subject:(correction procedure via reconstruction)

University of Kansas

1. Jia, Feilin. Towards industrial large eddy simulation using the FR/CPR method.

Degree: PhD, Aerospace Engineering, 2019, University of Kansas

► NASA’s 2030 CFD Vision calls for the development of accurate and efficient scale-resolving simulations for turbulent flow, such as large eddy simulation (LES) and direct… (more)

▼ NASA’s 2030 CFD Vision calls for the development of accurate and efficient scale-resolving simulations for turbulent flow, such as large eddy simulation (LES) and direct numerical simulation (DNS). This is primarily because the Reynolds-averaged Navier-Stokes (RANS) approach has failed to predict vortex-dominated flow involving large flow separations, e.g., flow through a jet engine or over aircraft near the edge of the flight envelope, i.e., during take-off and landing at high angles of attack. Although the DNS approach resolves all turbulence scales, it is too expensive in the foreseeable future for real world flow problems because of the disparate length and time scales in the flow. LES resolves the energetic large scales while modeling the smaller scales, so it provides a good compromise between accuracy and cost. As a result, LES is widely considered to be the method of choice for next generation CFD design tool. The major obstacle for LES is its considerable computational cost since unsteady 3D simulations need to be performed to obtain the mean flow quantities such as the drag and lift coefficients. In order to resolve the dominant scales in a turbulent flow, numerical methods used for LES should have low dissipation and dispersion errors. This means standard second order finite-volume methods are usually not accurate or efficient enough for LES applications. High-order methods (order of accuracy 2) have demonstrated their potential for LES and DNS in the past decade because of their low embedded numerical dissipation and dispersion errors. In the present study, we develop and demonstrate a recently developed high-order method, called flux reconstruction (FR) or correction procedure via reconstruction (CPR), for industrial LES. A major advantage of the FR/CPR method is its capability to handle unstructured mixed meshes, and its compactness and scalability, which is particularly desired on modern super-computers. We therefore address the following major pacing items in industrial LES in the present study: High-order methods Geometric flexibility Efficient time integration Efficient implementation on modern super computers Demonstration for real world applications Advisors/Committee Members: Taghavi, Ray (advisor), Wang, Z.J. (advisor), Taghavi, Ray (cmtemember), Wang, Z.J. (cmtemember), Farokhi, Saeed (cmtemember), Zheng, Zhongquan (cmtemember), Shontz, Suzanne M (cmtemember).

Subjects/Keywords: Aerospace engineering; computational fluid dynamics; correction procedure via reconstruction; flux reconstruction; high order method; implicit time scheme

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

APA (6^th Edition):

Jia, F. (2019). Towards industrial large eddy simulation using the FR/CPR method. (Doctoral Dissertation). University of Kansas. Retrieved from http://hdl.handle.net/1808/29660

Chicago Manual of Style (16^th Edition):

Jia, Feilin. “Towards industrial large eddy simulation using the FR/CPR method.” 2019. Doctoral Dissertation, University of Kansas. Accessed March 07, 2021. http://hdl.handle.net/1808/29660.

MLA Handbook (7^th Edition):

Jia, Feilin. “Towards industrial large eddy simulation using the FR/CPR method.” 2019. Web. 07 Mar 2021.

Vancouver:

Jia F. Towards industrial large eddy simulation using the FR/CPR method. [Internet] [Doctoral dissertation]. University of Kansas; 2019. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1808/29660.

Council of Science Editors:

Jia F. Towards industrial large eddy simulation using the FR/CPR method. [Doctoral Dissertation]. University of Kansas; 2019. Available from: http://hdl.handle.net/1808/29660

Université de Grenoble

2. Pasca, Vladimir. Développement d'architectures HW/SW tolérantes aux fautes et auto-calibrantes pour les technologies Intégrées 3D : Development of HW/SW Fault Tolerant and Self-Configuring Architectures for 3D Integrated Technologies.

Degree: Docteur es, Sciences et technologie industrielles, 2013, Université de Grenoble

URL: http://www.theses.fr/2013GRENT001

►

Malgré les avantages de l'intégration 3D, le test, le rendement et la fiabilité des Through-Silicon-Vias (TSVs) restent parmi les plus grands défis pour les systèmes… (more)

▼

Malgré les avantages de l'intégration 3D, le test, le rendement et la fiabilité des Through-Silicon-Vias (TSVs) restent parmi les plus grands défis pour les systèmes 3D à base de Réseaux-sur-Puce (Network-on-Chip - NoC). Dans cette thèse, une stratégie de test hors-ligne a été proposé pour les interconnections TSV des liens inter-die des NoCs 3D. Pour le TSV Interconnect Built-In Self-Test (TSV-IBIST) on propose une nouvelle stratégie pour générer des vecteurs de test qui permet la détection des fautes structuraux (open et short) et paramétriques (fautes de délaye). Des stratégies de correction des fautes transitoires et permanents sur les TSV sont aussi proposées aux plusieurs niveaux d'abstraction: data link et network. Au niveau data link, des techniques qui utilisent des codes de correction (ECC) et retransmission sont utilisées pour protégé les liens verticales. Des codes de correction sont aussi utilisés pour la protection au niveau network. Les défauts de fabrication ou vieillissement des TSVs sont réparé au niveau data link avec des stratégies à base de redondance et sérialisation. Dans le réseau, les liens inter-die défaillante ne sont pas utilisables et un algorithme de routage tolérant aux fautes est proposé. On peut implémenter des techniques de tolérance aux fautes sur plusieurs niveaux. Les résultats ont montré qu'une stratégie multi-level atteint des très hauts niveaux de fiabilité avec un cout plus bas. Malheureusement, il n'y as pas une solution unique et chaque stratégie a ses avantages et limitations. C'est très difficile d'évaluer tôt dans le design flow les couts et l'impact sur la performance. Donc, une méthodologie d'exploration de la résilience aux fautes est proposée pour les NoC 3D mesh.

3D technology promises energy-efficient heterogeneous integrated systems, which may open the way to thousands cores chips. Silicon dies containing processing elements are stacked and connected by vertical wires called Through-Silicon-Vias. In 3D chips, interconnecting an increasing number of processing elements requires a scalable high-performance interconnect solution: the 3D Network-on-Chip. Despite the advantages of 3D integration, testing, reliability and yield remain the major challenges for 3D NoC-based systems. In this thesis, the TSV interconnect test issue is addressed by an off-line Interconnect Built-In Self-Test (IBIST) strategy that detects both structural (i.e. opens, shorts) and parametric faults (i.e. delays and delay due to crosstalk). The IBIST circuitry implements a novel algorithm based on the aggressor-victim scenario and alleviates limitations of existing strategies. The proposed Kth-aggressor fault (KAF) model assumes that the aggressors of a victim TSV are neighboring wires within a distance given by the aggressor order K. Using this model, TSV interconnect tests of inter-die 3D NoC links may be performed for different aggressor order, reducing test times and circuitry complexity. In 3D NoCs, TSV permanent and transient faults can be mitigated at different abstraction levels. In…

Advisors/Committee Members: Anghel, Lorena (thesis director).

Subjects/Keywords: Intégration 3D; Thru-Silicon-Via; Détection / Correction des Fautes; Réseau sur Puce; Auto-calibration; 3D Integration; Thru-Silicon-Via; Fault Detection / Correction; Networks-on-Chip; Self-configuring / Self-healing

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

APA (6^th Edition):

Pasca, V. (2013). Développement d'architectures HW/SW tolérantes aux fautes et auto-calibrantes pour les technologies Intégrées 3D : Development of HW/SW Fault Tolerant and Self-Configuring Architectures for 3D Integrated Technologies. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2013GRENT001

Chicago Manual of Style (16^th Edition):

Pasca, Vladimir. “Développement d'architectures HW/SW tolérantes aux fautes et auto-calibrantes pour les technologies Intégrées 3D : Development of HW/SW Fault Tolerant and Self-Configuring Architectures for 3D Integrated Technologies.” 2013. Doctoral Dissertation, Université de Grenoble. Accessed March 07, 2021. http://www.theses.fr/2013GRENT001.

MLA Handbook (7^th Edition):

Pasca, Vladimir. “Développement d'architectures HW/SW tolérantes aux fautes et auto-calibrantes pour les technologies Intégrées 3D : Development of HW/SW Fault Tolerant and Self-Configuring Architectures for 3D Integrated Technologies.” 2013. Web. 07 Mar 2021.

Vancouver:

Pasca V. Développement d'architectures HW/SW tolérantes aux fautes et auto-calibrantes pour les technologies Intégrées 3D : Development of HW/SW Fault Tolerant and Self-Configuring Architectures for 3D Integrated Technologies. [Internet] [Doctoral dissertation]. Université de Grenoble; 2013. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2013GRENT001.

Council of Science Editors:

Pasca V. Développement d'architectures HW/SW tolérantes aux fautes et auto-calibrantes pour les technologies Intégrées 3D : Development of HW/SW Fault Tolerant and Self-Configuring Architectures for 3D Integrated Technologies. [Doctoral Dissertation]. Université de Grenoble; 2013. Available from: http://www.theses.fr/2013GRENT001

3. Chamouine, Saïd Omar. Nouvelle approche de la correction de l'atténuation mammaire en tomoscintigraphie de perfusion myocardique : New approch of breast attenuation correction in SPECT myocardial perfusion imaging.

Degree: Docteur es, Sciences de l'ingénieur, 2011, Université Paris-Est

URL: http://www.theses.fr/2011PEST1073

►

Nous proposons dans le cadre de cette thèse une nouvelle approche permettant de s'affranchir de l'atténuation mammaire en tomographie par émission monophotonique (TEMP) de perfusion… (more)

Subjects/Keywords: Reconstruction Tomographique; Temp; Correction de l\' atténuation; Perfusion Myocardique; Reconstruction itérative; Atténuation mammaire; Tomographic reconstruction; Spect; Attenuation correction; Myocadial perfusion imaging; Iterative reconstruction; Breast attenuation

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

APA (6^th Edition):

Chamouine, S. O. (2011). Nouvelle approche de la correction de l'atténuation mammaire en tomoscintigraphie de perfusion myocardique : New approch of breast attenuation correction in SPECT myocardial perfusion imaging. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2011PEST1073

Chicago Manual of Style (16^th Edition):

Chamouine, Saïd Omar. “Nouvelle approche de la correction de l'atténuation mammaire en tomoscintigraphie de perfusion myocardique : New approch of breast attenuation correction in SPECT myocardial perfusion imaging.” 2011. Doctoral Dissertation, Université Paris-Est. Accessed March 07, 2021. http://www.theses.fr/2011PEST1073.

MLA Handbook (7^th Edition):

Chamouine, Saïd Omar. “Nouvelle approche de la correction de l'atténuation mammaire en tomoscintigraphie de perfusion myocardique : New approch of breast attenuation correction in SPECT myocardial perfusion imaging.” 2011. Web. 07 Mar 2021.

Vancouver:

Chamouine SO. Nouvelle approche de la correction de l'atténuation mammaire en tomoscintigraphie de perfusion myocardique : New approch of breast attenuation correction in SPECT myocardial perfusion imaging. [Internet] [Doctoral dissertation]. Université Paris-Est; 2011. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2011PEST1073.

Council of Science Editors:

Chamouine SO. Nouvelle approche de la correction de l'atténuation mammaire en tomoscintigraphie de perfusion myocardique : New approch of breast attenuation correction in SPECT myocardial perfusion imaging. [Doctoral Dissertation]. Université Paris-Est; 2011. Available from: http://www.theses.fr/2011PEST1073

Harvard University

4. Haskell, Melissa West. Retrospective Motion Correction for Magnetic Resonance Imaging.

Degree: PhD, 2019, Harvard University

URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029528

►

Magnetic resonance imaging, or MRI, is an important tool for diagnosing disease and studying the human body. MRI provides exceptional soft tissues contrast compared to… (more)

▼

Magnetic resonance imaging, or MRI, is an important tool for diagnosing disease and studying the human body. MRI provides exceptional soft tissues contrast compared to other medical imaging methods, and is essential for the diagnosis and treatment of many diseases. However, since its inception MRI has suffered from artifacts due to patient motion. Patient motion during MRI scans causes image artifacts that degrade diagnostic utility, often requiring repeated scans, patient callbacks, or lost diagnostic potential. Due to the prevalence and impact of motion in MRI, many techniques have been developed to detect and correct for patient motion, such as external tracking, MR motion tracking navigators, image entropy minimizations, and alternating optimizations. While all successful on some level, previous methods have sufficient weaknesses or side-effects to preclude their widespread clinical use. The goal of this work is to create a data consistency based retrospective motion correction method that can be translated to clinical use. Here we present two complementary methods for retrospective motion correction of brain MRI images: TArgeted Motion Estimation and Reduction (TAMER) and Network Accelerated Motion Estimation and Reduction (NAMER). TAMER solves for an uncorrupted MR image by jointly optimizing for the image and the unknown rigid-body motion of a subject’s head during the scan. We minimize the data consistency error of a SENSE+motion forward model, and use reduced modelling to make the optimization computationally feasible. NAMER builds on the TAMER method by incorporating a convolutional neural network (CNN) into the image reconstruction to accelerate algorithm convergence. TAMER simulation results show the improved optimization search direction accuracy using a reduced model and the potential for computational speedup. NAMER simulation results show how the inclusion of the CNN in the optimization allows for a truly parallel motion optimization to be constructed, which improves algorithm convergence and accuracy. TAMER phantom imaging results show the improvement in image quality over standard reconstructions when compared to a ground truth image. In vivo imaging experiments of healthy adult subjects and a neonatal subject show the potential of using TAMER and NAMER for motion mitigation in a clinical setting.

Biophysics

Advisors/Committee Members: Adalsteinsson, Elfar (committee member), Huang, Susie Y. (committee member), Rosen, Bruce R. (committee member), Hogle, James M. (committee member).

Subjects/Keywords: magnetic resonance imaging; motion correction; image reconstruction; optimization; model-based reconstruction; deep learning; machine learning

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

APA (6^th Edition):

Haskell, M. W. (2019). Retrospective Motion Correction for Magnetic Resonance Imaging. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029528

Chicago Manual of Style (16^th Edition):

Haskell, Melissa West. “Retrospective Motion Correction for Magnetic Resonance Imaging.” 2019. Doctoral Dissertation, Harvard University. Accessed March 07, 2021. http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029528.

MLA Handbook (7^th Edition):

Haskell, Melissa West. “Retrospective Motion Correction for Magnetic Resonance Imaging.” 2019. Web. 07 Mar 2021.

Vancouver:

Haskell MW. Retrospective Motion Correction for Magnetic Resonance Imaging. [Internet] [Doctoral dissertation]. Harvard University; 2019. [cited 2021 Mar 07]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029528.

Council of Science Editors:

Haskell MW. Retrospective Motion Correction for Magnetic Resonance Imaging. [Doctoral Dissertation]. Harvard University; 2019. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029528

University of Manitoba

5. Zhang, Geng. An algorithm for the simultaneous reconstruction of the radionuclide activity distribution and attenuation map based on PET scatter data.

Degree: Physics and Astronomy, 2015, University of Manitoba

URL: http://hdl.handle.net/1993/30803

► Attenuation correction is required for both qualitative and quantitative analysis of positron emission tomography (PET) imaging. Traditional attenuation correction methods use a transmission scan, such… (more)

Subjects/Keywords: PET; Scatter; Attenuation correction; Electron density; Simultaneous Reconstruction.

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

APA (6^th Edition):

Zhang, G. (2015). An algorithm for the simultaneous reconstruction of the radionuclide activity distribution and attenuation map based on PET scatter data. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/30803

Chicago Manual of Style (16^th Edition):

Zhang, Geng. “An algorithm for the simultaneous reconstruction of the radionuclide activity distribution and attenuation map based on PET scatter data.” 2015. Masters Thesis, University of Manitoba. Accessed March 07, 2021. http://hdl.handle.net/1993/30803.

MLA Handbook (7^th Edition):

Zhang, Geng. “An algorithm for the simultaneous reconstruction of the radionuclide activity distribution and attenuation map based on PET scatter data.” 2015. Web. 07 Mar 2021.

Vancouver:

Zhang G. An algorithm for the simultaneous reconstruction of the radionuclide activity distribution and attenuation map based on PET scatter data. [Internet] [Masters thesis]. University of Manitoba; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1993/30803.

Council of Science Editors:

Zhang G. An algorithm for the simultaneous reconstruction of the radionuclide activity distribution and attenuation map based on PET scatter data. [Masters Thesis]. University of Manitoba; 2015. Available from: http://hdl.handle.net/1993/30803

6. Grandell, Oscar. An iterative reconstruction algorithm for quantitative tissue decomposition using DECT.

Degree: The Institute of Technology, 2012, Linköping UniversityLinköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80964

► The introduction of dual energy CT, DECT, in the field of medical healthcare has made it possible to extract more information of the scanned… (more)

Subjects/Keywords: DECT; Iterative reconstruction; Tissue decomposition; Beam hardening correction

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APA (6^th Edition):

Grandell, O. (2012). An iterative reconstruction algorithm for quantitative tissue decomposition using DECT. (Thesis). Linköping UniversityLinköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80964

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):

Grandell, Oscar. “An iterative reconstruction algorithm for quantitative tissue decomposition using DECT.” 2012. Thesis, Linköping UniversityLinköping University. Accessed March 07, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80964.

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

MLA Handbook (7^th Edition):

Grandell, Oscar. “An iterative reconstruction algorithm for quantitative tissue decomposition using DECT.” 2012. Web. 07 Mar 2021.

Vancouver:

Grandell O. An iterative reconstruction algorithm for quantitative tissue decomposition using DECT. [Internet] [Thesis]. Linköping UniversityLinköping University; 2012. [cited 2021 Mar 07]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80964.

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

Council of Science Editors:

Grandell O. An iterative reconstruction algorithm for quantitative tissue decomposition using DECT. [Thesis]. Linköping UniversityLinköping University; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80964

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

University of California – Berkeley

7. Sanches, Fabio. Locality in Gravity.

Degree: Physics, 2018, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/52s6c1m2

► The research presented in this dissertation is primarily focused around the study of locality in quantum gravity. The emergence of locality is intimately tied to… (more)

Subjects/Keywords: Theoretical physics; Physics; AdS/CFT; Black holes; bulk reconstruction; entanglement entropy; holography; quantum error correction

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

APA (6^th Edition):

Sanches, F. (2018). Locality in Gravity. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/52s6c1m2

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):

Sanches, Fabio. “Locality in Gravity.” 2018. Thesis, University of California – Berkeley. Accessed March 07, 2021. http://www.escholarship.org/uc/item/52s6c1m2.

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

MLA Handbook (7^th Edition):

Sanches, Fabio. “Locality in Gravity.” 2018. Web. 07 Mar 2021.

Vancouver:

Sanches F. Locality in Gravity. [Internet] [Thesis]. University of California – Berkeley; 2018. [cited 2021 Mar 07]. Available from: http://www.escholarship.org/uc/item/52s6c1m2.

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

Council of Science Editors:

Sanches F. Locality in Gravity. [Thesis]. University of California – Berkeley; 2018. Available from: http://www.escholarship.org/uc/item/52s6c1m2

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

8. Karlsson, Anette. In-Plane Motion Correction in Reconstruction of non-Cartesian 3D-functional MRI.

Degree: The Institute of Technology, 2011, Linköping UniversityLinköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72056

►

When patients move during an MRI examination, severe artifacts arise in the reconstructed image and motion correction is therefore often desired. An in-plane motion… (more)

Subjects/Keywords: MRI; fMRI; PRESTO-CAN; Motion Correction; Radial Sampling Pattern; Fourier domain; Circular Correlation; Gridding Reconstruction

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

APA (6^th Edition):

Karlsson, A. (2011). In-Plane Motion Correction in Reconstruction of non-Cartesian 3D-functional MRI. (Thesis). Linköping UniversityLinköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72056

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):

Karlsson, Anette. “In-Plane Motion Correction in Reconstruction of non-Cartesian 3D-functional MRI.” 2011. Thesis, Linköping UniversityLinköping University. Accessed March 07, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72056.

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

MLA Handbook (7^th Edition):

Karlsson, Anette. “In-Plane Motion Correction in Reconstruction of non-Cartesian 3D-functional MRI.” 2011. Web. 07 Mar 2021.

Vancouver:

Karlsson A. In-Plane Motion Correction in Reconstruction of non-Cartesian 3D-functional MRI. [Internet] [Thesis]. Linköping UniversityLinköping University; 2011. [cited 2021 Mar 07]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72056.

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

Council of Science Editors:

Karlsson A. In-Plane Motion Correction in Reconstruction of non-Cartesian 3D-functional MRI. [Thesis]. Linköping UniversityLinköping University; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72056

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

Delft University of Technology

9. Minonzio, Claudio (author). A step towards aberration corrections for transcranial ultrasound: Estimation of skull thickness and speed of sound.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:0ed1c8ad-a7a2-4e60-8146-82ddda9ed0e0

► Ultrasound is a fast, harmless, cheap and portable imaging modality. In transcranial sonography (TCS) the applications include diagnosis of brain related diseases or tracking of… (more)

▼ Ultrasound is a fast, harmless, cheap and portable imaging modality. In transcranial sonography (TCS) the applications include diagnosis of brain related diseases or tracking of electrodes in deep brain stimulation (DBS) procedures. However, the skull has strong aberration effects on ultrasound and sets limits to the technology. The speed of sound in the skull is much higher than in the brain tissue. The commonly used ultrasound beamforming techniques usually do not account for the variation in speed of sound in the medium. Thus, the resulted images of the brain with such beamformers are strongly distorted. Such distortions in the image can for example cause false detection of the DBS electrode’s position in the brain. A practical solution to such a problem is an adaptive beamforming algorithmwhich considers the variation of speed of sound in the skull and brain tissue. The prerequisite for this algorithm to work is amap of speed of sound. That means the mapmust contain information about the thickness of the skull and its speed of sound. Since both parameters can vary considerably within the patient group, they have to be measured for every patient individually. The goal of this thesis is to investigate techniques which allow the measurement of the thickness and the speed of sound in the skull non-invasively using a commercially available ultrasound system. To do so, a dual transducer setup with the Verasonics system was developed. It allows to investigate quasi-tomographic techniques and also superimposition of the reconstructed images. In this report, three methods are investigated: a technique based on pulse echo signals; a technique which exploits the dispersion behaviour of Lamb waves; and the algebraic reconstruction technique (ART). Measurements on plastic slabs mimicking the human skull are conducted for all three methods. The ART performed poor because of missing angular information. The pulse echo method performed well formeasuring the speed of sound only when the thickness is provided. A novel approach based on the dispersion curves of Lamb waves to measure the speed of sound showed good results for plastic slabs. The numerical results are in good accordance with the measurements. However, the technique needs to be improved further to be applied on more complex targets such as human skull bone. Based on the results and considering the setup it is recommended to pursue the method which utilizes pulse-echo data. By adjusting the experimental setup the novel approach based on the dispersion curves of Lamb waves could also very likely be successful under clinical conditions. In conclusion, the developed techniques are capable ofmeasuring the thickness and the speed of sound of plates. Utilizing these data in an adaptive beamformer, the aberration effect of the plastic plates is successfully corrected in the reconstructed image. Although a simplified model was assumed, the promising results are a step towards aberration corrections for transcranial ultrasound in humans. Advisors/Committee Members: Hemm, Simone (mentor), Daeichin, Verya (mentor), Delft University of Technology (degree granting institution), Fachhochschule Nordwestschweiz School of Life Sciences (degree granting institution).

Subjects/Keywords: Transcranial ultrasound; Aberration correction; Deep brain stimulation; Ultrasound; adaptive beamforming; Lamb waves; Algebraic reconstruction Technique

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

APA (6^th Edition):

Minonzio, C. (. (2019). A step towards aberration corrections for transcranial ultrasound: Estimation of skull thickness and speed of sound. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0ed1c8ad-a7a2-4e60-8146-82ddda9ed0e0

Chicago Manual of Style (16^th Edition):

Minonzio, Claudio (author). “A step towards aberration corrections for transcranial ultrasound: Estimation of skull thickness and speed of sound.” 2019. Masters Thesis, Delft University of Technology. Accessed March 07, 2021. http://resolver.tudelft.nl/uuid:0ed1c8ad-a7a2-4e60-8146-82ddda9ed0e0.

MLA Handbook (7^th Edition):

Minonzio, Claudio (author). “A step towards aberration corrections for transcranial ultrasound: Estimation of skull thickness and speed of sound.” 2019. Web. 07 Mar 2021.

Vancouver:

Minonzio C(. A step towards aberration corrections for transcranial ultrasound: Estimation of skull thickness and speed of sound. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 07]. Available from: http://resolver.tudelft.nl/uuid:0ed1c8ad-a7a2-4e60-8146-82ddda9ed0e0.

Council of Science Editors:

Minonzio C(. A step towards aberration corrections for transcranial ultrasound: Estimation of skull thickness and speed of sound. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:0ed1c8ad-a7a2-4e60-8146-82ddda9ed0e0

Brno University of Technology

10. Janoušková, Zuzana. Bronx - změna adresy (přestavba káznice): Bronx - address substitution (reconstruction house of correction).

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/8029

► Bronx - address substitution (reconstruction house of correction) The graduation thesis deals with an architectural study of a new utilization of the top security prison… (more)

Subjects/Keywords: Bronx - změna adresy (přestavba káznice); Bronx - address substitution (reconstruction house of correction)

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APA (6^th Edition):

Janoušková, Z. (2019). Bronx - změna adresy (přestavba káznice): Bronx - address substitution (reconstruction house of correction). (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/8029

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):

Janoušková, Zuzana. “Bronx - změna adresy (přestavba káznice): Bronx - address substitution (reconstruction house of correction).” 2019. Thesis, Brno University of Technology. Accessed March 07, 2021. http://hdl.handle.net/11012/8029.

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

MLA Handbook (7^th Edition):

Janoušková, Zuzana. “Bronx - změna adresy (přestavba káznice): Bronx - address substitution (reconstruction house of correction).” 2019. Web. 07 Mar 2021.

Vancouver:

Janoušková Z. Bronx - změna adresy (přestavba káznice): Bronx - address substitution (reconstruction house of correction). [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11012/8029.

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

Council of Science Editors:

Janoušková Z. Bronx - změna adresy (přestavba káznice): Bronx - address substitution (reconstruction house of correction). [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/8029

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

Virginia Tech

11. Phillips, Tyrone. Residual-based Discretization Error Estimation for Computational Fluid Dynamics.

Degree: PhD, Aerospace Engineering, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/50647

► The largest and most difficult numerical approximation error to estimate is discretization error. Residual-based discretization error estimation methods are a category of error estimators that… (more)

▼ The largest and most difficult numerical approximation error to estimate is discretization error. Residual-based discretization error estimation methods are a category of error estimators that use an estimate of the source of discretization error and information about the specific application to estimate the discretization error using only one grid level. The higher-order terms are truncated from the discretized equations and are the local source of discretization error. The accuracy of the resulting discretization error estimate depends solely on the accuracy of the estimated truncation error. Residual-based methods require only one grid level compared to the more commonly used Richardson extrapolation which requires at least two. Reducing the required number of grid levels reduces computational expense and, since only one grid level is required, can be applied to unstructured grids where multiple quality grid levels are difficult to produce. The two residual-based discretization error estimators of interest are defect correction and error transport equations. The focus of this work is the development, improvement, and evaluation of various truncation error estimation methods considering the accuracy of the truncation error estimate and the resulting discretization error estimates. The minimum requirements for accurate truncation error estimation is specified along with proper treatment for several boundary conditions. The methods are evaluated using various Euler and Navier-Stokes applications. The discretization error estimates are compared to Richardson extrapolation. The most accurate truncation error estimation method was found to be the k-exact method where the fine grid with a correction factor was considerably reliable. The single grid methods including the k-exact require that the continuous operator be modified at the boundary to be consistent with the implemented boundary conditions. Defect correction showed to be more accurate for areas of larger discretization error; however, the cost was substantial (although cheaper than the primal problem) compared to the cost of solving the ETEs which was essential free due to the linearization. Both methods showed significantly more accurate estimates compared to Richardson extrapolation especially for smooth problems. Reduced accuracy was apparent with the presence of stronger shocks and some possible modifications to adapt to singularies are proposed for future work. Advisors/Committee Members: Roy, Christopher John (committeechair), Mason, William H. (committee member), Tafti, Danesh K. (committee member), Cliff, Eugene M. (committee member), Borggaard, Jeffrey T. (committee member).

Subjects/Keywords: CFD; solution reconstruction; discretization error; truncation error; defect correction; error transport equations

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APA (6^th Edition):

Phillips, T. (2014). Residual-based Discretization Error Estimation for Computational Fluid Dynamics. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/50647

Chicago Manual of Style (16^th Edition):

Phillips, Tyrone. “Residual-based Discretization Error Estimation for Computational Fluid Dynamics.” 2014. Doctoral Dissertation, Virginia Tech. Accessed March 07, 2021. http://hdl.handle.net/10919/50647.

MLA Handbook (7^th Edition):

Phillips, Tyrone. “Residual-based Discretization Error Estimation for Computational Fluid Dynamics.” 2014. Web. 07 Mar 2021.

Vancouver:

Phillips T. Residual-based Discretization Error Estimation for Computational Fluid Dynamics. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10919/50647.

Council of Science Editors:

Phillips T. Residual-based Discretization Error Estimation for Computational Fluid Dynamics. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/50647

Leiden University

12. Brunke, Luca. Uncertainty in archaeological 3D reconstructions: A case study of monument 434 at the Via Appia near Rome.

Degree: 2018, Leiden University

URL: http://hdl.handle.net/1887/59548

Subjects/Keywords: 3D; reconstruction; uncertainty; Via Appia; modeling; scientific transparency

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APA (6^th Edition):

Brunke, L. (2018). Uncertainty in archaeological 3D reconstructions: A case study of monument 434 at the Via Appia near Rome. (Masters Thesis). Leiden University. Retrieved from http://hdl.handle.net/1887/59548

Chicago Manual of Style (16^th Edition):

Brunke, Luca. “Uncertainty in archaeological 3D reconstructions: A case study of monument 434 at the Via Appia near Rome.” 2018. Masters Thesis, Leiden University. Accessed March 07, 2021. http://hdl.handle.net/1887/59548.

MLA Handbook (7^th Edition):

Brunke, Luca. “Uncertainty in archaeological 3D reconstructions: A case study of monument 434 at the Via Appia near Rome.” 2018. Web. 07 Mar 2021.

Vancouver:

Brunke L. Uncertainty in archaeological 3D reconstructions: A case study of monument 434 at the Via Appia near Rome. [Internet] [Masters thesis]. Leiden University; 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1887/59548.

Council of Science Editors:

Brunke L. Uncertainty in archaeological 3D reconstructions: A case study of monument 434 at the Via Appia near Rome. [Masters Thesis]. Leiden University; 2018. Available from: http://hdl.handle.net/1887/59548

North Carolina State University

13. Raghavachar, Kavitha. Performance Modeling using a Genetic Programming Based Model Error Correction Procedure.

Degree: MS, Civil Engineering, 2006, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/1157

► Application performance models provide insight to designers of high performance computing (HPC) systems on the role of subsystems such as the processor or the network… (more)

Subjects/Keywords: Performance modeling; Genetic programming; Error correction procedure

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APA (6^th Edition):

Raghavachar, K. (2006). Performance Modeling using a Genetic Programming Based Model Error Correction Procedure. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/1157

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):

Raghavachar, Kavitha. “Performance Modeling using a Genetic Programming Based Model Error Correction Procedure.” 2006. Thesis, North Carolina State University. Accessed March 07, 2021. http://www.lib.ncsu.edu/resolver/1840.16/1157.

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

MLA Handbook (7^th Edition):

Raghavachar, Kavitha. “Performance Modeling using a Genetic Programming Based Model Error Correction Procedure.” 2006. Web. 07 Mar 2021.

Vancouver:

Raghavachar K. Performance Modeling using a Genetic Programming Based Model Error Correction Procedure. [Internet] [Thesis]. North Carolina State University; 2006. [cited 2021 Mar 07]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/1157.

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

Council of Science Editors:

Raghavachar K. Performance Modeling using a Genetic Programming Based Model Error Correction Procedure. [Thesis]. North Carolina State University; 2006. Available from: http://www.lib.ncsu.edu/resolver/1840.16/1157

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

University of Kentucky

14. Landon, Jr., George V. Innovative Techniques for Digitizing and Restoring Deteriorated Historical Documents.

Degree: 2008, University of Kentucky

URL: https://uknowledge.uky.edu/gradschool_diss/599

► Recent large-scale document digitization initiatives have created new modes of access to modern library collections with the development of new hardware and software technologies. Most… (more)

▼ Recent large-scale document digitization initiatives have created new modes of access to modern library collections with the development of new hardware and software technologies. Most commonly, these digitization projects focus on accurately scanning bound texts, some reaching an efficiency of more than one million volumes per year. While vast digital collections are changing the way users access texts, current scanning paradigms can not handle many non-standard materials. Documentation forms such as manuscripts, scrolls, codices, deteriorated film, epigraphy, and rock art all hold a wealth of human knowledge in physical forms not accessible by standard book scanning technologies. This great omission motivates the development of new technology, presented by this thesis, that is not-only effective with deteriorated bound works, damaged manuscripts, and disintegrating photonegatives but also easily utilized by non-technical staff. First, a novel point light source calibration technique is presented that can be performed by library staff. Then, a photometric correction technique which uses known illumination and surface properties to remove shading distortions in deteriorated document images can be automatically applied. To complete the restoration process, a geometric correction is applied. Also unique to this work is the development of an image-based uncalibrated document scanner that utilizes the transmissivity of document substrates. This scanner extracts intrinsic document color information from one or both sides of a document. Simultaneously, the document shape is estimated to obtain distortion information. Lastly, this thesis provides a restoration framework for damaged photographic negatives that corrects photometric and geometric distortions. Current restoration techniques for the discussed form of negatives require physical manipulation to the photograph. The novel acquisition and restoration system presented here provides the first known solution to digitize and restore deteriorated photographic negatives without damaging the original negative in any way. This thesis work develops new methods of document scanning and restoration suitable for wide-scale deployment. By creating easy to access technologies, library staff can implement their own scanning initiatives and large-scale scanning projects can expand their current document-sets.

Subjects/Keywords: Document Digitization; Document Restoration; Translucent Shape Reconstruction; Photometric Correction; Geometric Correction

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APA (6^th Edition):

Landon, Jr., G. V. (2008). Innovative Techniques for Digitizing and Restoring Deteriorated Historical Documents. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/gradschool_diss/599

Chicago Manual of Style (16^th Edition):

Landon, Jr., George V. “Innovative Techniques for Digitizing and Restoring Deteriorated Historical Documents.” 2008. Doctoral Dissertation, University of Kentucky. Accessed March 07, 2021. https://uknowledge.uky.edu/gradschool_diss/599.

MLA Handbook (7^th Edition):

Landon, Jr., George V. “Innovative Techniques for Digitizing and Restoring Deteriorated Historical Documents.” 2008. Web. 07 Mar 2021.

Vancouver:

Landon, Jr. GV. Innovative Techniques for Digitizing and Restoring Deteriorated Historical Documents. [Internet] [Doctoral dissertation]. University of Kentucky; 2008. [cited 2021 Mar 07]. Available from: https://uknowledge.uky.edu/gradschool_diss/599.

Council of Science Editors:

Landon, Jr. GV. Innovative Techniques for Digitizing and Restoring Deteriorated Historical Documents. [Doctoral Dissertation]. University of Kentucky; 2008. Available from: https://uknowledge.uky.edu/gradschool_diss/599

Duke University

15. Guidon, Arnaud. High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity .

Degree: 2013, Duke University

URL: http://hdl.handle.net/10161/7126

► Diffusion tensor imaging (DTI) has emerged as a unique method to characterize brain tissue microstructure non-invasively. DTI typically provides the ability to study white… (more)

▼ Diffusion tensor imaging (DTI) has emerged as a unique method to characterize brain tissue microstructure non-invasively. DTI typically provides the ability to study white matter structure with a standard voxel resolution of 8μL over imaging field-of-views of the extent of the human brain. As such, it has long been recognized as a promising tool not only in clinical research for the diagnostic and monitoring of white matter diseases, but also for investigating the fundamental biological principles underlying the organization of long and short-range cortical networks. However, the complexity of brain structure within an MRI voxel makes it difficult to dissociate the tissue origins of the measured anisotropy. The tensor characterization is a composite result of proton pools in different tissue and cell structures with diverse diffusion properties. As such, partial volume effects introduce a strong bias which can lead to spurious measurements, especially in regions with a complex tissue structure such as interdigitating crossing fibers or in convoluted cortical folds near the grey/white matter interface. This dissertation focuses on the design and development of acquisition and image reconstruction strategies to improve the spatial resolution of diffusion imaging. After a brief review of the theory of diffusion MRI and of the basic principles of streamline tractography in the human brain, the main challenges to increasing the spatial resolution are discussed. A comprehensive characterization of artifacts due to motion and field inhomogeneities is provided and novel corrective methods are proposed to enable the acquisition of diffusion weighted data with 2D mulitslice imaging techniques with full brain coverage, increased SNR and high spatial resolutions of 1.25×1.25×1.25 mm³ within an acceptable scan time. The method is extended to a multishot k_{_z}-encoded 3D multislab spiral DTI and evaluated in normal human volunteers. To demonstrate the increased SNR and enhanced resolution capability of the proposed methods and more generally to assess the value of high-spatial resolution in diffusion imaging, a study of cortical depth-dependence of fractional anisotropy was performed at an unprecedented in-vivo inplane resolution of 0.390×0.390μm² and an investigation of the trade-offs between spatial resolution and cortical specificity was conducted within the connectome framework. Advisors/Committee Members: Song, Allen W (advisor).

Subjects/Keywords: Biomedical engineering; Medical imaging and radiology; connectivity; diffusion; high-resolution; image reconstruction; Magnetic Resonance Imaging; motion correction

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APA (6^th Edition):

Guidon, A. (2013). High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/7126

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):

Guidon, Arnaud. “High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity .” 2013. Thesis, Duke University. Accessed March 07, 2021. http://hdl.handle.net/10161/7126.

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

MLA Handbook (7^th Edition):

Guidon, Arnaud. “High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity .” 2013. Web. 07 Mar 2021.

Vancouver:

Guidon A. High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity . [Internet] [Thesis]. Duke University; 2013. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10161/7126.

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

Council of Science Editors:

Guidon A. High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity . [Thesis]. Duke University; 2013. Available from: http://hdl.handle.net/10161/7126

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

16. Lee, Sang Hyeb. Computational Framework for Small Animal SPECT Imaging: Simulation and Reconstruction.

Degree: 2015, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/3346

► Small animal Single Photon Emission Computed Tomography (SPECT) has been an invaluable asset in biomedical science since this non-invasive imaging technique allows the longitudinal studies… (more)

Subjects/Keywords: Medical Imaging; SPECT; Reconstruction; Simulation; Attenuation and Scatter Correction; Computer Engineering; Nuclear; Numerical Analysis and Scientific Computing

10 more images…

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APA (6^th Edition):

Lee, S. H. (2015). Computational Framework for Small Animal SPECT Imaging: Simulation and Reconstruction. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/3346

Chicago Manual of Style (16^th Edition):

Lee, Sang Hyeb. “Computational Framework for Small Animal SPECT Imaging: Simulation and Reconstruction.” 2015. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed March 07, 2021. https://trace.tennessee.edu/utk_graddiss/3346.

MLA Handbook (7^th Edition):

Lee, Sang Hyeb. “Computational Framework for Small Animal SPECT Imaging: Simulation and Reconstruction.” 2015. Web. 07 Mar 2021.

Vancouver:

Lee SH. Computational Framework for Small Animal SPECT Imaging: Simulation and Reconstruction. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2015. [cited 2021 Mar 07]. Available from: https://trace.tennessee.edu/utk_graddiss/3346.

Council of Science Editors:

Lee SH. Computational Framework for Small Animal SPECT Imaging: Simulation and Reconstruction. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2015. Available from: https://trace.tennessee.edu/utk_graddiss/3346

Northeastern University

17. Nasseri, Arash. Seismic response reconstruction and evaluation of nonlinear static analysis procedures using data from instrumented buildings.

Degree: PhD, Department of Civil and Environmental Engineering, 2010, Northeastern University

URL: http://hdl.handle.net/2047/d20000807

► In Nonlinear Static Procedures (NSP) the maximum structural responses are predicted from the result of pushover analyses in which the structure reaches a "target displacement"… (more)

▼ In Nonlinear Static Procedures (NSP) the maximum structural responses are predicted from the result of pushover analyses in which the structure reaches a "target displacement" determined from the response of an" equivalent" SDOF system to the seismic loading, defined as an elastic spectrum. This study evaluates the predictive capability of NSP using seismic data recorded on instrumented buildings and examines the issue of seismic response reconstruction. In connection with the second item it is shown that commonly used interpolation schemes are tantamount to fitting the response into a basis whose span is dictated by the number and location of sensors. A scheme, designated as the Minimum Norm Response Corrector (MIRC), which estimates the response as that of a nominal model subjected to the seismic excitation plus a set of pseudo forces that enforce the measurements is presented. It is found that MIRC provides estimates of the response that are significantly more accurate than that from interpolation schemes, especially for shears and drifts.; The single and multi-mode NSPs are evaluated by contrasting the predictions with the "true" values inferred from the measurements using MIRC. It is shown that the single-mode procedures provide reasonably accurate estimates of all responses in the short building but poor prediction of responses when the contribution from higher modes is substantial, i.e., shears and drifts in the tall buildings. An energy consistent (EC) SDOF is developed and is shown to result in more accurate predictions of roof (target) displacement than those used in the typical NSP. Incorporation of the EC SDOF into single and multi-mode procedures is presented as an alternative NSP and is evaluated. It is shown that while multi-mode procedures significantly improve the predictions in the tall buildings, a single-mode procedure using the EC SDOF and two load patterns, namely, one from the maximum linear story shears and the other from the code loading, gives prediction that are on par with those from multi-mode procedures.

Subjects/Keywords: civil engineering; instrumented buildings; nonlinear static procedure; pushover analysis; response reconstruction; state estimation; Earthquake hazard analysis; Buildings - Earthquake effects; Structural Engineering

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APA (6^th Edition):

Nasseri, A. (2010). Seismic response reconstruction and evaluation of nonlinear static analysis procedures using data from instrumented buildings. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/d20000807

Chicago Manual of Style (16^th Edition):

Nasseri, Arash. “Seismic response reconstruction and evaluation of nonlinear static analysis procedures using data from instrumented buildings.” 2010. Doctoral Dissertation, Northeastern University. Accessed March 07, 2021. http://hdl.handle.net/2047/d20000807.

MLA Handbook (7^th Edition):

Nasseri, Arash. “Seismic response reconstruction and evaluation of nonlinear static analysis procedures using data from instrumented buildings.” 2010. Web. 07 Mar 2021.

Vancouver:

Nasseri A. Seismic response reconstruction and evaluation of nonlinear static analysis procedures using data from instrumented buildings. [Internet] [Doctoral dissertation]. Northeastern University; 2010. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/2047/d20000807.

Council of Science Editors:

Nasseri A. Seismic response reconstruction and evaluation of nonlinear static analysis procedures using data from instrumented buildings. [Doctoral Dissertation]. Northeastern University; 2010. Available from: http://hdl.handle.net/2047/d20000807

18. Merlin, Thibaut. Reconstruction 4D intégrant la modélisation pharmacocinétique du radiotraceur en imagerie fonctionnelle combinée TEP/TDM : 4D reconstruction including radiopharmaceutical modeling in PET/CT imaging.

Degree: Docteur es, Sciences, technologie, santé. Bioinformatique, 2013, Université de Bordeaux Segalen

URL: http://www.theses.fr/2013BOR22111

► L'imagerie TEP permet de mesurer et visualiser les changements de la distribution biologique des radiopharmaceutiques au sein des organes d'intérêt au court du temps. Ce… (more)

▼ L'imagerie TEP permet de mesurer et visualiser les changements de la distribution biologique des radiopharmaceutiques au sein des organes d'intérêt au court du temps. Ce suivi temporel offre des informations très utiles concernant les processus métaboliques et physiologiques sous-jacents, qui peuvent être extraites grâce à différentes techniques de modélisation cinétique. De plus, un autre avantage de la prise en compte de l'information temporelle dans les acquisitions TEP pour les examens en oncologie thoracique concerne le suivi des mouvements respiratoires. Ces acquisitions permettent de mettre en place des protocoles et des méthodologies visant à corriger leurs effets néfastes à la quantification, et les artefacts associés. L'objectif de ce projet est de développer une méthode de reconstruction permettant de combiner et mettre en oeuvre d'une part les corrections nécessaires à la quantification des données en TEP, et d'autre part la modélisation de la biodistribution du radiotraceur au cours du temps permettant d'obtenir des images paramétriques pour l'oncologie thoracique. Dans un premier temps, une méthodologie de correction des effets de volume partiel intégrant, dans le processus de reconstruction, une déconvolution de Lucy-Richardson associée à un débruitage dans le domaine des ondelettes, a été proposée. Une seconde étude a été consacrée au développement d'une méthodologie combinant une régularisation temporelle des données par l'intermédiaire d'un ensemble de fonctions de base temporelles, avec une méthode de correction des mouvements respiratoires basée sur un modèle élastique. Enfin, dans une troisième étape, le modèle cinétique de Patlak a été intégré dans un algorithme de reconstruction dynamique, et associé à la correction de mouvement afin de permettre la reconstruction directe d'images paramétriques de données thoraciques soumises au mouvement respiratoire. Les paramètres de transformation élastique pour la correction de mouvement ont été calculés à partir des images TEP d'intervalles synchronisés par rapport à l'amplitude de la respiration du patient. Des simulations Monte-Carlo d'un fantôme 4D géométrique avec plusieurs niveaux de statistiques, et du fantôme anthropomorphique NCAT intégrant des courbes d'activités temporelles réalistes pour les différents tissus, ont été réalisées afin de comparer les performances de la méthode de reconstruction paramétrique développée dans ce travail avec une approche 3D standard d'analyse cinétique. L'algorithme proposé a ensuite été testé sur des données cliniques de patients présentant un cancer bronchique non à petites cellules. Enfin, après la validation indépendante de l'algorithme de correction des effets de volume partiel d'une part, et de la reconstruction 4D incorporant la régularisation temporelle d'autre part, sur données simulées et cliniques, ces deux méthodologies ont été associées afin d'optimiser l'estimation de la fonction d'entrée à partir d'une région sanguine des images reconstruites. Les résultats de ce travail démontrent que l'approche de… Advisors/Committee Members: Fernandez, Philippe (thesis director).

Subjects/Keywords: Imagerie médicale; Tomographie par émission de positons; TEP; Reconstruction d’images; Reconstruction dynamique; Modélisation cinétique; Imagerie quantitative; Correction des mouvements respiratoires; Régularisation temporelle; Effets de volume partiel; Medical imaging; Positron Emission Tomography; PET; Image reconstruction; Dynamic reconstruction; Kinetic modeling; Quantitative imaging; Respiratory motion correction; Temporal regularization; Partial volume effect

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APA (6^th Edition):

Merlin, T. (2013). Reconstruction 4D intégrant la modélisation pharmacocinétique du radiotraceur en imagerie fonctionnelle combinée TEP/TDM : 4D reconstruction including radiopharmaceutical modeling in PET/CT imaging. (Doctoral Dissertation). Université de Bordeaux Segalen. Retrieved from http://www.theses.fr/2013BOR22111

Chicago Manual of Style (16^th Edition):

Merlin, Thibaut. “Reconstruction 4D intégrant la modélisation pharmacocinétique du radiotraceur en imagerie fonctionnelle combinée TEP/TDM : 4D reconstruction including radiopharmaceutical modeling in PET/CT imaging.” 2013. Doctoral Dissertation, Université de Bordeaux Segalen. Accessed March 07, 2021. http://www.theses.fr/2013BOR22111.

MLA Handbook (7^th Edition):

Merlin, Thibaut. “Reconstruction 4D intégrant la modélisation pharmacocinétique du radiotraceur en imagerie fonctionnelle combinée TEP/TDM : 4D reconstruction including radiopharmaceutical modeling in PET/CT imaging.” 2013. Web. 07 Mar 2021.

Vancouver:

Merlin T. Reconstruction 4D intégrant la modélisation pharmacocinétique du radiotraceur en imagerie fonctionnelle combinée TEP/TDM : 4D reconstruction including radiopharmaceutical modeling in PET/CT imaging. [Internet] [Doctoral dissertation]. Université de Bordeaux Segalen; 2013. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2013BOR22111.

Council of Science Editors:

Merlin T. Reconstruction 4D intégrant la modélisation pharmacocinétique du radiotraceur en imagerie fonctionnelle combinée TEP/TDM : 4D reconstruction including radiopharmaceutical modeling in PET/CT imaging. [Doctoral Dissertation]. Université de Bordeaux Segalen; 2013. Available from: http://www.theses.fr/2013BOR22111

19. Auer, Benjamin. Modélisation et caractérisation d'un système TEMP à collimation sténopée dédié à l'imagerie du petit animal : Modeling and characterization of a SPECT system with pinhole collimation for the imaging of small animals.

Degree: Docteur es, Physique, 2017, Université de Strasbourg

URL: http://www.theses.fr/2017STRAE001

►

Le développement de plusieurs méthodes de reconstruction quantitatives dédiées à la Tomographie par Emission Mono Photonique du petit animal a été au cœur de cette… (more)

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Le développement de plusieurs méthodes de reconstruction quantitatives dédiées à la Tomographie par Emission Mono Photonique du petit animal a été au cœur de cette thèse. Dans cette optique, une modélisation rigoureuse par simulation Monte Carlo du processus d’acquisition du système disponible, a été mise en place et validée. La modélisation matricielle combinée à l’algorithme de reconstruction itératif OS-EM, a permis la caractérisation des performances du système. Les valeurs de sensibilité et de résolution spatiale tomographique sont respectivement de 0,027% au centre du champ de vue et de 0,87 mm. Les limitations majeures des méthodes Monte Carlo nous ont conduit à développer une génération matricielle efficace et simplifiée des effets physiques occurrents dans le sujet. Mon approche, basée sur une décomposition de la matrice système, associée à une base de données pré-calculées, a démontré un temps acceptable pour un suivi quotidien (1h), conduisant à une reconstruction d’images personnalisée. Les approximations inhérentes à l’approche mise en place ont un impact modéré sur les valeurs des coefficients de recouvrement, une correction d’environ 10% ayant été obtenue.

My thesis focuses on the development of several quantitative reconstruction methods dedicated to small animal Single Photon Emission Computed Tomography. The latter is based on modeling the acquisition process of a 4-heads pinhole SPECT system using Monte Carlo simulations.The system matrix approach, combined with the OS-EM iterative reconstruction algorithm, enabled to characterize the system performances and to compare it to the state of the art. Sensitivity of about 0,027% in the center of the field of view combined with a tomographic spatial resolution of 0,87 mm were obtained.The major drawbacks of Monte Carlo methods led us to develop an efficient and simplified modeling of the physical effects occurring in the subject. My approach based on a system matrix decomposition, associated to a scatter pre-calculated database method, demonstrated an acceptable time for a daily imaging subject follow-up (1h), leading to a personalized imaging approach. The inherent approximations of the scatter pre-calculated approach have a moderate impact on the recovery coefficients results, nevertheless a correction of about 10% was achieved.

Advisors/Committee Members: Brasse, David (thesis director).

Subjects/Keywords: Simulations Monte Carlo; Matrice système; Reconstruction itérative 3D quantitative; Tomographie par Emission MonoPhotonique (TEMP); Correction de l’atténuation et de la diffusion; Monte Carlo simulations; System Matrix; Quantitative Iterative 3D reconstruction; Single Photon Emission Computed Tomography (SPECT); Attenuation and Scattering correction; 539.7; 616.075

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

APA (6^th Edition):

Auer, B. (2017). Modélisation et caractérisation d'un système TEMP à collimation sténopée dédié à l'imagerie du petit animal : Modeling and characterization of a SPECT system with pinhole collimation for the imaging of small animals. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2017STRAE001

Chicago Manual of Style (16^th Edition):

Auer, Benjamin. “Modélisation et caractérisation d'un système TEMP à collimation sténopée dédié à l'imagerie du petit animal : Modeling and characterization of a SPECT system with pinhole collimation for the imaging of small animals.” 2017. Doctoral Dissertation, Université de Strasbourg. Accessed March 07, 2021. http://www.theses.fr/2017STRAE001.

MLA Handbook (7^th Edition):

Auer, Benjamin. “Modélisation et caractérisation d'un système TEMP à collimation sténopée dédié à l'imagerie du petit animal : Modeling and characterization of a SPECT system with pinhole collimation for the imaging of small animals.” 2017. Web. 07 Mar 2021.

Vancouver:

Auer B. Modélisation et caractérisation d'un système TEMP à collimation sténopée dédié à l'imagerie du petit animal : Modeling and characterization of a SPECT system with pinhole collimation for the imaging of small animals. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2017. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2017STRAE001.

Council of Science Editors:

Auer B. Modélisation et caractérisation d'un système TEMP à collimation sténopée dédié à l'imagerie du petit animal : Modeling and characterization of a SPECT system with pinhole collimation for the imaging of small animals. [Doctoral Dissertation]. Université de Strasbourg; 2017. Available from: http://www.theses.fr/2017STRAE001

Université de Lorraine

20. Menini, Anne. Mise en oeuvre d'un système de reconstruction adaptif pour l'IRM 3D des organes en mouvement : Implementation of an adaptive reconstruction system for 3D MRI of moving organs.

Degree: Docteur es, Automatique, Traitement du Signal et des Images, Génie Informatique, 2013, Université de Lorraine

URL: http://www.theses.fr/2013LORR0289

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L'Imagerie par Résonance Magnétique (IRM) présente deux caractéristiques principales. La première, sa capacité à manipuler le contraste, constitue son principal avantage par rapport aux autres… (more)

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L'Imagerie par Résonance Magnétique (IRM) présente deux caractéristiques principales. La première, sa capacité à manipuler le contraste, constitue son principal avantage par rapport aux autres modalités d'imagerie. Cela permet d'obtenir des informations complémentaires pour une meilleure détectabilité et une meilleure précision dans le diagnostic. Cela est particulièrement appréciable pour les pathologies du myocarde. La seconde caractéristique de l'IRM est également l'un de ces principaux inconvénients : le processus d'acquisition est relativement lent. De ce fait, les mouvements du patient constituent un obstacle important puisqu'ils perturbent ce processus d'acquisition, ce qui se traduit par des artéfacts dans l'image reconstruite. L'imagerie cardiaque et abdominale sont donc particulièrement sensibles à cette problématique du mouvement. L'objectif de cette thèse est donc de proposer une méthode de correction de mouvement intégrable dans un contexte multi-contraste. Nous avons étudié dans un premier temps la question de la correction de mouvement seule. Pour cela, nous nous sommes plus particulièrement intéressés à la méthode GRICS déjà développée au laboratoire IADI. Cette méthode permet la reconstruction conjointe d'une image sans artéfact et d'un modèle de mouvement non rigide permettant de corriger les déplacements qui surviennent pendant l'acquisition. Le premier apport majeur de cette thèse a consisté à améliorer la méthode GRICS, notamment pour l'adapter à l'imagerie volumique 3D. Il s'agit d'une nouvelle méthode de régularisation adaptative particulièrement adaptée au problème inverse posé dans GRICS. Le second apport majeur de cette thèse a consisté à gérer la correction de mouvement GRICS de manière conjointe sur des acquisitions présentant des contrastes différents. Il s'agit de concevoir l'examen IRM comme un tout et d'exploiter au mieux les informations partagées entre les différents contrastes. Toutes ces méthodes ont été appliquées et validées par des simulations, des tests sur fantôme, sur volontaires sains et sur des patients dans la cadre d'études cliniques. L'application cardiaque a été particulièrement visée. Les méthodes développées ont permis d'améliorer le processus d'acquisition et de reconstruction dans le contexte clinique réel

Magnetic Resonance Imaging (MRI) has two main features. The first one, its ability to manipulate contrast, is a major advantage compared to the other imaging modalities. It allows to access complementary information for a better detectability and a diagnostic more accurate. This is especially useful for myocardium pathologies. The second feature of MRI is also one of its main drawbacks: the acquisition process is slow. Therefore, patient motion is a significant obstacle because it disturbs the acquisition process, which leads to artifacts in the reconstructed image. Cardiac and thoracic imaging are particularly sensitive to this motion issue. The aim of this thesis is to develop a new motion correction method that can be integrated in a multi-contrast workflow.…

Advisors/Committee Members: Felblinger, Jacques (thesis director), Odille, Freddy (thesis director).

Subjects/Keywords: Imagerie par Résonance Magnétique; Reconstruction d'image; Problème inverse; Correction de mouvement; Déformation non-rigide; Multi-contraste; Imagerie cardiaque; Magnetic Resonance Imaging; Image reconstruction; Inverse problem; Motion correction; Non-rigid distortion; Multi-contrast; Cardiac imaging; 621.367; 616.075 48

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

APA (6^th Edition):

Menini, A. (2013). Mise en oeuvre d'un système de reconstruction adaptif pour l'IRM 3D des organes en mouvement : Implementation of an adaptive reconstruction system for 3D MRI of moving organs. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2013LORR0289

Chicago Manual of Style (16^th Edition):

Menini, Anne. “Mise en oeuvre d'un système de reconstruction adaptif pour l'IRM 3D des organes en mouvement : Implementation of an adaptive reconstruction system for 3D MRI of moving organs.” 2013. Doctoral Dissertation, Université de Lorraine. Accessed March 07, 2021. http://www.theses.fr/2013LORR0289.

MLA Handbook (7^th Edition):

Menini, Anne. “Mise en oeuvre d'un système de reconstruction adaptif pour l'IRM 3D des organes en mouvement : Implementation of an adaptive reconstruction system for 3D MRI of moving organs.” 2013. Web. 07 Mar 2021.

Vancouver:

Menini A. Mise en oeuvre d'un système de reconstruction adaptif pour l'IRM 3D des organes en mouvement : Implementation of an adaptive reconstruction system for 3D MRI of moving organs. [Internet] [Doctoral dissertation]. Université de Lorraine; 2013. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2013LORR0289.

Council of Science Editors:

Menini A. Mise en oeuvre d'un système de reconstruction adaptif pour l'IRM 3D des organes en mouvement : Implementation of an adaptive reconstruction system for 3D MRI of moving organs. [Doctoral Dissertation]. Université de Lorraine; 2013. Available from: http://www.theses.fr/2013LORR0289

21. Bhatia, Navnina. Scattering correction in cone beam tomography using continuously thickness-adapted kernels : Correction du diffusé en tomographie par une méthode de convolution par noyaux continus.

Degree: Docteur es, Traitement du signal et de l'image, 2016, Lyon

URL: http://www.theses.fr/2016LYSEI092

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La tomodensitométrie intégrant une source de rayons X à faisceau divergent et un détecteur grand champ est une technique bien connue dans le domaine de… (more)

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La tomodensitométrie intégrant une source de rayons X à faisceau divergent et un détecteur grand champ est une technique bien connue dans le domaine de la tomographie industrielle. La nature des matériaux et les épaisseurs traversées conduisent inévitablement à la génération de rayonnement diffusé. Ce dernier est généré par l’objet mais également par le détecteur. La présence de rayonnement parasite conduit à ne plus respecter l’hypothèse de la loi de Beer-Lambert. Par conséquent, on voit apparaitre sur les coupes tomographiques des artefacts de reconstruction comme des streaks, des effets ventouses ou des valeurs d’atténuation linéaire erronée. Par conséquence, on retrouve dans la littérature de nombreuses méthodes de correction du diffusé. Ce travail vise à mettre en point et tester une méthode originale de correction du diffusé. Le premier chapitre de cette étude, dresse un état de l’art de la plupart des méthodes de corrections existantes. Nous proposons, dans le deuxième chapitre, une évolution de la méthode de superposition des noyaux de convolution (Scatter Kernel Superposition). Notre méthode repose sur une description continue des noyaux en fonction de l’épaisseur traversée. Dans cette méthode, les noyaux de diffusion sont paramétrés analytiquement sur toute la plage d'épaisseur. Le procédé a été testé pour des objets à la fois mono-matériaux et poly-matériaux, ainsi que sur des données expérimentales et simulées. Nous montrons dans le troisième chapitre l’importance de la contribution du diffusé détecteur dans la qualité de l’image reconstruite. Mais également l’importance de décrire les noyaux de convolution à l'aide d'un modèle à quatre gaussienne. Les résultats obtenus à partir de données expérimentales prouvent que la correction du diffusé de l'objet seul ne suffit pas pour obtenir une image de reconstruite sans artefacts. Afin de disposer d’une meilleur modélisation du diffusé du détecteur, nous décrivons, dans le dernier chapitre, une méthode basée sur la combinaison de données expérimentales et simulées permettant d’améliorer l’estimation des noyaux de diffusé.

Advanced Cone Beam Computed Tomography (CBCT) typically uses a divergent conebeam source and a large area detector. As a result, there an inevitable increase in the size area of illumination causing an increase in the intensity of X-ray scatter signal, both from the object and the detector. This leads to the violation of prime assumption of reconstruction process which is based on straight line integrals path followed by the photons. Consequently scatter artifacts appear in the reconstruction images as steaks, cupping effect and thus produce wrong reconstruction values. Due to the severity of the reconstruction artifact caused by scatter, many scatter corrections methods have been adopted in literature. The first part of this study, reviews most of the existing scatter correction methods. The effect of scattering becomes more prominent and challenging in case of X-ray source of high energy which is used in industrial Non Destructive Testing…

Advisors/Committee Members: Létang, Jean-Michel (thesis director).

Subjects/Keywords: Imagerie rayon X; Imagerie industrielle; Reconstruction; Tomodensitométrie; Tomographie industrielle; Contrôle non-Desctructif; Rayonnement diffusé; Correction du signal; X-Ray Imaging; Image Reconstruction; Tomodensitometry; Non Destructive Characterisation; Cone Beam Tomography; Scatter correction; 616.075 707 2

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

APA (6^th Edition):

Bhatia, N. (2016). Scattering correction in cone beam tomography using continuously thickness-adapted kernels : Correction du diffusé en tomographie par une méthode de convolution par noyaux continus. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2016LYSEI092

Chicago Manual of Style (16^th Edition):

Bhatia, Navnina. “Scattering correction in cone beam tomography using continuously thickness-adapted kernels : Correction du diffusé en tomographie par une méthode de convolution par noyaux continus.” 2016. Doctoral Dissertation, Lyon. Accessed March 07, 2021. http://www.theses.fr/2016LYSEI092.

MLA Handbook (7^th Edition):

Bhatia, Navnina. “Scattering correction in cone beam tomography using continuously thickness-adapted kernels : Correction du diffusé en tomographie par une méthode de convolution par noyaux continus.” 2016. Web. 07 Mar 2021.

Vancouver:

Bhatia N. Scattering correction in cone beam tomography using continuously thickness-adapted kernels : Correction du diffusé en tomographie par une méthode de convolution par noyaux continus. [Internet] [Doctoral dissertation]. Lyon; 2016. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2016LYSEI092.

Council of Science Editors:

Bhatia N. Scattering correction in cone beam tomography using continuously thickness-adapted kernels : Correction du diffusé en tomographie par une méthode de convolution par noyaux continus. [Doctoral Dissertation]. Lyon; 2016. Available from: http://www.theses.fr/2016LYSEI092

22. Bihan-Poudec, Yann. IRM de diffusion cérébrale à haute résolution : développements des méthodes de reconstruction et de post-traitement : High-Resolution Diffusion MRI of the brain : developments in reconstruction and post-processing methods.

Degree: Docteur es, Imagerie médicale, 2019, Lyon

URL: http://www.theses.fr/2019LYSE1299

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L'imagerie de diffusion (IRMd) est une méthode unique permettant d'étudier la microstructure cérébrale et la connectivité du cerveau de manière non-invasive. Cependant, la faible résolution… (more)

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L'imagerie de diffusion (IRMd) est une méthode unique permettant d'étudier la microstructure cérébrale et la connectivité du cerveau de manière non-invasive. Cependant, la faible résolution et la qualité de cette imagerie restreint son utilisation dans certaines applications. L'objectif de cette thèse est de développer l'IRMd cérébrale à très haute résolution sur un modèle de macaque anesthésié au moyen d'une séquence d'imagerie 3D écho-planaire segmentée (3D-msEPI) à 3T. Après une étape de développement de la reconstruction et du post-traitement des données, nous avons réalisé des images de diffusion sur le cerveau de macaque à une résolution spatiale isotrope de 0.5mm. Cette résolution nous a permis de délimiter et caractériser les structures fines comme les sous-couches de l'hippocampe ou la matière blanche superficielle, qui sont indétectables avec des séquences classiques. Cependant, cette méthode se révèle vulnérable aux mouvements élastiques des tissus cérébraux induits par les pulsations cardio-vasculaires. Une stratégie de synchronisation de l'acquisition sur celle-ci nous a permis de caractériser leurs effets sur l'IRMd à très haute résolution chez le singe anesthésié. Ces effets se caractérisent par des artefacts de ghosting et des pertes de signal qui corrompent les images, le tenseur et la tractographie dans des zones spécifiques du cerveau. La synchronisation nous a ainsi permis de réaliser une imagerie de diffusion cérébrale de macaque à des résolutions spatiales et des pondérations en diffusion très élevées jamais atteintes auparavant. Ces résultats préliminaires démontrent le potentiel de notre méthode pour les applications neuroscientifiques et médicales chez l'homme

Diffusion imaging (dMRI) is a unique method for studying brain microstructure and brain connectivity in a non-invasive way. However, the low resolution and quality of this imaging restricts its use in some applications. The aim of this thesis is to develop very high resolution cerebral MRI on an anesthetized macaque model on a 3T scanner using a segmented 3D echo-planar 3D imaging sequence (3D-msEPI). After a stage of development of the reconstruction and post-processing of the data, we made diffusion images on the macaque brain at an isotropic spatial resolution of 0.5mm. This resolution allowed us to delineate and characterize fine structures such as hippocampal sublayers or superficial white matter, which are undetectable with classical sequences. However, this method is vulnerable to the elastic movements of the brain tissue induced by the cardiovascular pulsations. A strategy of synchronization of the acquisition on this one allowed us to characterize their effects on the very high resolution MRI in the anesthetized monkey. These effects are characterized by ghosting artifacts and signal losses that corrupt images, tensor, and tractography in specific areas of the brain. The synchronization allowed us to realize macaque brain diffusion imaging at spatial resolutions and very high diffusion weights never reached before. These…

Advisors/Committee Members: Hiba, Bassem (thesis director), Ben Hamed, Suliann (thesis director).

Subjects/Keywords: IRM de diffusion; Imagerie à Haute Résolution; Correction des Mouvements; Cerveau du Macaque; Imagerie du Cerveau; Reconstruction d'images; Méthodologie IRM; Microstructure; Diffusion MRI; High Resolution Imaging; Motion Correction; Macaque Brain; Brain Imaging; Image Reconstruction; MRI Methodology; Microstructure; 610

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

APA (6^th Edition):

Bihan-Poudec, Y. (2019). IRM de diffusion cérébrale à haute résolution : développements des méthodes de reconstruction et de post-traitement : High-Resolution Diffusion MRI of the brain : developments in reconstruction and post-processing methods. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2019LYSE1299

Chicago Manual of Style (16^th Edition):

Bihan-Poudec, Yann. “IRM de diffusion cérébrale à haute résolution : développements des méthodes de reconstruction et de post-traitement : High-Resolution Diffusion MRI of the brain : developments in reconstruction and post-processing methods.” 2019. Doctoral Dissertation, Lyon. Accessed March 07, 2021. http://www.theses.fr/2019LYSE1299.

MLA Handbook (7^th Edition):

Bihan-Poudec, Yann. “IRM de diffusion cérébrale à haute résolution : développements des méthodes de reconstruction et de post-traitement : High-Resolution Diffusion MRI of the brain : developments in reconstruction and post-processing methods.” 2019. Web. 07 Mar 2021.

Vancouver:

Bihan-Poudec Y. IRM de diffusion cérébrale à haute résolution : développements des méthodes de reconstruction et de post-traitement : High-Resolution Diffusion MRI of the brain : developments in reconstruction and post-processing methods. [Internet] [Doctoral dissertation]. Lyon; 2019. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2019LYSE1299.

Council of Science Editors:

Bihan-Poudec Y. IRM de diffusion cérébrale à haute résolution : développements des méthodes de reconstruction et de post-traitement : High-Resolution Diffusion MRI of the brain : developments in reconstruction and post-processing methods. [Doctoral Dissertation]. Lyon; 2019. Available from: http://www.theses.fr/2019LYSE1299

23. Rijal, Sanjeev 1979-. Complex Survey And Design Effect With Rao-Scott Correction And Log-Linear Analysis.

Degree: 2017, University of Saskatchewan

URL: http://hdl.handle.net/10388/7975

► Collection of data through sample surveys involves a wide range of techniques and procedures. Data is collected with the priority of maximum accuracy of information… (more)

Subjects/Keywords: Design Effect; Rao-Scott Correction; Simultaneous Test Procedure

…formulated the first and second order correction to the statistics of complex survey data to cope… …test procedure (STP). K.R. Gabriel has shown STP to test the homogeneity of the 2… …the entire population into different clusters or subgroups, cluster sampling procedure is… …proportion of sample units in category 𝑘 of domain U. The standard test procedure rejects 𝐻! when… …x28;Thomas and Rao 1988) One downside of Wald and Fay test procedure is that they…

8 more images…

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

APA (6^th Edition):

Rijal, S. 1. (2017). Complex Survey And Design Effect With Rao-Scott Correction And Log-Linear Analysis. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7975

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):

Rijal, Sanjeev 1979-. “Complex Survey And Design Effect With Rao-Scott Correction And Log-Linear Analysis.” 2017. Thesis, University of Saskatchewan. Accessed March 07, 2021. http://hdl.handle.net/10388/7975.

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

MLA Handbook (7^th Edition):

Rijal, Sanjeev 1979-. “Complex Survey And Design Effect With Rao-Scott Correction And Log-Linear Analysis.” 2017. Web. 07 Mar 2021.

Vancouver:

Rijal S1. Complex Survey And Design Effect With Rao-Scott Correction And Log-Linear Analysis. [Internet] [Thesis]. University of Saskatchewan; 2017. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10388/7975.

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

Council of Science Editors:

Rijal S1. Complex Survey And Design Effect With Rao-Scott Correction And Log-Linear Analysis. [Thesis]. University of Saskatchewan; 2017. Available from: http://hdl.handle.net/10388/7975

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

24. Farelo, Carla Maria Soares. Projecto de execução: traçado e materiais de via férrea: troço Miranda do Corvo/Serpins.

Degree: 2010, Repositório Científico do Instituto Politécnico de Lisboa

URL: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/407

► O presente Trabalho Final de Mestrado reporta-se ao desenvolvimento de um Projecto de Execução na especialidade de Via Férrea, no âmbito do SMM - Sistema… (more)

Subjects/Keywords: Via férrea; Traçado de via; Tipos de via; Materiais de via; Trabalhos de via

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

APA (6^th Edition):

Farelo, C. M. S. (2010). Projecto de execução: traçado e materiais de via férrea: troço Miranda do Corvo/Serpins. (Thesis). Repositório Científico do Instituto Politécnico de Lisboa. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/407

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):

Farelo, Carla Maria Soares. “Projecto de execução: traçado e materiais de via férrea: troço Miranda do Corvo/Serpins.” 2010. Thesis, Repositório Científico do Instituto Politécnico de Lisboa. Accessed March 07, 2021. http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/407.

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

MLA Handbook (7^th Edition):

Farelo, Carla Maria Soares. “Projecto de execução: traçado e materiais de via férrea: troço Miranda do Corvo/Serpins.” 2010. Web. 07 Mar 2021.

Vancouver:

Farelo CMS. Projecto de execução: traçado e materiais de via férrea: troço Miranda do Corvo/Serpins. [Internet] [Thesis]. Repositório Científico do Instituto Politécnico de Lisboa; 2010. [cited 2021 Mar 07]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/407.

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

Council of Science Editors:

Farelo CMS. Projecto de execução: traçado e materiais de via férrea: troço Miranda do Corvo/Serpins. [Thesis]. Repositório Científico do Instituto Politécnico de Lisboa; 2010. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/407

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

Université de Montréal

25. Bedwani, Stéphane. Étude des artefacts en tomodensitométrie par simulation Monte Carlo.

Degree: 2014, Université de Montréal

URL: http://hdl.handle.net/1866/10379

Subjects/Keywords: Programmation parallèle; Reconstruction d'image; Correction du rayonnement diffusé; Correction du durcissement de faisceau; Parallel programming; Image reconstruction; Scatter correction; Beam hardening correction; Physics - Radiation / Physique - Radiation (UMI : 0756)

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

APA (6^th Edition):

Bedwani, S. (2014). Étude des artefacts en tomodensitométrie par simulation Monte Carlo. (Thesis). Université de Montréal. Retrieved from http://hdl.handle.net/1866/10379

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):

Bedwani, Stéphane. “Étude des artefacts en tomodensitométrie par simulation Monte Carlo.” 2014. Thesis, Université de Montréal. Accessed March 07, 2021. http://hdl.handle.net/1866/10379.

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

MLA Handbook (7^th Edition):

Bedwani, Stéphane. “Étude des artefacts en tomodensitométrie par simulation Monte Carlo.” 2014. Web. 07 Mar 2021.

Vancouver:

Bedwani S. Étude des artefacts en tomodensitométrie par simulation Monte Carlo. [Internet] [Thesis]. Université de Montréal; 2014. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1866/10379.

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

Council of Science Editors:

Bedwani S. Étude des artefacts en tomodensitométrie par simulation Monte Carlo. [Thesis]. Université de Montréal; 2014. Available from: http://hdl.handle.net/1866/10379

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

University of Washington

26. Tang, Zheng. Robust Video Object Tracking via Camera Self-calibration.

Degree: PhD, 2019, University of Washington

URL: http://hdl.handle.net/1773/43951

► In this dissertation, a framework for 3D scene reconstruction based on robust video object tracking assisted by camera self-calibration is proposed, which includes several algorithmic… (more)

▼ In this dissertation, a framework for 3D scene reconstruction based on robust video object tracking assisted by camera self-calibration is proposed, which includes several algorithmic components. (1) An algorithm for joint camera self-calibration and automatic radial distortion correction based on tracking of walking persons is designed to convert multiple object tracking into 3D space. (2) An adaptive model that learns online a relatively long-term appearance change of each target is proposed for robust 3D tracking. (3) We also develop an iterative two-step evolutionary optimization scheme to estimate 3D pose of each human target, which can jointly compute the camera trajectory for a moving camera as well. (4) With 3D tracking results and human pose information from multiple views, we propose multi-view 3D scene reconstruction based on data association with visual and semantic attributes. Camera calibration and radial distortion correction are crucial prerequisites for 3D scene understanding. Many existing works rely on the Manhattan world assumption to estimate camera parameters automatically, however, they may perform poorly when lack of man-made structure in the scene. As walking humans are common objects in video analytics, they have also been used for camera calibration, but the main challenges include noise reduction for the estimation of vanishing points, the relaxation of assumptions on unknown camera parameters, and radial distortion correction. We propose a novel framework for camera self-calibration and automatic radial distortion correction. Our approach starts with a multi-kernel-based adaptive segmentation and tracking scheme that dynamically controls the decision thresholds of background subtraction and shadow removal around the adaptive kernel regions based on the preliminary tracking results. With the head/foot points collected from tracking and segmentation results, mean shift clustering and Laplace linear regression are introduced in the estimation of the vertical vanishing point and the horizon line, respectively. The estimation of distribution algorithm (EDA), an evolutionary optimization scheme, is then utilized to optimize the camera parameters and distortion coefficients, in which all the unknowns in camera projection can be fine-tuned simultaneously. Experiments on three public benchmarks and our own captured dataset demonstrate the robustness of the proposed method. The superiority of this algorithm is also verified by the capability of reliably converting 2D object tracking into 3D space. Multiple object tracking has been a challenging field, mainly due to noisy detection sets and identity switch caused by occlusion and similar appearance among nearby targets. Previous works rely on appearance models built on individual or several selected frames for the comparison of features, but they cannot encode long-term appearance change caused by pose, viewing angle and lighting condition. We propose an adaptive model that learns online a relatively long-term appearance change of each target. The… Advisors/Committee Members: Hwang, Jenq-Neng (advisor).

Subjects/Keywords: camera self-calibration; human pose estimation; multiple object tracking; multi-view object tracking; radial distortion correction; scene reconstruction; Artificial intelligence; Computer engineering; Electrical engineering; Electrical engineering

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

APA (6^th Edition):

Tang, Z. (2019). Robust Video Object Tracking via Camera Self-calibration. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/43951

Chicago Manual of Style (16^th Edition):

Tang, Zheng. “Robust Video Object Tracking via Camera Self-calibration.” 2019. Doctoral Dissertation, University of Washington. Accessed March 07, 2021. http://hdl.handle.net/1773/43951.

MLA Handbook (7^th Edition):

Tang, Zheng. “Robust Video Object Tracking via Camera Self-calibration.” 2019. Web. 07 Mar 2021.

Vancouver:

Tang Z. Robust Video Object Tracking via Camera Self-calibration. [Internet] [Doctoral dissertation]. University of Washington; 2019. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1773/43951.

Council of Science Editors:

Tang Z. Robust Video Object Tracking via Camera Self-calibration. [Doctoral Dissertation]. University of Washington; 2019. Available from: http://hdl.handle.net/1773/43951

Georgia State University

27. Gerasimov, Ekaterina. Analysis of NGS Data from Immune Response and Viral Samples.

Degree: PhD, Computer Science, 2017, Georgia State University

URL: https://scholarworks.gsu.edu/cs_diss/127

► This thesis is devoted to designing and applying advanced algorithmical and statistical tools for analysis of NGS data related to cancer and infection diseases.… (more)

Subjects/Keywords: Next generation sequencing; RNA virus; Viral population reconstruction; Error correction of NGS reads; Assembly of NGS reads; Random peptide phage display libraries; Breast cancer; Lyme disease; rubella; RNA-seq

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

APA (6^th Edition):

Gerasimov, E. (2017). Analysis of NGS Data from Immune Response and Viral Samples. (Doctoral Dissertation). Georgia State University. Retrieved from https://scholarworks.gsu.edu/cs_diss/127

Chicago Manual of Style (16^th Edition):

Gerasimov, Ekaterina. “Analysis of NGS Data from Immune Response and Viral Samples.” 2017. Doctoral Dissertation, Georgia State University. Accessed March 07, 2021. https://scholarworks.gsu.edu/cs_diss/127.

MLA Handbook (7^th Edition):

Gerasimov, Ekaterina. “Analysis of NGS Data from Immune Response and Viral Samples.” 2017. Web. 07 Mar 2021.

Vancouver:

Gerasimov E. Analysis of NGS Data from Immune Response and Viral Samples. [Internet] [Doctoral dissertation]. Georgia State University; 2017. [cited 2021 Mar 07]. Available from: https://scholarworks.gsu.edu/cs_diss/127.

Council of Science Editors:

Gerasimov E. Analysis of NGS Data from Immune Response and Viral Samples. [Doctoral Dissertation]. Georgia State University; 2017. Available from: https://scholarworks.gsu.edu/cs_diss/127

Brno University of Technology

28. Marek, Josef. Návrh rekonstrukce železniční tratě Chrudim - Borohrádek mezi km 35,0000 a 38,621 včetně technologie prací: Design Concept of Chrudim - Borohradek Railway Track Reconstruction (section between km 35.000 and km 38.621) with Technological Procedure of Works.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/190825

► The objective of this bachelor’s thesis was to design the optimization of the geometric parameters of railway track Chrudim – Borohrádek in km 35,000 –… (more)

Subjects/Keywords: Geometrické parametry koleje; železniční svršek; železniční spodek; odvodnění; železniční přejezdy; technologie práce; rekonstrukce; Track geometry parameters; railway superstructure; railway substructure; drainage; railway crossing; technological procedure of work; reconstruction

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APA (6^th Edition):

Marek, J. (2020). Návrh rekonstrukce železniční tratě Chrudim - Borohrádek mezi km 35,0000 a 38,621 včetně technologie prací: Design Concept of Chrudim - Borohradek Railway Track Reconstruction (section between km 35.000 and km 38.621) with Technological Procedure of Works. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/190825

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):

Marek, Josef. “Návrh rekonstrukce železniční tratě Chrudim - Borohrádek mezi km 35,0000 a 38,621 včetně technologie prací: Design Concept of Chrudim - Borohradek Railway Track Reconstruction (section between km 35.000 and km 38.621) with Technological Procedure of Works.” 2020. Thesis, Brno University of Technology. Accessed March 07, 2021. http://hdl.handle.net/11012/190825.

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

MLA Handbook (7^th Edition):

Marek, Josef. “Návrh rekonstrukce železniční tratě Chrudim - Borohrádek mezi km 35,0000 a 38,621 včetně technologie prací: Design Concept of Chrudim - Borohradek Railway Track Reconstruction (section between km 35.000 and km 38.621) with Technological Procedure of Works.” 2020. Web. 07 Mar 2021.

Vancouver:

Marek J. Návrh rekonstrukce železniční tratě Chrudim - Borohrádek mezi km 35,0000 a 38,621 včetně technologie prací: Design Concept of Chrudim - Borohradek Railway Track Reconstruction (section between km 35.000 and km 38.621) with Technological Procedure of Works. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11012/190825.

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

Council of Science Editors:

Marek J. Návrh rekonstrukce železniční tratě Chrudim - Borohrádek mezi km 35,0000 a 38,621 včetně technologie prací: Design Concept of Chrudim - Borohradek Railway Track Reconstruction (section between km 35.000 and km 38.621) with Technological Procedure of Works. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/190825

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

Brno University of Technology

29. Prikner, Pavel. Rekonstrukce železniční tratě Hanušovice - Jeseník v km 36,65 - 30,9 včetně technologie prací: Reconstruction of Track Section Hanušovice - Jeseník in 36,65 - 30,9 Section with Technological Procedure of Works Design.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/68687

► The aim of the bachelor thesis is to design a reconstruction of a track railway Hanušovice – Jeseník in the track section of km 26,65… (more)

Subjects/Keywords: rekonstrukce; železniční svršek; železniční spodek; železniční přejezd; odvodnění trati; technologie práce; track reconstruction; railway superstructure; track substructure; rail crossing; drainage of track; technological procedure of work

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

APA (6^th Edition):

Prikner, P. (2019). Rekonstrukce železniční tratě Hanušovice - Jeseník v km 36,65 - 30,9 včetně technologie prací: Reconstruction of Track Section Hanušovice - Jeseník in 36,65 - 30,9 Section with Technological Procedure of Works Design. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/68687

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):

Prikner, Pavel. “Rekonstrukce železniční tratě Hanušovice - Jeseník v km 36,65 - 30,9 včetně technologie prací: Reconstruction of Track Section Hanušovice - Jeseník in 36,65 - 30,9 Section with Technological Procedure of Works Design.” 2019. Thesis, Brno University of Technology. Accessed March 07, 2021. http://hdl.handle.net/11012/68687.

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

MLA Handbook (7^th Edition):

Prikner, Pavel. “Rekonstrukce železniční tratě Hanušovice - Jeseník v km 36,65 - 30,9 včetně technologie prací: Reconstruction of Track Section Hanušovice - Jeseník in 36,65 - 30,9 Section with Technological Procedure of Works Design.” 2019. Web. 07 Mar 2021.

Vancouver:

Prikner P. Rekonstrukce železniční tratě Hanušovice - Jeseník v km 36,65 - 30,9 včetně technologie prací: Reconstruction of Track Section Hanušovice - Jeseník in 36,65 - 30,9 Section with Technological Procedure of Works Design. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11012/68687.

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

Council of Science Editors:

Prikner P. Rekonstrukce železniční tratě Hanušovice - Jeseník v km 36,65 - 30,9 včetně technologie prací: Reconstruction of Track Section Hanušovice - Jeseník in 36,65 - 30,9 Section with Technological Procedure of Works Design. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/68687

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

30. Pivot, Odran. Scatter correction for spectral computed tomography : Correction du rayonnement diffusé en tomographie spectrale.

Degree: Docteur es, Traitement du signal et de l'image, 2019, Lyon

URL: http://www.theses.fr/2019LYSEI102

►

Le rayonnement diffusé est une cause majeure de biais, de baisse de contraste et d'artéfacts en tomographie par rayons x. De nombreuses méthode de correction… (more)

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Le rayonnement diffusé est une cause majeure de biais, de baisse de contraste et d'artéfacts en tomographie par rayons x. De nombreuses méthode de correction ont été proposées pour la tomographie conventionnelle (utilisant des détecteurs à intégration en énergie) mais le sujet reste ouvert dans le cadre de l'imagerie spectrale, une nouvelle modalité d'imagerie basée sur l'utilisation de détecteurs à comptage des photons résolus en énergie. L'objectif principal de ce travail de thèse a été l'étude de techniques de correction du diffusé adaptées à l'imagerie spectrale. La solution choisie améliore une méthode de correction développée pour la tomographie conventionnelle qui utilise un masque modulateur de primaire semi-transparent. L'atténuation du masque est d'abord compensée avec une matrice de correction qui bénéficie de l'information spectrale. Les autres contributions sont un modèle de diffusé basé sur des B-splines et qui permet de représenter précisément les images de diffusé à l'aide d'un très faible nombre de paramètres, et une fonction de coût qui prend en compte les structures du masque et de l'objet. Les performances de la matrice de correction, du modèle de diffusé, et de l'ensemble de la méthode de correction proposée ont été évaluées sur des données simulées, en considérant des détecteurs à comptage de photons avec différents nombres de canaux d'énergie. De plus, des acquisitions ont été réalisées sur un système tomographique à faisCEAux en éventail parallèles comportant un détecteur commercial résolu en énergie. La méthode a été validée avec succès dans les cas de deux fantômes dédiés à des mesures de qualité d'images médicales, avec une amélioration remarquable.

Scattered radiation is a major cause of bias, loss of contrast and artifacts in x-ray computed tomography (CT). Many correction methods have been proposed for conventional CT (using energy-integrating detectors) but it is still an open research topic in the field of spectral CT, a novel imaging technique based on the use of energy-selective photon counting detectors. The main objective of the present thesis was to investigate scatter correction techniques adapted to spectral CT. The chosen solution refines a scatter correction method developed for integration-mode CT which uses a semi-transparent primary modulator mask. The attenuation of the primary modulator mask is first compensated for with a correction matrix which takes advantage of the spectral information. The other contributions are a scatter model based on B-splines allowing an accurate representation of scatter maps with the aid of a very few parameters and a cost function which takes into account the structures of the mask and the object. The accuracy of the correction matrix, the scatter model and the whole proposed scatter correction process were tested on simulated data considering photon counting detectors with various numbers of energy bins and have shown a significant bias reduction, contrast enhancement and artifact removal. In addition, physical experiments were performed…

Advisors/Committee Members: Létang, Jean-Michel (thesis director).

Subjects/Keywords: Traitement des images; Imagerie spectrale; Tomographie spectrale; Tomographie par rayon X; Reconstruction tomographique; Détecteur à comptage de photons; Rayonnement diffusé; Rayonnement primaire; Correction du rayonnement secondaire; Image Processing; Spectral imagery; Spectral tomography; X-Ray tomography; Tomographic Reconstruction; Photon counting detector; Scattered radiation; Primary radiation; Scatter Correction; 616.075 707 2

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

APA (6^th Edition):

Pivot, O. (2019). Scatter correction for spectral computed tomography : Correction du rayonnement diffusé en tomographie spectrale. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2019LYSEI102

Chicago Manual of Style (16^th Edition):

Pivot, Odran. “Scatter correction for spectral computed tomography : Correction du rayonnement diffusé en tomographie spectrale.” 2019. Doctoral Dissertation, Lyon. Accessed March 07, 2021. http://www.theses.fr/2019LYSEI102.

MLA Handbook (7^th Edition):

Pivot, Odran. “Scatter correction for spectral computed tomography : Correction du rayonnement diffusé en tomographie spectrale.” 2019. Web. 07 Mar 2021.

Vancouver:

Pivot O. Scatter correction for spectral computed tomography : Correction du rayonnement diffusé en tomographie spectrale. [Internet] [Doctoral dissertation]. Lyon; 2019. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2019LYSEI102.

Council of Science Editors:

Pivot O. Scatter correction for spectral computed tomography : Correction du rayonnement diffusé en tomographie spectrale. [Doctoral Dissertation]. Lyon; 2019. Available from: http://www.theses.fr/2019LYSEI102

Open Access Theses and Dissertations