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Dissertations / Theses on the topic 'Diffusion CT'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Mosavi, Firas. "Whole-Body MRI including Diffusion-Weighted Imaging in Oncology." Doctoral thesis, Uppsala universitet, Enheten för radiologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-209777.

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Cancer is one of the major causes of worldwide mortality. Imaging plays a vital role in the staging, follow-up, and evaluation of therapeutic response in cancer patients. Whole-body (WB) magnetic resonance imaging (MRI), as a non-ionizing imaging technique, is a promising procedure to assess tumor spreading in a single examination. New MRI technological developments now enable the application of diffusion-weighted imaging (DWI) of the entire body. DWI reflects the random motion of water molecules and provides functional information of body tissues. DWI can be quantified with the use of the app

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2

Takahashi, Hiroaki, Yoshimi Seida, and Mikazu Yui. "3D X-ray CT and diffusion measurements to assess tortuosity and constrictivity in a sedimentary rock." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-191088.

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3

Takahashi, Hiroaki, Yoshimi Seida, and Mikazu Yui. "3D X-ray CT and diffusion measurements to assess tortuosity and constrictivity in a sedimentary rock." Diffusion fundamentals 11 (2009) 89, S. 1-11, 2009. https://ul.qucosa.de/id/qucosa%3A14061.

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A high-resolution, three-dimensional (3D) image of the interior of the sedimentary rock was obtained by means of nano-focus X-ray computer tomography (X-ray CT). Using computational methods to analyze the 3D microstructure of the rock, we presented the tortuosity and geometrical constrictivity. We also presented results on the tritiated water (HTO) diffusion tests and a mercury intrusion porosimetry (MIP) test performed on the rock. We have compared these results to understand the dominant parameters that control diffusion of HTO in the present system. These results suggest that the dominant p

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4

Peyrat, Jean-Marc. "Comparison of cardiac anatomy and function : statistics on fibre architecture form DT-MRI and registration of 4D CT images." Nice, 2009. http://www.theses.fr/2009NICE4053.

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Ce travail de thèse s'est consacré à la comparaison de l'anatomie et de la fonction cardiaques à partir d'images médicales. La première partie de la thèse se concentre sur l'anatomie cardiaque avec une étude statistique de l'architecture des fibres musculaires du cœur à partir d'imagerie par résonance magnétique du tenseur de diffusion (IRM-TD). Dans la deuxième partie est proposée une comparaison conjointe de l'anatomie et de la fonction cardiaque par le recalage non-linéaire spatiotemporel de deux séquences 4D CT de différents patients ou du même patient à différents instants. L'architecture

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5

Peyrat, Jean-Marc. "Comparaison de l'Anatomie et de la Fonction Cardiaque : Statistiques sur l'Architecture des Fibres et Recalage d'Images 4D CT." Phd thesis, Université de Nice Sophia-Antipolis, 2009. http://tel.archives-ouvertes.fr/tel-00635292.

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Ce travail de thèse s'est consacré à la comparaison de l'anatomie et de la fonction cardiaques à partir d'images médicales. Une première partie se concentre sur l'anatomie cardiaque avec une étude statistique de l'architecture des bres musculaires du c÷ur à partir d'IRM de tenseur de di usion. Dans la deuxième partie est proposée une comparaison la fonction cardiaque de di érents patients ou du même patient a di érents instants par le recalage spatiotemporel de séquences 4D CT. La complexe organisation des bres musculaires cardiaques a un rôle très important dans le comportement électrique et

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6

Nunn, Jacob. "Investigations of Partial Gas Saturation on Diffusion in Low-permeability Sedimentary Rocks." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38396.

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The effect of partially saturated conditions on aqueous diffusion was investigated on the Upper Ordovician Queenston Formation shale from the Michigan Basin of southwest Ontario, Canada. Effective diffusion coefficients (De) were determined for iodide tracer on duplicate cm-scale samples from a core segment. Partially saturated conditions were created with a new gas-ingrowth method that takes advantage of the variability of N2 solubility with pressure. The method is designed to create partially saturated pores, quantify the level of partial gas/brine saturation within the tracer-accessible por

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7

Gu, Jing, and 谷静. "Multiparametric imaging using diffusion and dynamic-contrast enhanced MRI, and 18F-FDG PET/CT in the evaluation of primary rectal cancer andmalignant lymphoma." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47027174.

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8

Fabien, Aurélie Jessica. "Etude du couplage comportement hydromécanique – durabilité dans le béton de la structure : application à la maquette MAREVA." Nantes, 2012. http://www.theses.fr/2012NANT2090.

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9

Maiwald, Bettina, Donald Lobsien, Thomas Kahn, and Patrick Stumpp. "Is 3-Tesla Gd-EOB-DTPA-enhanced MRI with diffusion-weighted imaging superior to 64-slice contrast-enhanced CT for the diagnosis of hepatocellular carcinoma?" Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-155190.

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Objectives: To compare 64-slice contrast-enhanced computed tomography (CT) with 3-Tesla magnetic resonance imaging (MRI) using Gd-EOB-DTPA for the diagnosis of hepatocellular carcinoma (HCC) and evaluate the utility of diffusion-weighted imaging (DWI) in this setting. Methods: 3-phase-liver-CT was performed in fifty patients (42 male, 8 female) with suspected or proven HCC. The patients were subjected to a 3-Tesla-MRI-examination with Gd-EOB-DTPA and diffusion weighted imaging (DWI) at b-values of 0, 50 and 400 s/mm2. The apparent diffusion coefficient (ADC)-value was determined for each lesio

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10

Cunningham, Dustin T. "Fusion of Multimodal Neuroimaging for Deep Brain Stimulation Studies." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337895443.

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11

Mirus, Matthew M., Sergey V. Tokalov, Gerald Wolf, Jerilyn Heinold, V. Prochnow, and Nasreddin Abolmaali. "Noninvasive assessment and quantification of tumour vascularisation using MRI and CT in a tumour model with modifiable angiogenesis – An animal experimental prospective cohort study." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232305.

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Background To investigate vascular-related pathophysiological characteristics of two human lung cancers with modifiable vascularisation using MRI and CT. Methods Tumour xenografts with modifiable vascularisation were established in 71 rats (approval by the Animal Care Committee was obtained) by subcutaneous transplantation of two human non-small-cell lung cancer (NSCLC) cells (A549, H1299) either alone or co-transplanted with vascular growth promoters. The vascularity of the tumours was assessed noninvasively by MRI diffusion-weighted-imaging (DWI), T2-weighted, and time-of-flight (TOF) seque

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12

Mesguich, Charles. "Apport de l’imagerie fonctionnelle par TEP dans la prise en charge diagnostique et thérapeutique du myélome multiple et comparaison à l’IRM de diffusion." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0229.

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Les changements thérapeutiques durant la dernière décennie ont contribué à une amélioration de la survie du Myélome Multiple (MM). Cela s’est accompagné de l’utilisation de nouveaux outils d’imagerie corps-entier, tels que la TEP-TDM au 18-FDG (TEP-FDG) et l’IRM, remplaçant les radiographies standards, à des fins diagnostiques mais également d’évaluation thérapeutique. Chacune de ces modalités présente cependant ses limites. L’imagerie de diffusion en IRM, l’analyse de l’hétérogénéité tumorale aidée des techniques d’intelligence artificielle (IA) ainsi que le développement de nouveaux radiotra

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13

Araújo, Susana Vasconcelos 1984. "Diffusion and swelling of CO2/light oil mixtures using pressure decay and CT-scan = Difusão e inchamento de misturas de CO2/óleo leve usando as técnicas de queda de pressão e de tomografia computadorizada." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265948.

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Orientador: Osvair Vidal Trevisan<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências<br>Made available in DSpace on 2018-08-25T01:17:03Z (GMT). No. of bitstreams: 1 Araujo_SusanaVasconcelos_M.pdf: 2255387 bytes, checksum: dda0bb2a99db1fae70648bf6282ce8f6 (MD5) Previous issue date: 2014<br>Resumo: O CO2 utilizado na recuperação avançada em reservatórios de petróleo é um importante agente de injeção devido a suas características de miscibilidade e de inchamento. No que tange a miscibilidade, a difusão molecular é o process

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14

Varoquaux, Arthur Damien. "Evaluation clinique et expérimentale des nouvelles modalités d'imagerie dans la prise en charge des néoplasies ORL notamment par la TEP/IRM." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM5058.

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En oncologie ORL, l'imagerie multiparamétrique est utilisée par un nombre grandissant d'équipes. Parmi les bio-marqueurs, la captation normalisée du fluoro-désoxyglucose (SUV-FDG) en tomoscintigraphie par émission de positons (TEP) et la restriction de la diffusion en IRM (DWI-MRI) sont les plus utilisées.L'IRM couplée à la TEP (TEP/IRM) est une nouveauté qui permet une diminution très significative des doses d'irradiation délivrées par rapport à la TEP/TDM. Nous adressons notre première expérience concernant l'aspect en diffusion et en TEP/IRM dans la surveillance des patients après radio-chi

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15

Koubar, Khodor. "Amélioration du calcul de la masse osseuse par micro-tomodensitométrie X : prise en compte des phénomènes physiques." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01062827.

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Suite à l'allongement de la survie des patients atteints de la mucoviscidose (CF), des études ont montré la présence d'une perte osseuse chez les patients CF. Dans ce travail de thèse, une étude de l'évolution de la densité minérale osseuse chez des souris atteintes de mucoviscidose a été effectuée en utilisant un système de micro-tomodensitométrie X. Afin d'améliorer les précisions des mesure, deux méthodes de correction de deux phénomènes physiques ont été appliquées. La première méthode est une correction du durcissement de faisceau X et basée sur une segmentation de l'objet reconstruit apr

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16

Kassem, Emad Abdel-Rahman Ahmed. "Compaction Effects on Uniformity, Moisture Diffusion, and Mechanical Properties of Asphalt Pavements." Thesis, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-242.

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Field compaction of asphalt mixtures is an important process that influences performance of asphalt pavements; however there is very little effort devoted to evaluate the influence of compaction on the uniformity and properties of asphalt mixtures. The first part of this study evaluated relationships between different field compaction patterns and the uniformity of air void distribution in asphalt pavements. A number of projects with different asphalt mixture types were compacted, and cores were taken at different locations from these projects. The X-ray Computed Tomography (X-ray CT) system w

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17

Lim, Cheol Woong. "Mathematical analysis of the lithium ion transport in lithium ion batteries using three dimensional reconstructed electrodes." 2012. http://hdl.handle.net/1805/3419.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>Computational analysis of lithium ion batteries has been improved since Newman and et al. suggested the porous electrode theory. It assumed the electrode as a simple structure of homogeneous spherical particles. Bruggeman relationship which characterizes porous material by a simple equation was adopted in the homogeneous electrode model instead of the electrode morphology. To improve the prediction of a cell performance, the numerical analysis requires the realistic microstructure of the cell. Based on the experimentally determ

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18

Pietragalla, Michele. "Role of both pre-treatment CT in the upper respiratory airways pathology of cystic fibrosis patients and MRI Diffusion (DwI) - perfusion (DCE-PwI) in diagnosis, predicting pre- treatment response and treatment monitoring in head and neck neoplasms." Doctoral thesis, 2022. http://hdl.handle.net/2158/1260674.

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STUDIO 1 I pazienti affetti da fibrosi cistica (FC) sviluppano frequentemente quadri di rinosinusite cronica con necessità di ricorso alla chirurgia endoscopica (FESS). La conoscenza pre-chirurgica dell’esatta anatomia dei seni paranasali è fondamentale per ridurre al minimo le complicanze intra-operatorie. Lo scopo dello studio è stato valutare l’incidenza di varianti anatomiche all'immaging di Tomografia Computerizzata nei pazienti affetti da FC che possono influire sull’incidenza di complicanze maggiori durante FESS. I risultati hanno dimostrato che, nonostante la maggiore complessità ana

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19

Kang, Catherine. "Neuroprotective Drug Delivery to the Injured Spinal Cord with Hyaluronan and Methylcellulose." Thesis, 2010. http://hdl.handle.net/1807/24777.

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Traumatic spinal cord injury (SCI) is a devastating condition for which there is no effective clinical treatment. Neuroprotective molecules that minimize tissue loss have shown promising results; however systemic delivery may limit in vivo benefits due to short systemic half-life and minimal passage across the blood-spinal cord barrier. To overcome these limitations, an injectable intrathecal delivery vehicle comprised of hyaluronan and methylcellulose (HAMC) was developed, and previously demonstrated to be safe and biocompatible intrathecally. Here, HAMC was determined to persist in the in

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