). Cone beam CT offers a reduced radiation dose and… (more)

Subjects/Keywords: temporomandibular joint; cone beam CT; dosimetry; spatial resolution; 0567

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APA (6^th Edition):

Lukat, T. (2013). Limited Field-of-view Cone Beam CT Imaging of the Temporomandibular Joint: Comparative Dosimetry and Diagnostic Efficacy. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/43096

Chicago Manual of Style (16^th Edition):

Lukat, Tricia. “Limited Field-of-view Cone Beam CT Imaging of the Temporomandibular Joint: Comparative Dosimetry and Diagnostic Efficacy.” 2013. Masters Thesis, University of Toronto. Accessed January 15, 2021. http://hdl.handle.net/1807/43096.

MLA Handbook (7^th Edition):

Lukat, Tricia. “Limited Field-of-view Cone Beam CT Imaging of the Temporomandibular Joint: Comparative Dosimetry and Diagnostic Efficacy.” 2013. Web. 15 Jan 2021.

Vancouver:

Lukat T. Limited Field-of-view Cone Beam CT Imaging of the Temporomandibular Joint: Comparative Dosimetry and Diagnostic Efficacy. [Internet] [Masters thesis]. University of Toronto; 2013. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1807/43096.

Council of Science Editors:

Lukat T. Limited Field-of-view Cone Beam CT Imaging of the Temporomandibular Joint: Comparative Dosimetry and Diagnostic Efficacy. [Masters Thesis]. University of Toronto; 2013. Available from: http://hdl.handle.net/1807/43096

University of Toronto

15. Amintavakoli, Niloufar. The Effect of Cone Beam CT Voxel Size on the Identification of Vertical and Horizontal Root Fractures: An In-vitro Study.

Degree: 2013, University of Toronto

URL: http://hdl.handle.net/1807/42669

►

Objective: The purpose of this study is to determine the relationship between cone beam CT (CBCT) voxel size and tooth root fracture detection. Materials and… (more)

Subjects/Keywords: root fractures; cone beam CT; voxel size; 0567

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APA (6^th Edition):

Amintavakoli, N. (2013). The Effect of Cone Beam CT Voxel Size on the Identification of Vertical and Horizontal Root Fractures: An In-vitro Study. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/42669

Chicago Manual of Style (16^th Edition):

Amintavakoli, Niloufar. “The Effect of Cone Beam CT Voxel Size on the Identification of Vertical and Horizontal Root Fractures: An In-vitro Study.” 2013. Masters Thesis, University of Toronto. Accessed January 15, 2021. http://hdl.handle.net/1807/42669.

MLA Handbook (7^th Edition):

Amintavakoli, Niloufar. “The Effect of Cone Beam CT Voxel Size on the Identification of Vertical and Horizontal Root Fractures: An In-vitro Study.” 2013. Web. 15 Jan 2021.

Vancouver:

Amintavakoli N. The Effect of Cone Beam CT Voxel Size on the Identification of Vertical and Horizontal Root Fractures: An In-vitro Study. [Internet] [Masters thesis]. University of Toronto; 2013. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1807/42669.

Council of Science Editors:

Amintavakoli N. The Effect of Cone Beam CT Voxel Size on the Identification of Vertical and Horizontal Root Fractures: An In-vitro Study. [Masters Thesis]. University of Toronto; 2013. Available from: http://hdl.handle.net/1807/42669

16. 前本, 均. Predictive factors of uterine movement during definitive radiotherapy for cervical cancer : 子宮頸癌根治的放射線治療期間中の子宮移動の予測因子について.

Degree: 博士(医学), 2017, University of the Ryukyus / 琉球大学

URL: http://hdl.handle.net/20.500.12000/36587

► To determine the predictive factors affecting uterine movement during radiotherapy (RT), we quantified interfractionuterine movement using computed tomography (CT) and cone-beam CT (CBCT). A total… (more)

Subjects/Keywords: cervical cancer; radiotherapy; computed tomography; uterus; cone-beam CT

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APA (6^th Edition):

前本, �. (2017). Predictive factors of uterine movement during definitive radiotherapy for cervical cancer : 子宮頸癌根治的放射線治療期間中の子宮移動の予測因子について. (Thesis). University of the Ryukyus / 琉球大学. Retrieved from http://hdl.handle.net/20.500.12000/36587

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

前本, 均. “Predictive factors of uterine movement during definitive radiotherapy for cervical cancer : 子宮頸癌根治的放射線治療期間中の子宮移動の予測因子について.” 2017. Thesis, University of the Ryukyus / 琉球大学. Accessed January 15, 2021. http://hdl.handle.net/20.500.12000/36587.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

前本, 均. “Predictive factors of uterine movement during definitive radiotherapy for cervical cancer : 子宮頸癌根治的放射線治療期間中の子宮移動の予測因子について.” 2017. Web. 15 Jan 2021.

Vancouver:

前本 �. Predictive factors of uterine movement during definitive radiotherapy for cervical cancer : 子宮頸癌根治的放射線治療期間中の子宮移動の予測因子について. [Internet] [Thesis]. University of the Ryukyus / 琉球大学; 2017. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/20.500.12000/36587.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

前本 �. Predictive factors of uterine movement during definitive radiotherapy for cervical cancer : 子宮頸癌根治的放射線治療期間中の子宮移動の予測因子について. [Thesis]. University of the Ryukyus / 琉球大学; 2017. Available from: http://hdl.handle.net/20.500.12000/36587

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

17. Rogers, Timothy J. Clinical and Radiographic Methods to Find the Second Mesiobuccal Canal in Maxillary Molars.

Degree: 2013, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/10237

► A retrospective clinical study was carried out to determine if cone beam volumetric tomography (CBVT) would aid the practitioner in locating the second mesiobuccal canal… (more)

Subjects/Keywords: cone beam ct; mesiobuccal; maxillary molar; cbct; MB2; second mesiobuccal

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APA (6^th Edition):

Rogers, T. J. (2013). Clinical and Radiographic Methods to Find the Second Mesiobuccal Canal in Maxillary Molars. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/10237

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rogers, Timothy J. “Clinical and Radiographic Methods to Find the Second Mesiobuccal Canal in Maxillary Molars.” 2013. Thesis, University of Illinois – Chicago. Accessed January 15, 2021. http://hdl.handle.net/10027/10237.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rogers, Timothy J. “Clinical and Radiographic Methods to Find the Second Mesiobuccal Canal in Maxillary Molars.” 2013. Web. 15 Jan 2021.

Vancouver:

Rogers TJ. Clinical and Radiographic Methods to Find the Second Mesiobuccal Canal in Maxillary Molars. [Internet] [Thesis]. University of Illinois – Chicago; 2013. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10027/10237.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rogers TJ. Clinical and Radiographic Methods to Find the Second Mesiobuccal Canal in Maxillary Molars. [Thesis]. University of Illinois – Chicago; 2013. Available from: http://hdl.handle.net/10027/10237

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

18. Tsui, Tiffany. Patient studies on shading correction for cone-beam computed tomography images.

Degree: MS, Mechanical Engineering, 2015, Georgia Tech

URL: http://hdl.handle.net/1853/60388

► The work performed and presented in this thesis explores the efficacy of using planning Computed Tomography (CT) images as prior knowledge to improve quantitative cone-beam… (more)

▼ The work performed and presented in this thesis explores the efficacy of using planning Computed Tomography (CT) images as prior knowledge to improve quantitative cone-beam CT (CBCT) image quality in radiation therapy. CBCT is a significant component in the treatment planning process of image-guided radiation therapy (IGRT). Current CBCT images have various shading artifacts such as scatter, noise, and non-uniformity that create challenges in accurately identifying tissue abnormalities and reduce their usefulness for clinical applications. This thesis proposes a method to enhance the CBCT image quality when using commercial image correction methods (i.e. images corrected by a Varian algorithm). The results show that scattering and image non-uniformity are greatly reduced by the proposed method. Therefore, the proposed method achieves better image correction results than does the Varian correction algorithm. Since all patients who receive radiation treatment routinely undergo a multiple detector array CT (MDCT) scan as part of the diagnostic procedure, the high quality MDCT serves as the “free” planning CT (pCT). To improve the CBCT images that are taken during radiation treatment, the CBCT is first spatially registered with the pCT via rigid and deformable registration using Velocity software. Primary projections in the CBCT scan are estimated via forward projections of the registered MDCT image. The low frequency errors in the projections, which are a major cause of shading artifacts in CBCT images after reconstruction, are estimated by filtering the difference between the original line integral and the estimated scatter projections. The corrected CBCT image is then reconstructed from the projections using the Feldkamp, Davis, and Kress (FDK) algorithm. With the planning MDCT treated as ground truth, the CBCT image corrected by the proposed method is compared against the corrected image using the Varian Medical Systems (VMS) algorithm, a commonly used commercial shading correction method. The results are presented in the axial, coronal, and sagittal views, and are evaluated by comparing the mean number of error for three image quality evaluation factors - CT number, spatial non-uniformity (SNU) value, and image contrast value. A paired t-test is performed on the results to prove the consistency and reliability of the proposed method of shading correction. The proposed method is evaluated on 20 sets of thorax and pelvis cancer patient data from Cancer Treatment Centers of America (CTCA). CT numbers, measured in Hounsfield units (HU), for four uniformly selected regions of interests (ROIs) are found in each set of images. The mean errors in CT number, SNU, and contrast value for the Varian corrected image and the image corrected by the proposed method are 53 HU and 41 HU, 7.3% and 3.0%, and 37 HU and 34 HU respectively. The results show that as compared to the Varian correction algorithm the proposed method delivers a CBCT image quality with better spatial uniformity and fewer CT number errors at the 95% confidence… Advisors/Committee Members: Zhu, Lei (advisor), Elder, Eric (committee member), Roper, Justin (committee member).

Subjects/Keywords: Cone-beam CT; Image correction; Scatter correction; Patient studies

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APA (6^th Edition):

Tsui, T. (2015). Patient studies on shading correction for cone-beam computed tomography images. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/60388

Chicago Manual of Style (16^th Edition):

Tsui, Tiffany. “Patient studies on shading correction for cone-beam computed tomography images.” 2015. Masters Thesis, Georgia Tech. Accessed January 15, 2021. http://hdl.handle.net/1853/60388.

MLA Handbook (7^th Edition):

Tsui, Tiffany. “Patient studies on shading correction for cone-beam computed tomography images.” 2015. Web. 15 Jan 2021.

Vancouver:

Tsui T. Patient studies on shading correction for cone-beam computed tomography images. [Internet] [Masters thesis]. Georgia Tech; 2015. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1853/60388.

Council of Science Editors:

Tsui T. Patient studies on shading correction for cone-beam computed tomography images. [Masters Thesis]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/60388

Macquarie University

19. Alnafjan, Fadwa. Improving the clinical applicability of electrophysiological assessments and cochlear imaging in adult cochlear implant patients.

Degree: 2017, Macquarie University

URL: http://hdl.handle.net/1959.14/1265201

►

Empirical thesis.

"Audiology Section, Department of Linguistics, Faculty of Human Sciences, Macquarie University, Sydney, Australia" – title page.

Bibliography: pages 113-141.

Chapter 1. Introduction –… (more)

▼

Empirical thesis.

"Audiology Section, Department of Linguistics, Faculty of Human Sciences, Macquarie University, Sydney, Australia" – title page.

Bibliography: pages 113-141.

Chapter 1. Introduction – Chapter 2. Cost and reported benefits of electrophysiology testing during cochlear implant surgery – Chapter 3. Developing a method for assessing the integrity of electrically-evoked auditory brainstem response (eABR) measures – Chapter 4. A clinically feasible technique of assessing scalar location of cochlear implant basal electrodes using Cone Beam Computed Tomography – Chapter 5. Assessing cochlear length using Cone Beam Computed Tomography in adults with cochlear implants – Chapter 6. General discussion, results and conclusion – References – Appendix.

Cochlear implants (CI) are recognized as the most successful neural prosthesis to date. With the technology and surgical techniques for implantation continually improving, the potential for improved speech perception abilities in individuals with severe-to-profound hearing loss, also increases. While different factors which influence these outcomes have been identified, no consensus exists regarding the degree to which each factor contributes (see Holden et al., (2013)). A major challenge of using speech perception scores to evaluate cochlear implantation outcomes is that understanding degraded (such as vocoded speech from a cochlear implant) speech uses both linguistic and cognitive resources (working memory and attention). Therefore, it is not a sensitive outcome measure for assessing minor technological or surgical modifications for the implant. On the other hand, electrophysiological measures of auditory function, such as electrically evoked auditory brainstem responses (eABRs) could provide a more sensitive measure of the effects of electrode positioning, surgical outcomes, or cochlear neural integrity. However, a robust understanding of how these measures could be used to inform functional outcomes of implantation has not yet been reached.

The research reported in this thesis is based on an online questionnaire data from clinical audiologists working at the Sydney Cochlear Implant Centre (SCIC) in NSW and retrospective datasets collected from the centre, which has a long history of measuring objective responses intra-operatively during cochlear implantation surgery. This thesis firstly explores the current clinical use of these objective measures by the clinical audiologists, then investigates the potential clinical utility of imaging and intraoperative electrophysiological measures in CI to increase test battery efficiency and applicability. Further, this thesis describes a clinically viable tool of measuring cochlear length using Cone beam Computed Tomography (CBCT) with the implant array in situ, providing a more accurate method of measuring cochlear lengths and thereby provides insights into a variable which influences final electrode placement.

results of these investigations demonstrate that considerably greater clinical use…

Advisors/Committee Members: Macquarie University. Department of Linguistics.

Subjects/Keywords: Cochlear implants; Ear – Tomography; cochlear implants; electrophysiology; Cone Beam CT

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alnafjan, F. (2017). Improving the clinical applicability of electrophysiological assessments and cochlear imaging in adult cochlear implant patients. (Doctoral Dissertation). Macquarie University. Retrieved from http://hdl.handle.net/1959.14/1265201

Chicago Manual of Style (16^th Edition):

Alnafjan, Fadwa. “Improving the clinical applicability of electrophysiological assessments and cochlear imaging in adult cochlear implant patients.” 2017. Doctoral Dissertation, Macquarie University. Accessed January 15, 2021. http://hdl.handle.net/1959.14/1265201.

MLA Handbook (7^th Edition):

Alnafjan, Fadwa. “Improving the clinical applicability of electrophysiological assessments and cochlear imaging in adult cochlear implant patients.” 2017. Web. 15 Jan 2021.

Vancouver:

Alnafjan F. Improving the clinical applicability of electrophysiological assessments and cochlear imaging in adult cochlear implant patients. [Internet] [Doctoral dissertation]. Macquarie University; 2017. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1959.14/1265201.

Council of Science Editors:

Alnafjan F. Improving the clinical applicability of electrophysiological assessments and cochlear imaging in adult cochlear implant patients. [Doctoral Dissertation]. Macquarie University; 2017. Available from: http://hdl.handle.net/1959.14/1265201

University of Toronto

20. Fox, Aaron. The Performance of a Zirconium-based Root-Filling Material with Artifact-Reduction Properties in the Detection of Artificially Induced Root Fractures Using Cone Beam CT Imaging.

Degree: 2018, University of Toronto

URL: http://hdl.handle.net/1807/89582

►

Objectives: To describe a novel technique for characterizing beam hardening artifact (BHA) using cone-beam computed tomography (CBCT); and to evaluate the influence of the Zirconium-based… (more)

Subjects/Keywords: Beam hardening artifact; Cone beam CT; Gutta percha; K absorption egde; Zirconium; 0567

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APA (6^th Edition):

Fox, A. (2018). The Performance of a Zirconium-based Root-Filling Material with Artifact-Reduction Properties in the Detection of Artificially Induced Root Fractures Using Cone Beam CT Imaging. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/89582

Chicago Manual of Style (16^th Edition):

Fox, Aaron. “The Performance of a Zirconium-based Root-Filling Material with Artifact-Reduction Properties in the Detection of Artificially Induced Root Fractures Using Cone Beam CT Imaging.” 2018. Masters Thesis, University of Toronto. Accessed January 15, 2021. http://hdl.handle.net/1807/89582.

MLA Handbook (7^th Edition):

Fox, Aaron. “The Performance of a Zirconium-based Root-Filling Material with Artifact-Reduction Properties in the Detection of Artificially Induced Root Fractures Using Cone Beam CT Imaging.” 2018. Web. 15 Jan 2021.

Vancouver:

Fox A. The Performance of a Zirconium-based Root-Filling Material with Artifact-Reduction Properties in the Detection of Artificially Induced Root Fractures Using Cone Beam CT Imaging. [Internet] [Masters thesis]. University of Toronto; 2018. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1807/89582.

Council of Science Editors:

Fox A. The Performance of a Zirconium-based Root-Filling Material with Artifact-Reduction Properties in the Detection of Artificially Induced Root Fractures Using Cone Beam CT Imaging. [Masters Thesis]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/89582

University of Toronto

21. Phaneuf, Tyler. Effectiveness of Software-enhanced CBCT-image Artifact Reduction Software.

Degree: 2020, University of Toronto

URL: http://hdl.handle.net/1807/103682

►

Objectives: The purpose of this study is to quantify the degree of BH artifact production and evaluate the effectiveness of AR software in two CBCT… (more)

Subjects/Keywords: Artifact Reduction; Artifacts; Beam Hardening; CBCT; Cone Beam CT; root fillings; 0567

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Phaneuf, T. (2020). Effectiveness of Software-enhanced CBCT-image Artifact Reduction Software. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/103682

Chicago Manual of Style (16^th Edition):

Phaneuf, Tyler. “Effectiveness of Software-enhanced CBCT-image Artifact Reduction Software.” 2020. Masters Thesis, University of Toronto. Accessed January 15, 2021. http://hdl.handle.net/1807/103682.

MLA Handbook (7^th Edition):

Phaneuf, Tyler. “Effectiveness of Software-enhanced CBCT-image Artifact Reduction Software.” 2020. Web. 15 Jan 2021.

Vancouver:

Phaneuf T. Effectiveness of Software-enhanced CBCT-image Artifact Reduction Software. [Internet] [Masters thesis]. University of Toronto; 2020. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1807/103682.

Council of Science Editors:

Phaneuf T. Effectiveness of Software-enhanced CBCT-image Artifact Reduction Software. [Masters Thesis]. University of Toronto; 2020. Available from: http://hdl.handle.net/1807/103682

22. Wang, Yi. High Detective Quantum Efficiency Electronic Portal Imaging Devices Based on Segmented Crystalline Scintillators and Mercuric Iodide Photoconductors.

Degree: PhD, Biomedical Engineering, 2009, University of Michigan

URL: http://hdl.handle.net/2027.42/63728

► Electronic portal imaging devices (EPIDs) based on active matrix, flat-panel imagers (AMFPIs) have been widely used for patient set-up verification in radiotherapy, and are being… (more)

▼ Electronic portal imaging devices (EPIDs) based on active matrix, flat-panel imagers (AMFPIs) have been widely used for patient set-up verification in radiotherapy, and are being investigated for megavoltage (MV) cone-beam computed tomography (CBCT). However, the performance of conventional AMFPI-based EPIDs is limited by their relatively low detective quantum efficiency (DQE) at radiotherapy energies, ~1% for 6 MV X rays. Consequently, MV CBCT carried out with these inefficient EPIDs requires impractically high doses to achieve soft-tissue visualization. In order to significantly improve DQE, this research work examined thick mercuric iodide (HgI2) photoconductors in the form of particle in binder (PIB) and thick, segmented scintillators consisting of 2D matrices of scintillating crystals separated by septal walls. Through simulation of radiation transport, quantum efficiency (QE), modulation transfer function (MTF) and DQE were studied as a function of the thickness of PIB-HgI2 photoconductors. Simulations of radiation and optical transport were carried out to investigate how various geometric and optical properties affect the DQE for segmented CsI:Tl and BGO scintillators. Four prototype EPIDs, employing three CsI:Tl scintillators (11.4, 25.6 and 40.0 mm thick) and one BGO scintillator (11.3 mm thick), were evaluated using a 6 MV photon beam. Finally, the potential MV CBCT performance provided by segmented scintillators was investigated by simulation of radiation transport. Compared to conventional EPIDs, PIB-HgI2 photoconductors up to 6 mm thick have the potential to provide up to a factor of ~5 improvement in DQE. Segmented CsI:Tl and BGO scintillators up to 40 mm thick can provide DQE improvement of up to a factor of ~29 and 42, respectively, through optimization of optical properties. The three CsI:Tl prototypes demonstrated DQE improvement of up to a factor of ~25 at low spatial frequencies, while the BGO prototype exhibited an improvement of a factor of ~20 at zero frequency and over a factor of ~10 at the Nyquist frequency. The simulation results indicate that CsI:Tl and BGO scintillators up to 40 mm thick can provide dose reduction for MV CBCT of up to a factor of ~51 and 59, respectively, creating the possibility of providing soft-tissue visualization at clinically acceptable doses. Advisors/Committee Members: Antonuk, Larry E. (committee member), Rogers, W. Leslie (committee member), Clarke, Roy (committee member), Clinthorne, Neal H. (committee member).

Subjects/Keywords: Active Matrix, Flat-panel Imager; Electronic Portal Imaging Devices; Megavoltage Cone-beam CT; Segmented Crystalline Scintillators;

…such as tomosynthesis and cone-beam CT. In general, an AMFPI system consists of four… …cone-beam CT. For example, in a Monte Carlo study of radiation transport, Keller et al… …amorphous silicon BGO Bismuth Germanate CBCT Cone-beam computed tomography cGy Centigray… …photon beam therapy and megavoltage (MV) x-ray imaging is reviewed in this chapter… …beam CT (CBCT) images in the treatment room. The last few years have witnessed the…

11 more images…

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APA (6^th Edition):

Wang, Y. (2009). High Detective Quantum Efficiency Electronic Portal Imaging Devices Based on Segmented Crystalline Scintillators and Mercuric Iodide Photoconductors. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/63728

Chicago Manual of Style (16^th Edition):

Wang, Yi. “High Detective Quantum Efficiency Electronic Portal Imaging Devices Based on Segmented Crystalline Scintillators and Mercuric Iodide Photoconductors.” 2009. Doctoral Dissertation, University of Michigan. Accessed January 15, 2021. http://hdl.handle.net/2027.42/63728.

MLA Handbook (7^th Edition):

Wang, Yi. “High Detective Quantum Efficiency Electronic Portal Imaging Devices Based on Segmented Crystalline Scintillators and Mercuric Iodide Photoconductors.” 2009. Web. 15 Jan 2021.

Vancouver:

Wang Y. High Detective Quantum Efficiency Electronic Portal Imaging Devices Based on Segmented Crystalline Scintillators and Mercuric Iodide Photoconductors. [Internet] [Doctoral dissertation]. University of Michigan; 2009. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2027.42/63728.

Council of Science Editors:

Wang Y. High Detective Quantum Efficiency Electronic Portal Imaging Devices Based on Segmented Crystalline Scintillators and Mercuric Iodide Photoconductors. [Doctoral Dissertation]. University of Michigan; 2009. Available from: http://hdl.handle.net/2027.42/63728

23. Gama, Renata de Saldanha da. Acurácia de medidas lineares em região posterior de mandíbulas obtidas por tomografia computadorizada de feixe cônico através de diferentes protocolos de aquisição.

Degree: Mestrado, Diagnóstico Bucal, 2013, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/23/23139/tde-18102013-185639/ ;

►

A utilização da tomografia computadorizada de feixe cônico (TCFC) permite avaliar a altura e espessura do osso remanescente para a instalação de implantes. As mandíbulas… (more)

Subjects/Keywords: Accuracy; Acurácia; Cone Beam CT; Tomografia; Tomografia Computadorizada de Feixe Cônico; Tomography

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gama, R. d. S. d. (2013). Acurácia de medidas lineares em região posterior de mandíbulas obtidas por tomografia computadorizada de feixe cônico através de diferentes protocolos de aquisição. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/23/23139/tde-18102013-185639/ ;

Chicago Manual of Style (16^th Edition):

Gama, Renata de Saldanha da. “Acurácia de medidas lineares em região posterior de mandíbulas obtidas por tomografia computadorizada de feixe cônico através de diferentes protocolos de aquisição.” 2013. Masters Thesis, University of São Paulo. Accessed January 15, 2021. http://www.teses.usp.br/teses/disponiveis/23/23139/tde-18102013-185639/ ;.

MLA Handbook (7^th Edition):

Gama, Renata de Saldanha da. “Acurácia de medidas lineares em região posterior de mandíbulas obtidas por tomografia computadorizada de feixe cônico através de diferentes protocolos de aquisição.” 2013. Web. 15 Jan 2021.

Vancouver:

Gama RdSd. Acurácia de medidas lineares em região posterior de mandíbulas obtidas por tomografia computadorizada de feixe cônico através de diferentes protocolos de aquisição. [Internet] [Masters thesis]. University of São Paulo; 2013. [cited 2021 Jan 15]. Available from: http://www.teses.usp.br/teses/disponiveis/23/23139/tde-18102013-185639/ ;.

Council of Science Editors:

Gama RdSd. Acurácia de medidas lineares em região posterior de mandíbulas obtidas por tomografia computadorizada de feixe cônico através de diferentes protocolos de aquisição. [Masters Thesis]. University of São Paulo; 2013. Available from: http://www.teses.usp.br/teses/disponiveis/23/23139/tde-18102013-185639/ ;

University of Connecticut

24. Mathew, Reji T. Cone Beam Computerized Tomography Analysis of Haller cell : Prevalence and Clinical Significance.

Degree: Master of Dental Science, Dental Science, 2011, University of Connecticut

URL: https://opencommons.uconn.edu/gs_theses/127

► Introduction Albert von Haller described Haller cells (HC) as anterior ethmoidal cells along orbital floor and above maxillary sinus ostium. Location of HC could… (more)

Subjects/Keywords: Haller Cell; Maxillary sinusitis; Maxillary sinus ostium; Orbital dehiscence; Cone Beam CT

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mathew, R. T. (2011). Cone Beam Computerized Tomography Analysis of Haller cell : Prevalence and Clinical Significance. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/127

Chicago Manual of Style (16^th Edition):

Mathew, Reji T. “Cone Beam Computerized Tomography Analysis of Haller cell : Prevalence and Clinical Significance.” 2011. Masters Thesis, University of Connecticut. Accessed January 15, 2021. https://opencommons.uconn.edu/gs_theses/127.

MLA Handbook (7^th Edition):

Mathew, Reji T. “Cone Beam Computerized Tomography Analysis of Haller cell : Prevalence and Clinical Significance.” 2011. Web. 15 Jan 2021.

Vancouver:

Mathew RT. Cone Beam Computerized Tomography Analysis of Haller cell : Prevalence and Clinical Significance. [Internet] [Masters thesis]. University of Connecticut; 2011. [cited 2021 Jan 15]. Available from: https://opencommons.uconn.edu/gs_theses/127.

Council of Science Editors:

Mathew RT. Cone Beam Computerized Tomography Analysis of Haller cell : Prevalence and Clinical Significance. [Masters Thesis]. University of Connecticut; 2011. Available from: https://opencommons.uconn.edu/gs_theses/127

Syracuse University

25. Vogelsang, Levon Orion. Development of Spect and Ct Tomographic Image Reconstruction.

Degree: PhD, Physics, 2012, Syracuse University

URL: https://surface.syr.edu/phy_etd/124

► The purpose of this study was to contribute to the advancement of statistically-based iterative reconstruction algorithms and protocols for both SPECT and micro CT… (more)

▼ The purpose of this study was to contribute to the advancement of statistically-based iterative reconstruction algorithms and protocols for both SPECT and micro CT data. Major contributions of this work to SPECT reconstruction include formulation and implementation of fully three-dimensional voxel-based system matrix in parallel-beam, fan-beam, and cone-beam collimator geometries while modeling the process of attenuation, system resolution and sensitivity. This is achieved by casting rays through a volume of voxels and using ray-voxel intersection lengths to determine approximate volume contributions. Qualitative and quantitative analysis of reconstructed Monte Carlo data sets show that this is a very effective and efficient method. Using this method, three SPECT studies were conducted. First, the reconstruction performance was studied for a triple-head cone-beam SPECT system using a helical orbit acquisition. We looked at various subset groupings for the ordered-subsets expectation maximization (OSEM) algorithm. We also examined how rotational and translational sampling affects reconstructed image quality when constrained by total injected dose and scan time. We conclude the following: When reconstructing noiseless datasets, varying the rotational sampling from 90 views to 360 views over 360 degrees does not affect the reconstructed activity regardless of the object size in terms of both convergence and accuracy. When using ordered subsets, the subset group arrangement is important in terms of both image quality and accuracy. The smaller the object is that is being reconstructed, the rate of convergence decreases, the spatial resolution decreases, and accuracy decreases. Second, we examined a system composed of three, possibly different, converging collimators using a circular orbit. We conclude the following: When reconstructing noiseless datasets, using a triple-cone beam system resulted in distortion artifacts along the axial direction and diminished resolution along the transaxial direction. Using a triple-fan beam system resulted in the best reconstructed image quality in terms of bias, noise, and contrast. When noisy datasets were reconstructed, a cone-cone-fan beam system resulted in best reconstructed image quality in terms of mean-to-actual ratio for small lesions and a triple-fan beam system for large lesions. Finally, a two-dimensional mesh-based system matrix for parallel-beam collimation with attenuation and resolution modeling was designed, implemented, and studied. We conclude that no more than two divisions per detector bin width are needed for satisfactory reconstruction. Also, using more than two divisions per detector bin does not significantly improve reconstructed images. A chapter on iterative micro-CT reconstruction is also included. Our contribution to micro-CT reconstruction is the formulation and implementation of a cone-beam system matrix that reduces ring artifacts associated with sampling of the reconstruction space. This new approach reduces the… Advisors/Committee Members: Andrzej Krol, Edward Lipson.

Subjects/Keywords: Cone Beam; Mesh; Micro CT; SPECT; System Matrix; Tomographic Image Reconstruction; Physics

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APA (6^th Edition):

Vogelsang, L. O. (2012). Development of Spect and Ct Tomographic Image Reconstruction. (Doctoral Dissertation). Syracuse University. Retrieved from https://surface.syr.edu/phy_etd/124

Chicago Manual of Style (16^th Edition):

Vogelsang, Levon Orion. “Development of Spect and Ct Tomographic Image Reconstruction.” 2012. Doctoral Dissertation, Syracuse University. Accessed January 15, 2021. https://surface.syr.edu/phy_etd/124.

MLA Handbook (7^th Edition):

Vogelsang, Levon Orion. “Development of Spect and Ct Tomographic Image Reconstruction.” 2012. Web. 15 Jan 2021.

Vancouver:

Vogelsang LO. Development of Spect and Ct Tomographic Image Reconstruction. [Internet] [Doctoral dissertation]. Syracuse University; 2012. [cited 2021 Jan 15]. Available from: https://surface.syr.edu/phy_etd/124.

Council of Science Editors:

Vogelsang LO. Development of Spect and Ct Tomographic Image Reconstruction. [Doctoral Dissertation]. Syracuse University; 2012. Available from: https://surface.syr.edu/phy_etd/124

University of Debrecen

26. Füry, Szilvia. Cone Beam CT szerepe a fogászati radiológiában .

Degree: DE – Általános Orvostudományi Kar, University of Debrecen

URL: http://hdl.handle.net/2437/213819

► Diplomadolgozatom célja a fogászati radiológia jelenleg legfejlettebb képalkotó eljárása, a Cone Beam CT bemutatása, amely a fogászat és a szájsebészet számos területén egyre fontosabb szerepet… (more)

Subjects/Keywords: cone beam CT; implantológia; endodoncia; orthodoncia

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APA (6^th Edition):

Füry, S. (n.d.). Cone Beam CT szerepe a fogászati radiológiában . (Thesis). University of Debrecen. Retrieved from http://hdl.handle.net/2437/213819

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Füry, Szilvia. “Cone Beam CT szerepe a fogászati radiológiában .” Thesis, University of Debrecen. Accessed January 15, 2021. http://hdl.handle.net/2437/213819.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Füry, Szilvia. “Cone Beam CT szerepe a fogászati radiológiában .” Web. 15 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Füry S. Cone Beam CT szerepe a fogászati radiológiában . [Internet] [Thesis]. University of Debrecen; [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2437/213819.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

Füry S. Cone Beam CT szerepe a fogászati radiológiában . [Thesis]. University of Debrecen; Available from: http://hdl.handle.net/2437/213819

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

University of California – San Francisco

27. Ulrich, Beau. A Novel Analysis of Skeletal Asymmetry Utilizing 3D CBCT Technology: The Ulrich Analysis.

Degree: Oral and Craniofacial Sciences, 2012, University of California – San Francisco

URL: http://www.escholarship.org/uc/item/14q55139

► Introduction: Proper diagnosis and treatment planning is essential to the outcome of orthodontic therapy with accurate diagnostic records being the pinnacle of that process. Previously,… (more)

▼ Introduction: Proper diagnosis and treatment planning is essential to the outcome of orthodontic therapy with accurate diagnostic records being the pinnacle of that process. Previously, two-dimensional imagery has been the standard in analyzing or visualizing a patient for skeletal asymmetries but has numerous limiting factors. The limitations that two dimensional analyses face can be solved by the use of three-dimensional cone beam computed tomography (CBCT) when combined with an efficient and relevant analysis. The purpose of this study was to design a novel analysis of asymmetry utilizing CBCT that could be used in a standard orthodontic diagnostic analysis. Methods: CBCT images of 35 patients from the UCSF Orthodontic Clinic were used for development of the analysis. A pilot study with 5 patients having marked asymmetries was traced at 3 different time points to aid in landmark verification and assess reliability. A series of landmarks sharing commonalities with those used in two-dimensional cephalometric analysis were applied. A Pearson Correlation Coefficient with Bonferonni correction as well as a Bland-Altman test for reproducibility was applied for the three timepoints on five different patients to test intraobserver reliability. 10 patients with a molar Class I malocclusion, 10 patients with CII malocclusions, and 10 with CIII malocclusions were used to create a sample of patients with the applied orientation method and asymmetry analysis. Results: Landmark identification was found to be reproducible with only a weak statistical difference in landmark identification. No statistically significant differences were found between any landmarks and their different timepoint selections, particularly those points essential to the establishment of the analysis axis (p<.05). The index provided a quantitative assessment in three planes for both numerical and visual evidence of asymmetry. Conclusions: The Ulrich Orthodontic Asymmetry analysis, combined with reliable and reproducible landmark selection, allows for successful quantitative assessment of asymmetry identification in both 2-dimensional and 3-dimensional visualizations and may provide a standard diagnostic tool to be used with patients seeking orthodontic treatment.

Subjects/Keywords: Dentistry; asymmetry; CBCT; cone-beam CT; craniofacial skeleton; three-dimensional analysis; three-dimensional imaging

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ulrich, B. (2012). A Novel Analysis of Skeletal Asymmetry Utilizing 3D CBCT Technology: The Ulrich Analysis. (Thesis). University of California – San Francisco. Retrieved from http://www.escholarship.org/uc/item/14q55139

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ulrich, Beau. “A Novel Analysis of Skeletal Asymmetry Utilizing 3D CBCT Technology: The Ulrich Analysis.” 2012. Thesis, University of California – San Francisco. Accessed January 15, 2021. http://www.escholarship.org/uc/item/14q55139.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ulrich, Beau. “A Novel Analysis of Skeletal Asymmetry Utilizing 3D CBCT Technology: The Ulrich Analysis.” 2012. Web. 15 Jan 2021.

Vancouver:

Ulrich B. A Novel Analysis of Skeletal Asymmetry Utilizing 3D CBCT Technology: The Ulrich Analysis. [Internet] [Thesis]. University of California – San Francisco; 2012. [cited 2021 Jan 15]. Available from: http://www.escholarship.org/uc/item/14q55139.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ulrich B. A Novel Analysis of Skeletal Asymmetry Utilizing 3D CBCT Technology: The Ulrich Analysis. [Thesis]. University of California – San Francisco; 2012. Available from: http://www.escholarship.org/uc/item/14q55139

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – San Francisco

28. Nguyen, Emerald. Three-dimensional comparison of asymmetry in different sagittal skeletal patterns using geometric morphometrics.

Degree: Oral and Craniofacial Sciences, 2014, University of California – San Francisco

URL: http://www.escholarship.org/uc/item/6jd2g0z2

► Objective: To compare the difference in type and quantity of asymmetry between Class I, Class II, and Class III sagittal skeletal patterns using geometric morphometrics.… (more)

▼ Objective: To compare the difference in type and quantity of asymmetry between Class I, Class II, and Class III sagittal skeletal patterns using geometric morphometrics. Methods: Surface models were constructed from pre-treatment three-dimensional CBCT scans of 144 patients (41 males, 103 females) randomly selected from the database at the University of California, San Francisco, Division of Orthodontics. There were a total of 62 skeletal Class I (0≤ANB≤4), 63 skeletal Class II (ANB>4), and 19 skeletal Class III (ANB<0) subjects. The surface models were constructed using Amira software (Mercury Computer Systems GmbH, Berlin, Germany)) for optimal viewing of various structures, including the maxilla, zygomatic arches, condyles, and mandibular body. Landmark placement (n=183) was completed using Landmark software (Institute for Data Analysis and Visualization (IDAV), UCDavis). Landmarks were identified for each individual and after Procrustes superimposition of the raw coordinates and deviations from bilateral symmetry were analyzed by Principal Components Analysis (PCA). Results: Permutation tests of the Procrustes distance showed that there was a statistically significant difference between Class I and Class III groups and between the Class II and Class III groups, but no difference between Class I and Class II groups. Principal component 1 (PC1) was significant for anterior mandibular deviations to the left with compensation of the remaining craniofacial structures. The average PC1 score for the Class III group was significantly different than that of the Class I and Class II groups. Hartigan's dip test showed that asymmetries within Class III population may have a bimodal distribution with a predilection for left side deviations. Conclusions: Asymmetries are more likely seen in skeletal Class III patients than in Class I and Class II patients. This asymmetry tends to be localized in the anterior mandible and is more often deviated to the left than right side.

Subjects/Keywords: Dentistry; asymmetry; cone-beam CT; craniofacial skeleton; geometric morphometric; three-dimensional imaging

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APA (6^th Edition):

Nguyen, E. (2014). Three-dimensional comparison of asymmetry in different sagittal skeletal patterns using geometric morphometrics. (Thesis). University of California – San Francisco. Retrieved from http://www.escholarship.org/uc/item/6jd2g0z2

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nguyen, Emerald. “Three-dimensional comparison of asymmetry in different sagittal skeletal patterns using geometric morphometrics.” 2014. Thesis, University of California – San Francisco. Accessed January 15, 2021. http://www.escholarship.org/uc/item/6jd2g0z2.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nguyen, Emerald. “Three-dimensional comparison of asymmetry in different sagittal skeletal patterns using geometric morphometrics.” 2014. Web. 15 Jan 2021.

Vancouver:

Nguyen E. Three-dimensional comparison of asymmetry in different sagittal skeletal patterns using geometric morphometrics. [Internet] [Thesis]. University of California – San Francisco; 2014. [cited 2021 Jan 15]. Available from: http://www.escholarship.org/uc/item/6jd2g0z2.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nguyen E. Three-dimensional comparison of asymmetry in different sagittal skeletal patterns using geometric morphometrics. [Thesis]. University of California – San Francisco; 2014. Available from: http://www.escholarship.org/uc/item/6jd2g0z2

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

29. Wadeson, Nicola Lisa. Modelling and correction of scatter in a switched source multi-ring detector X-ray CT machine.

Degree: PhD, 2011, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-correction-of-scatter-in-a-switched-source-multiring-detector-xray-ct-machine(a6700209-0eef-47d8-9ff0-1fa5e7bb67c5).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632151

► The RTT80 cone beam x-ray computed tomography system, developed by Rapiscan Systems Ltd, uses switched x-ray sources and fixed offset detector rings to remove the… (more)

Subjects/Keywords: 519.2; X-ray cone beam CT; RTT; Monte Carlo; Geant4; Scatter correction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wadeson, N. L. (2011). Modelling and correction of scatter in a switched source multi-ring detector X-ray CT machine. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-correction-of-scatter-in-a-switched-source-multiring-detector-xray-ct-machine(a6700209-0eef-47d8-9ff0-1fa5e7bb67c5).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632151

Chicago Manual of Style (16^th Edition):

Wadeson, Nicola Lisa. “Modelling and correction of scatter in a switched source multi-ring detector X-ray CT machine.” 2011. Doctoral Dissertation, University of Manchester. Accessed January 15, 2021. https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-correction-of-scatter-in-a-switched-source-multiring-detector-xray-ct-machine(a6700209-0eef-47d8-9ff0-1fa5e7bb67c5).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632151.

MLA Handbook (7^th Edition):

Wadeson, Nicola Lisa. “Modelling and correction of scatter in a switched source multi-ring detector X-ray CT machine.” 2011. Web. 15 Jan 2021.

Vancouver:

Wadeson NL. Modelling and correction of scatter in a switched source multi-ring detector X-ray CT machine. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Jan 15]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-correction-of-scatter-in-a-switched-source-multiring-detector-xray-ct-machine(a6700209-0eef-47d8-9ff0-1fa5e7bb67c5).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632151.

Council of Science Editors:

Wadeson NL. Modelling and correction of scatter in a switched source multi-ring detector X-ray CT machine. [Doctoral Dissertation]. University of Manchester; 2011. Available from: https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-correction-of-scatter-in-a-switched-source-multiring-detector-xray-ct-machine(a6700209-0eef-47d8-9ff0-1fa5e7bb67c5).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632151

Duke University

30. Giles, William. Cross-Scatter in Dual-Cone X-ray Imaging: Magnitude, Avoidance, Correction, and Artifact Reduction .

Degree: 2012, Duke University

URL: http://hdl.handle.net/10161/5794

► Onboard cone beam computed tomography (CBCT) has become a widespread means of three-dimensional target localization for radiation therapy; however, it is susceptible to metal… (more)

▼ Onboard cone beam computed tomography (CBCT) has become a widespread means of three-dimensional target localization for radiation therapy; however, it is susceptible to metal artifacts and beam-hardening artifacts that can hinder visualization of low contrast anatomy. Dual-CBCT provides easy access to techniques that may reduces such artifacts. Additionally, dual-CBCT can decrease imaging time and provide simultaneous orthogonal projections which may also be useful for fast target localization. However, dual-CBCT will suffer from large increases in scattered radiation due to the addition of the second source. An experimental bench top dual CBCT system was constructed so that each imaging chain in the dual CBCT system mimics the geometry of gantry-mounted CBCT systems commonly used in the radiation therapy room. The two systems share a common axis of rotation and are mounted orthogonally. Custom control software was developed to ensure reproducible exposure and rotation timings. This software allows the implementation of the acquisition sequences required for the cross scatter avoidance and correction strategies studied. Utilizing the experimental dual CBCT system cross scatter was characterized from 70-145 kVp in projections and reconstructed images using this system and three cylindrical phantoms (15cm, 20cm, and 30cm) with a common Catphan core. A novel strategy for avoiding cross-scatter in dual-CBCT was developed that utilized interleaved data acquisition on each imaging chain. Contrast and contrast-to-noise-ratio were measured in reconstructions to evaluate the effectiveness of this strategy to avoid the effects of cross scatter. A novel correction strategy for cross scatter was developed wherein the cross scatter was regularly sampled during the course of data acquisition and these samples were used as the basis for low- and high- frequency corrections for the cross-scatter in projections. The cross scatter sampling interval was determined for an anthropomorphic phantom at three different sites relevant to radiation therapy by estimating the angular Nyquist frequency. The low frequency portion of the cross scatter distribution is interpolated between samples to provide an estimate of the cross scatter distribution at every projection angle and was then subtracted from the projections. The high-frequency portion of the correction was applied after the low-frequency correction was applied. The novel high-frequency correction utilizes the fact that a direct estimate of the high-frequency components was obtained in the cross scatter samples. The high-frequency components of the measured cross scatter were subtracted from the projections in the Fourier domain, a process referred to as spectral subtraction. Each projection is corrected using the cross scatter sample taken at the closest projection angle. In order to apply this correction in the Fourier domain the high-frequency component of the cross scatter must be approximately stationary. To improve the stationarity of the… Advisors/Committee Members: Yin, Fang-Fang (advisor), Bowsher, James (advisor).

Subjects/Keywords: Medical imaging and radiology; cone-beam ct; crescent artifact; cross scatter; scatter

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Giles, W. (2012). Cross-Scatter in Dual-Cone X-ray Imaging: Magnitude, Avoidance, Correction, and Artifact Reduction . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/5794

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Giles, William. “Cross-Scatter in Dual-Cone X-ray Imaging: Magnitude, Avoidance, Correction, and Artifact Reduction .” 2012. Thesis, Duke University. Accessed January 15, 2021. http://hdl.handle.net/10161/5794.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Giles, William. “Cross-Scatter in Dual-Cone X-ray Imaging: Magnitude, Avoidance, Correction, and Artifact Reduction .” 2012. Web. 15 Jan 2021.

Vancouver:

Giles W. Cross-Scatter in Dual-Cone X-ray Imaging: Magnitude, Avoidance, Correction, and Artifact Reduction . [Internet] [Thesis]. Duke University; 2012. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10161/5794.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Giles W. Cross-Scatter in Dual-Cone X-ray Imaging: Magnitude, Avoidance, Correction, and Artifact Reduction . [Thesis]. Duke University; 2012. Available from: http://hdl.handle.net/10161/5794

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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