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Dissertations / Theses on the topic 'Diffusion MR Imaging'

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1

Skare, Stefan. "Optimisation strategies in diffusion tensor MR imaging /." Stockholm, 2002. http://diss.kib.ki.se/2002/91-7349-175-6.

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2

Candrák, Matúš. "Zpracování difuzně vážených obrazů pořízených MR tomografem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220983.

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The semester thesis describes the basic principles of MRI, methods for measuring diffusion coefficients and creating DWI and DTI images. As a result a practical implementation of program was implemented in Matlab, based on theoretical knowledge of the problem.
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3

Bai, Y. "Correcting for motion between acquisitions in diffusion MR imaging." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/18690/.

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The diffusion tensor (DT) and other diffusion models assume that each voxel corresponds to the same anatomical location in all the measurements. Movements and distortions violate this assumption and typically the images are realigned before model fitting. We propose a set of model-based methods to improve motion correction and avoid the errors that the traditional method introduces. The new methods are based on a three-step procedure to register DWI datasets, and use different reference images for DWIs with different gradient directions for registration, so the registrations take into account
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4

MacGillivray, Cathy Carleton University Dissertation Physics. "Diffusion-weighted MR imaging of moving structures using a three echo navigator imaging technique." Ottawa, 1996.

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5

Domenig, Claudia. "Development and evaluation of MR imaging techniques for quantitative diffusion imaging of the human pelvis." Thesis, University of Surrey, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273242.

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6

Kerttula, L. (Liisa). "Magnetic resonance imaging of the intervertebral disc:post-traumatic findings and the value of diffusion-weighted MR imaging." Doctoral thesis, University of Oulu, 2001. http://urn.fi/urn:isbn:9514264711.

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Abstract Magnetic resonance imaging (MRI) provides important information about structural and biochemical changes in organs. MRI is also an effective imaging method for the evaluation of spinal disorders. However, many of its potential applications - particularly diffusion imaging - have not yet been thoroughly explored. The purpose of this study was to determine the MRI-detectable changes in the intervertebral disc after trauma and to test the feasibility of diffusion-weighted MR imaging of the intervertebral discs. A minipig model was used in the experimental study to determine the MRI c
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7

Gong, Nanjie, and 龔南杰. "Probing tissue microstructural changes in neurodegenerative processes using non-gaussian diffusion MR imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208583.

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Development of non-invasive imaging biomarkers sensitive to microstructural organization is crucial for deepening our understanding of mechanisms underlying neurodegenerative processes such as aging and further improving early diagnosis and monitoring of neurodegenerative disease such as Alzheimer’s disease (AD) and amnestic mild cognitive impairment (MCI). The diffusional kurtosis imaging (DKI) is an extension of conventional diffusion tensor imaging. It is hypothesized that DKI will provide complementary information to conventional diffusivity metrics in a new dimension that will more compre
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8

Coope, David John. "Use of [11C]-methionine PET and diffusion-/perfusion-weighted MR imaging in gliomas." Thesis, University of Manchester, 2010. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:207525.

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Introduction: Low-grade gliomas are a sub-group of primary brain tumours that typically affect young adults and which present specific challenges to conventional diagnostic imaging. They demonstrate a pattern of growth whereby tumour cells infiltrate healthy brain tissue without distortion of the surrounding brain or blood-brain barrier integrity. These features limit the capacity of conventional neuro-imaging strategies to effectively delineate the tumour extent or characterise the degree of 'malignancy'. One solution is to apply multiple imaging modalities to image different aspects of the t
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9

Tamai, Ken. "The utility of diffusion-weighted MR imaging in the diagnosis of uterine malignancy." Kyoto University, 2008. http://hdl.handle.net/2433/135802.

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10

Iima, Mami. "Apparent Diffusion Coefficient as an MR Imaging Biomarker of Low-Risk Ductal Carcinoma in Situ: A Pilot Study." Kyoto University, 2014. http://hdl.handle.net/2433/188640.

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11

Thuen, Marte. "Manganese-enhanced and diffusion tensor MR imaging of the normal, injured and regenerating rat visual pathway." Doctoral thesis, Norwegian University of Science and Technology, Department of Circulation and Medical Imaging, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2269.

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12

Ho, Nga-yee. "Longitudinal study of white matter fractional anisotropy in childhood medulloblastoma survivors by diffusion tensor MR imaging." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B39849041.

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13

Ho, Nga-yee, and 何雅儀. "Longitudinal study of white matter fractional anisotropy in childhood medulloblastoma survivors by diffusion tensor MR imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B39849041.

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14

Wang, Silun, and 王思倫. "Diffusion tensor MR imaging as a biomarker for the evaluation of whitematter injury in rodent models." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43085416.

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15

Khong, Pek-Lan. "Diffusion tensor MR imaging in the evaluation of treatment-induced white matter injury in childhood cancer survivors." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38320666.

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16

Khong, Pek-Lan, and 孔碧蘭. "Diffusion tensor MR imaging in the evaluation of treatment-induced white matter injury in childhood cancer survivors." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38320666.

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17

Wang, Silun. "Diffusion tensor MR imaging as a biomarker for the evaluation of white matter injury in rodent models." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43085416.

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18

Nazaran, Amin. "Ultra Short MR Relaxometry and Histological Image Processing for Validation of Diffusion MRI." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6348.

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Magnetic Resonance Imaging (MRI) is an imaging modality that acquires an image with little to no damage to the tissue. MRI does not introduce foreign particles or high energy radiation into the body, making it one of the least invasive medical imaging modalities. MRI can achieve excellent soft tissue contrast and is therefore useful for diagnosis of a wide variety of diseases. While there are a wide variety of available techniques for generating contrast in MRI, there are still many open areas for research. For example, many tissues in the human body exhibit such rapid signal decay that they a
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19

Kanao, Shotaro. "Differentiating benign and malignant inflammatory breast lesions: Value of T2 weighted and diffusion weighted MR images." Kyoto University, 2019. http://hdl.handle.net/2433/236592.

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20

Wang, Yanxin. "Hypoxic-ischemic injury in the neonatal rat model prediction of irreversible infarction size by Diffusion Weighted MR Imaging /." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B35757577.

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21

Thörmer, Gregor. "Diagnostischer Wert von ADC-Parameterkarten in der MR-Diagnostik des Prostatakarzinoms: Einfluss der Wahl verschiedener b-Werte." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-105124.

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Zielsetzung: Die diffusionsgewichtete Bildgebung ist wesentlicher Bestandteil der Magnetresonanz-tomographie des Prostatakarzinoms (PCa). Aus entsprechenden Rohdaten, aufgenommen bei verschie-denen b-Werten (Diffusionswichtungsfaktoren), kann der Diffusionskoeffizient (apparent diffusion coefficient - ADC) abgeschätzt werden, der ein sensitiver Indikator für maligne Veränderungen der Gewebearchitektur ist. Die absoluten ADC-Werte sind allerdings stark von der Wahl der zugrundeliegenden b-Werte abhängig und darüber hinaus gibt es Hinweise, dass die Wahl der b-Werte einen signifikanten Einfluss
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22

Stahle, Jessica Anne. "Diffusion Weighted MR Imaging in the Differentiation between Metastatic and Benign Lymph Nodes in Canine Patients with Head and Neck Disease." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/86612.

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In dogs with large primary tumors, regional lymph node involvement or evidence of distant metastasis can have worse prognoses and significantly decreased survival. Lymph node size alone has been shown to be insufficient as a predictor for the accurate clinical staging of some canine neoplasia, including oral malignant melanoma. However, regional lymph nodes of the oral cavity, such as the medial retropharyngeal lymph nodes, are difficult to access for routine sampling. Diffusion weighted magnetic resonance imaging (DWI) has demonstrated the ability to differentiate metastatic from inflammator
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23

Okada, Tsutomu. "Diffusion tensor fiber tractography at 3.0-T MR imaging : visualization of eloquent fiber tracts and application to the tractography-guided neurosurgery." Kyoto University, 2007. http://hdl.handle.net/2433/135663.

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24

Owler, Brian Kenneth. "Pathophysiology of normal pressure hydrocephalus." University of Sydney. Surgery, 2004. http://hdl.handle.net/2123/685.

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Normal pressure hydrocephalus (NPH), a CSF circulation disorder, is important as a reversible cause of gait and cognitive disturbance in an aging population. The inconsistent response to CSF shunting is usually attributed to difficulties in differential diagnosis or co-morbidity. Improving outcome depends on an increased understanding of the pathophysiology of NPH. Specifically, this thesis examines the contribution of, and inter-relationship between, the brain parenchyma and CSF circulation in the pathophysiology of NPH. Of the four core studies of the thesis, the first quantifies the chara
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25

Purvis, Nina Louise. "Classification of breast malignancy using optimised advanced diffusion-weighted imaging, and, Surgical planning for breast tumour resection using MR-guided focused ultrasound." Thesis, University of Hull, 2016. http://hydra.hull.ac.uk/resources/hull:15193.

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Intravoxel Incoherent Motion Imaging (IVIM) is a non-invasive MR-imaging technique that enables the measurement of cellularity and vascularity using diffusion-weighted (DW)-imaging. IVIM has been applied to various cancer types including breast cancer, and is becoming more popular but lacks standardisation. The quantitative parameters; diffusion, D, perfusion fraction, f, and pseudo micro capillary diffusion, D* are thought to be correlated with tumour physiognomies such as proliferation, angiogenesis and heterogeneity. In Part 1 of this thesis, an optimised clinical b-value protocol is produc
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26

Filipiak, Isabelle. "IRM de diffusion des fibres blanches cérébrales : développement et validation d'un objet-test." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR3311/document.

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L'imagerie en tenseur de diffusion (DTI) est basée sur la mesure de la mobilité des molécules d'eau permettant l'analyse de la microarchitecture du tissu cérébral. Le trajet des fibres blanches peut être alors reconstruit par des méthodes de tractographie déterministes basées sur la direction principale de la diffusion. Toutefois elle repose sur des outils mathématiques complexes donnant un regard indirect sur les structures anatomiques, et sa validation est un enjeu majeur. Notre objectif a été de concevoir un objet-Test (OT) tri-Dimensionnel permettant la validation de la diffusion dans des
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27

Ruoss, Kerstin Andrea. "1. Brain development (sulci and gyri) as assessed by MR imaging in preterm and term newborn infants. 2. Germinal matrix hemorrhage and white matter lesions in neonates; correlation of serial ultrasound and early magnetic resonance imaging findings. 3. Diffusion-weighted MRI of middle cerebral artery stroke in a newborn /." Bern, 2002. http://www.stub.unibe.ch/html/haupt/datenbanken/diss/bestell.html.

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28

Martens, Corentin. "Patient-Derived Tumour Growth Modelling from Multi-Parametric Analysis of Combined Dynamic PET/MR Data." Doctoral thesis, Universite Libre de Bruxelles, 2021. https://dipot.ulb.ac.be/dspace/bitstream/2013/320127/5/contratCM.pdf.

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Gliomas are the most common primary brain tumours and are associated with poor prognosis. Among them, diffuse gliomas – which include their most aggressive form glioblastoma (GBM) – are known to be highly infiltrative. The diagnosis and follow-up of gliomas rely on positron emission tomography (PET) and magnetic resonance imaging (MRI). However, these imaging techniques do not currently allow to assess the whole extent of such infiltrative tumours nor to anticipate their preferred invasion patterns, leading to sub-optimal treatment planning. Mathematical tumour growth modelling has been propos
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29

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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30

Borges, Renato Callado. "Ferramentas computacionais para a síntese de imagens de difusão por ressonância magnética." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-23042014-120357/.

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Trabalhos anteriores sobre a síntese de imagens de difusão por ressonância magnética se limitaram a estudos sobre estruturas microscópicas, menores que as dimensões típicas de um voxel (e.g., [BF08] [BF13] [LFS + 10] e [BA94]). Isto decorre em parte devido às metodologias utilizadas, que têm como ponto em comum serem simulações de tipo Monte Carlo, nas quais os elementos mínimos da simulação são as partículas de água. Portanto o custo computacional destas simulações é proporcional ao número de partículas a simular, e isto limita os volumes que podem ser simulados a tamanhos microscópicos. Prop
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31

Ko, Ching-Chung, and 柯景中. "Applications of Diffusion-Weighted MR Imaging in Brain Tumors." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/tytjh5.

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博士<br>國立中山大學<br>生物醫學研究所<br>106<br>Although magnetic resonance imaging (MRI) had been used to diagnose brain tumors for a long time, the differentiation of brain tumors is still difficult in some situations. In addition, it is difficult to predict recurrence of brain tumors on conventional qualitative MR imaging. Nowadays, the diffusion-weighted MR imaging (DWI) is already being incorporated into daily clinical practice in neuroradiology, and quantitative apparent diffusion coefficient (ADC) value could be acquired in DWI. Among brain tumors, the differentiation between glioblastoma multiforme
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32

Fichtner, Nicole Damara. "MR Diffusion Measurements of Apoptotic Changes in Tumour Cells." Thesis, 2013. http://hdl.handle.net/1807/35606.

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Monitoring treatment efficacy is a large area of cancer research as it can increase the effectiveness of therapy regimens. Diffusion weighted Magnetic Resonance imaging (DWI), allows assessment of tissue microstructure without exogenous contrast agents. In this thesis, two different DWI techniques were used to acquire data from acute myeloid leukemia cells undergoing apoptosis, and data was fitted to an analytical model of re- stricted diffusion. Results indicated a decrease in average restriction size from 6.4 to 2.7μm, and an increase in the restricted diffusion coefficient from 0.17 to 0.82
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"Diffusion-Weighted MR Imaging: Behaviors of Phenomenological Models and Enhanced PROPELLER Data Acquisition." Doctoral diss., 2012. http://hdl.handle.net/2286/R.I.15836.

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abstract: The aim of this study was to investigate the microstructural sensitivity of the statistical distribution and diffusion kurtosis (DKI) models of non-monoexponential signal attenuation in the brain using diffusion-weighted MRI (DWI). We first developed a simulation of 2-D water diffusion inside simulated tissue consisting of semi-permeable cells and a variable cell size. We simulated a DWI acquisition using a pulsed gradient spin echo (PGSE) pulse sequence, and fitted the models to the simulated DWI signals using b-values up to 2500 s/mm2. For comparison, we calculated the apparent dif
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34

Lee, Cheng-Hui, and 李正輝. "The application of SPIO-contrast agent used for liver MR diffusion weighted imaging." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/81526355894511062854.

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碩士<br>中原大學<br>醫學工程研究所<br>97<br>Hepatic tumor was the top of deadly diseases for male and the second deadly diseases for female in Taiwan. Traditional, physical examination, laboratory blood test and medical imaging including computer tomography (CT), ultrasound and magnetic resonance imaging (MRI) were used for hepatic lesions diagnosis. The purpose of this study is to evaluate the accuracy of hepatic lesion detection after Super paramagnetic iron oxide (SPIO) injection followed by diffusion weighted imaging (DWI). Ten patients with suspected hepatic tumors were recruited for this study. For e
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35

Yang, Yu-Ting, and 楊玉婷. "Monitoring Brain Neural Development in New Zealand Rabbit Using MR Diffusion Tensor Imaging." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/72319824499474955924.

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碩士<br>義守大學<br>生物醫學工程學系<br>101<br>Diffusion tensor imaging (DTI), a novel non-invasive method of magnetic resonance imaging (MRI), has been wildly used in neurophysiology, neurons anatomy and multiple sclerosis diagnosis and research. Brain white matter tracts’ fractional anisotropy (FA) was significantly higher than gray matter, and sensitive to white matter in diffusion tensor imaging as well. Diffusion anisotropy changes with diseases and also with neural developments. Therefore, diffusion tensor imaging was used to acquire image data and to investigate changes in regional diffusion quantita
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36

Yi-Hsin, Nieh, and 聶伊辛. "The Evaluation of Diffusion-Weighted MR Imaging Damage Area Analysis for Patients with Acute Infarction Stroke." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/nug3s4.

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碩士<br>元培科學技術學院<br>影像醫學研究所<br>95<br>Diffusion-weighted MR Imaging is the most important clinical tools for diagnosis of acute brain infraction. This research takes advantage of all sorts of different image analysis technology that direct to brain infraction images of Magnetic Resonance proceed dispose, and automatization technology precise brain tissue damage area to replace artificial manual trouble and not precise. In the study, five different edge detection algorithms ( namely Roberts algorithm, Sobel algorithm, Laplacian algorithm, Marr-Hildreth algorithm and Canny algorithm ) have been app
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37

Shen, Elise Ting-Hsin, and 沈廷馨. "Diffusion MR Imaging Progression of Structural Connectivity and Therapeutic Potential of Deep Brain Stimulation in Alzheimer’s Disease Model." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/g442hw.

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碩士<br>國立臺灣大學<br>醫學工程學研究所<br>105<br>Alzheimer’s disease (AD) is one of the major causes of death that currently cannot be cured, prevented, or slowed. Due to the rising survival age, the upward trend of the disease prevalence will continue. Deep brain stimulation (DBS) has proven to be a viable therapy for various neurological disorders, by enhancing or interrupting different connections within the brain. Various brain structures have been considered as the target for DBS, including the fornix. DBS of the fornix, a major output tract of the hippocampus, has been shown to be a promising target f
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38

Thörmer, Gregor. "Diagnostischer Wert von ADC-Parameterkarten in der MR-Diagnostik des Prostatakarzinoms: Einfluss der Wahl verschiedener b-Werte." Doctoral thesis, 2012. https://ul.qucosa.de/id/qucosa%3A11837.

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Zielsetzung: Die diffusionsgewichtete Bildgebung ist wesentlicher Bestandteil der Magnetresonanz-tomographie des Prostatakarzinoms (PCa). Aus entsprechenden Rohdaten, aufgenommen bei verschie-denen b-Werten (Diffusionswichtungsfaktoren), kann der Diffusionskoeffizient (apparent diffusion coefficient - ADC) abgeschätzt werden, der ein sensitiver Indikator für maligne Veränderungen der Gewebearchitektur ist. Die absoluten ADC-Werte sind allerdings stark von der Wahl der zugrundeliegenden b-Werte abhängig und darüber hinaus gibt es Hinweise, dass die Wahl der b-Werte einen signifikanten Einfluss
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Meddour, Miriam. "MR-tomographische Darstellung intracerebraler Blutungen mit und ohne Therapie." Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B180-D.

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