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Tesis sobre el tema "MRI spine"

Autor: Grafiati
Publicado: 7 de junio de 2025
Última modificación: 2 de agosto de 2025

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1

Ries, Mario. "Diffusion MRI of human spine and kidney : Technological aspects and interpretation." Bordeaux 1, 2001. http://www.theses.fr/2001BOR12360.

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La mesure locale de la constante de diffusion fournit des informations sur l'environ-nement microscopique cellulaire des molécules d'eau. L'information sur la microstructure issue des images IRM de diffusion peut servir à déterminer la structure des fibres neu-ronales. Bien que cette possibilité soit très prometteuse pour le diagnostic, son applica-tion en routine clinique a été jusqu'à ce jour rendue difficile par le fait que la géométrie complexe des structures fibreuses du cerveau complique le traitement des données et l'interprétation des résultats. Le travail présenté dans cet ouvrage a é
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2

Lootus, Meelis. "Automated radiological analysis of spinal MRI." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:5820edfd-fe18-4f3c-9db3-204db75c09c2.

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This thesis addresses the problem of analysing clinical MRI using modern computer vision methods for a variety of clinical and research-related tasks. We use automated machine learning algorithms to develop a spinal MRI analysis framework for a number of tasks such as vertebrae detection, labelling; disc and vertebrae segmentation, and radiological grading, and we validate the framework on a large, heterogeneous dataset of 300 symptomatic back pain patients from multiple clinical sites and scanners. Our framework has a number of back pain research and other spine-related clinical applications
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3

Dalca, Adrian Vasile. "Segmentation of nerve bundles and ganglia in spine MRI using particle filters." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/75654.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 41-44).<br>Automatic segmentation of spinal nerve bundles originating within the dural sac and exiting the spinal canal is important for diagnosis and surgical planning. The variability in intensity, contrast, shape and direction of nerves seen in high resolution myelographic MR images makes segmentation a challenging task. In this thesis, we present an automatic tracking method for segmentation of
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4

ZHONG, JIA. "AUTOMATED VERTEBRA SEGMENTATION AND QUANTIFICATION ALGORITHM OF WHOLE SPINE MR IMAGES." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1090849508.

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5

Leisti, E. L. (Eeva-Liisa). "Radiologic findings of the head and spine in neurofibromatosis 1 (NF1) in Northern Finland." Doctoral thesis, University of Oulu, 2003. http://urn.fi/urn:isbn:9514271394.

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Abstract Imaging of the head and spine with CT and/or MRI was performed on 125 Northern Finnish NF1 patients to evaluate the CNS lesions in patients of different ages and their role in diagnosis and follow-up. Manifestations of NF1 in the head were more common in children than in adults. 77% of the children and 33% of the adults had T2 hyperintense brain lesions. Optic gliomas were present in 29% of the patients, in 44% of the children and 10 % of the adults. 8% of the patients had other intracranial tumours . Spinal lesions were seen in 75% of the patients. Hyperintense T2 lesions were mos
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6

Fleming, Mark Alexander. "How does pre-reduction MRI affect surgeon's behaviour when reducing Distraction-Flexion injuries of the cervical spine?" Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/2840.

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7

Benitez, Mendieta Jessica. "An efficient and semiautomatic segmentation method for 3D surface reconstruction of the lumbar spine from Magnetic Resonance Imaging (MRI)." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/101274/1/Jessica_Benitez%20Mendieta_Thesis.pdf.

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A new semiautomatic technique for the segmentation and reconstruction of 3D vertebral anatomy from MRI is presented where five cadaveric human lumbar spines and one ovine spine were used. The MR images were subjected to contrast enhancement, anisotropic diffusion filtering, and thresholding was selected as the preferable segmentation technique to create 3D surfaces from the MRI datasets. The reconstructions were manually cleaned using commercial software. The resulting reconstructed surface included discrete vertebral bodies with distinct separation between the spinous processes. CT reconstruc
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8

Jennings, Hardy Alastair. "Three-dimensional analysis of vertebral growth and deformity progression in adolescent idiopathic scoliosis using Mri." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/207063/1/Hardy_Jennings_Thesis.pdf.

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This thesis is a study assessing the three-dimensional growth at the apical vertebral body in adolescent idiopathic scoliosis (AIS). It utilized a novel reconstruction and alignment technique utilizing non-harmful magnetic resonance imaging scans to quantitively demonstrate growth asymmetry in AIS patients with progressive deformity, with aims to further understanding of the progressive deformity in this condition.
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9

Keenan, Bethany Elin. "Medical imaging and Biomechanical analysis of scoliosis progression in the growing adolescent spine." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84532/1/Bethany%20Elin_Keenan_Thesis.pdf.

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Progression of spinal deformity in children was studied with Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) to identify how gravity affects the deformity and to determine the full three-dimensional character of the deformity. The CT study showed that gravity is significant in deformity progression in some patients which has implications for clinical patient management. The world first MRI study showed that the standard clinical measure used to define the extent of the deformity is inadequate and further use of three-dimensional MRI should be considered by spinal surgeons.
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10

Pettersson, Kurt. "Whiplash injury : a clinical, radiographic and psychological investigation." Doctoral thesis, Umeå universitet, Ortopedi, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-96904.

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Whiplash injury is a common and troublesome disorder and approximately 10-40 per cent of its victims develop chronic symptoms. The annual incidence is estimated at 1/1000 inhabitants and the prevalence at 1%. The cause of chronic symptoms after whiplash injury is still unknown and no effective treatment has been presented so far. The present study is divided into two parts; the first part includes clinical, radiographic and psychological investigations, and the second part the effect of surgical intervention as well as intervention with medication. MRI studies (n=39) showed a larger proportion
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11

Takatalo, J. (Jani). "Degenerative findings on MRI of the lumbar spine:prevalence, environmental determinants and association with low back symptoms." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526207834.

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Abstract Earlier studies on lumbar degenerative imaging findings in magnetic resonance imaging (MRI) have been done mainly in adult populations and the associations of degenerative findings with low back pain (LBP) are controversial. Only a few studies have involved adolescents and young adults. Heritability has been acknowledged as the only explicit risk factor of disc degeneration (DD). This study investigated the prevalence and environmental determinant of lumbar degenerative findings in MRI and their association with low back symptoms among young adults. The data were based on two physical
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12

Mahato, Niladri Kumar. "Development of Novel Imaging and Image Modeling Techniques for the Assessment andQuantification of Inter-Vertebral Motion Using MRI." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1470841487.

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13

Cargill, Sara C. "Novel methodologies for three-dimensional modelling of subject specific biomechanics : application to lumbopelvic mechanics in sitting and standing." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/18321/1/Sara_Cargill_Thesis.pdf.

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This project presented a biomechanical model of the lumbosacral spine and pelvis, including novel methodologies associated with the measurement of human mechanics. This research has, for the first time, produced accurate three-dimensional geometric models of the human skeleton from living subjects using magnetic resonance imaging technology, enabling the prediction of physiological muscle action within individuals. The model was used to examine changes in the mechanics of the lumbopelvic musculoskeletal system between the standing and seated postures due to the increasing prevalence of the se
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14

Cargill, Sara C. "Novel methodologies for three-dimensional modelling of subject specific biomechanics : application to lumbopelvic mechanics in sitting and standing." Queensland University of Technology, 2008. http://eprints.qut.edu.au/18321/.

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This project presented a biomechanical model of the lumbosacral spine and pelvis, including novel methodologies associated with the measurement of human mechanics. This research has, for the first time, produced accurate three-dimensional geometric models of the human skeleton from living subjects using magnetic resonance imaging technology, enabling the prediction of physiological muscle action within individuals. The model was used to examine changes in the mechanics of the lumbopelvic musculoskeletal system between the standing and seated postures due to the increasing prevalence of the se
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15

Lorenzin, Mariagrazia. "Spine and sacroiliac joints on nuclear magnetic resonance imaging and research of serological biomarkers predictive of severity and disease activity in early axial spondyloarthritis." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3424857.

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Recently several studies have focused on the use of magnetic resonance imaging (MRI) and new biomarkers that might facilitate early diagnosis of axial spondyloarthritis (axSpA) and identify individuals at higher risk of developing the disease. Objectives:The study aimed to identify:1)potentially useful biomarkers for early diagnosis of axSpA and their correlations with disease activity and imaging indices;2)the prevalence of spine and pelvis MRI lesions in patients (pts) with low back pain (LBP);3)the correlation between the site of axial pain and of MRI-lesions.Material and Methods:Seventy-tw
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16

Troalen, Thomas. "IRM quantitative de la perfusion myocardique par marquage de spins artériels = Quantitative myocardial perfusion MRI using arterial spin labeling." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM5006/document.

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La perfusion est un facteur important dans la viabilité et la fonction du myocarde. Des atteintes microvasculaires diffuses, précédant l'infarctus ou l'insuffisance cardiaque sont impliqués dans bon nombre de pathologies cardiaques. Ce travail vise à améliorer les techniques existantes de mesure quantitatives et non-invasive de la perfusion myocardique par marquage de spins artériels (ASL). La première partie de mon travail de thèse a consisté en la mise place chez la souris d'une technique alternative pour mesurer la perfusion myocardique. Celle-ci est basée sur un marquage pulsé et régulière
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17

Gibert, Guillaume. "Quantification of the Cerebral Perfusion with the Arterial Spin Labelling 3D-MRI method. Quantification of the Cerebral Perfusion with the Arterial Spin Labelling 3D-MRI method." Thesis, KTH, Skolan för teknik och hälsa (STH), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148020.

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The Arterial Spin Labelling (ASL) method is a Magnetic Resonance technique used toquantify the cerebral perfusion. It has the big advantage to be non-invasive so doesn’tneed the injection of any contrast agent. But due to a relatively low Signal-to-NoiseRatio (SNR) of the signal acquired (only approximately 1% of the image intensity), ithas been hampered to be widely used in a clinical setting so far.The primary objective of this project is to make the method more robust by improvingthe quality of the images, the SNR, and by reducing the acquisition time. DifferentASL protocols with different
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18

Jones, Craig K. "Quantitative multi-component T(2) analysis using fast spin-echo MRI." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq28592.pdf.

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19

Gill, Bradford A. "Multislice perfusion imaging with arterial spin labelling, applications to functional MRI." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ64361.pdf.

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20

Gill, Bradford A. "Multislice perfusion imaging with arterial spin labelling : applications to functional MRI." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30386.

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This thesis presents the design, implementation and testing of a perfusion-weighted magnetic resonance imaging sequence that is capable of acquiring several slices at a time. Various methods of image acquisition and perfusion contrast generation are considered and tested.<br>The results of multi-slice acquisitions are compared with those from single-slice sequences in a variety of experiments to elucidate the effects of various imaging parameters on the measured perfusion signal. A seven slice version was implemented, and was found to give good results in the tests performed. This sequence wil
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21

Parkes, Laura Michelle. "Measuring blood perfusion in the brain using arterial spin labelled MRI." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402080.

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22

Siow, Bernard, Ivana Drobnjak, Andrada Ianus, Isabel N. Christie, Mark F. Lythgoe, and Daniel C. Alexander. "Axon radius estimation with Oscillating Gradient Spin Echo (OGSE) diffusion MRI." Diffusion fundamentals 18 (2013) 1, S. 1-6, 2013. https://ul.qucosa.de/id/qucosa%3A13707.

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The estimation of axon radius provides insights into brain function [1] and could provide progression and classification biomarkers for a number of white matter diseases [2-4]. A recent in silico study [5] has shown that optimised gradient waveforms (GEN) and oscillating gradient waveform spin echo (OGSE) have increased sensitivity to small axon radius compared to pulsed gradient spin echo (PGSE) diffusion MR sequences. In a follow-up study [6], experiments with glass capillaries show the practical feasibility of GEN sequences and verify improved pore-size estimates. Here, we compare PGSE wit
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23

Ramasawmy, R. "Measurements of pre-clinical liver perfusion using arterial spin labelling MRI." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1470663/.

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Magnetic Resonance Imaging (MRI) has been at the focus of medical research as its availability and fidelity has improved in the last thirty years. MRI offers both high spatial resolution and excellent soft tissue contrast compared to complimentary medical imaging techniques, without the need to expose patients to ionising radiation. Novel MRI methods that utilise the intrinsic body water signal are still being developed and refined. Arterial Spin Labelling (ASL) MRI provides a non-invasive method to measure tissue perfusion, which has been extensively applied in the brain, and demonstrated pre
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24

Siow, Bernard, Ivana Drobnjak, Andrada Ianus, Isabel N. Christie, Mark F. Lythgoe, and Daniel C. Alexander. "Axon radius estimation with Oscillating Gradient Spin Echo (OGSE) diffusion MRI." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-184163.

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The estimation of axon radius provides insights into brain function [1] and could provide progression and classification biomarkers for a number of white matter diseases [2-4]. A recent in silico study [5] has shown that optimised gradient waveforms (GEN) and oscillating gradient waveform spin echo (OGSE) have increased sensitivity to small axon radius compared to pulsed gradient spin echo (PGSE) diffusion MR sequences. In a follow-up study [6], experiments with glass capillaries show the practical feasibility of GEN sequences and verify improved pore-size estimates. Here, we compare PGSE wit
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25

Malínský, Miloš. "Pokročilé algoritmy fúze 3D medicínských dat pro specifické lékařské problémy." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-233603.

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Fúze obrazu je dnes jednou z nejběžnějších avšak stále velmi diskutovanou oblastí v lékařském zobrazování a hraje důležitou roli ve všech oblastech lékařské péče jako je diagnóza, léčba a chirurgie. V této dizertační práci jsou představeny tři projekty, které jsou velmi úzce spojeny s oblastí fúze medicínských dat. První projekt pojednává o 3D CT subtrakční angiografii dolních končetin. V práci je využito kombinace kontrastních a nekontrastních dat pro získání kompletního cévního stromu. Druhý projekt se zabývá fúzí DTI a T1 váhovaných MRI dat mozku. Cílem tohoto projektu je zkombinovat stuktu
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26

Wiersma, Jonna Alcide. "Measurement of cerebral blood flow in humans using MRI with arterial spin labelling." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.483504.

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27

Whitaker, Chastity Diane Shaffer. "Evaluation of Hahn, CPMG, and combined spin echo analysis at 8 Tesla MRI." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092788422.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xxvi, 265 p. : ill. (some col.). Advisor: Petra Schmalbrock, Department of Radiology. Includes bibliographical references (p. 244-265).
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28

Pesaresi, Simone. "Analisi e controllo di qualità di immagini da OCRA TableTop MRI." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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OCRA Tabletop MRI è un setup di risonanza magnetica da tavolo usato a scopo didattico e di ricerca. Il sistema è composto da un magnete permanente da 0.28 T, 4 bobine di gradiente e una bobina a RF usata sia per trasmettere che per ricevere i segnali. I segnali sono elaborati da una scheda di acquisizione che comunica in rete i risultati delle scansioni. Il setup è abbastanza economico e versatile in quanto permette di personalizzare le sequenze di acquisizione e di modificarle in tempo reale. In questo contesto si è inserito il lavoro descritto in questo elaborato: una interfaccia grafica (
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29

Mitchell, Chad A. "Besign-directed measurements of B1 heterogeneity and spin-lattice relaxation for 8 Tesla MRI." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1095684374.

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30

Mitchell, Chad Alan. "Design-directed measurements of B1 heterogeneity and spin-lattice relaxation for 8 Tesla MRI." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1095684374.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xxx, 256 p.; also includes graphics. Includes bibliographical references (p. 186-193).
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31

Tomi-Tricot, Raphaël. "Clinical applications of the kT-points method to homogenise spin excitation in 3T MRI." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS260/document.

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L'imagerie par résonance magnétique (IRM) à haut champ offre un bénéfice certain en rapport signal-sur-bruit. De ce fait, les imageurs à 3T sont souvent utilisés en pratique clinique.Cependant, à haut champ, les images d'IRM sont entachées de pertes de signal et de contraste liées à la baisse de la longueur d’onde radiofréquence (RF) en deçà des dimensions de l'objet irradié. A 3T, où la longueur d'onde est de 30 cm environ dans les tissus humains, de tels artéfacts sont fréquents en imagerie abdominale, des seins ou encore des cuisses, ce qui peut expliquer la difficulté que rencontre l'IRM à
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32

Debacker, Clément. "Développement de l'imagerie de perfusion cérébrale par marquage des spins artériels." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY018/document.

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Ce travail de thèse, principalement méthodologique, s'est intéressé aux techniques d'imagerie par résonance magnétique (IRM) permettant de mesurer le flux sanguin cérébral (CBF) et plus particulièrement aux techniques de marquage de spins artériels (ASL), qui utilisent les protons de l'eau du sang comme marqueur. Nous avons mis en place la séquence ASL de marquage pseudo-continu (pCASL) et évalué sa réponse à un stimulus hypercapnique. Nous avons évalué différentes stratégies pour optimiser l'efficacité d'inversion. Pour cela, nous avons également mis en place des outils de simulations numériq
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33

Hirschler, Lydiane. "Developments in preclinical arterial spin labeling." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY014/document.

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Le flux sanguin cérébral (CBF) caractérise la micro-circulation et l'irrigation des tissus. Cette information de perfusion cérébrale est utilisé en clinique pour le diagnostic et le suivi thérapeutique de nombreuses maladies. La technique de mesure de CBF la moins invasive est celle par marquage de spins artériels (ASL) où l'eau du sang fait office de traceur. L'objectif de cette thèse, menée dans le cadre d'une convention CIFRE, consistait à faciliter l'utilisation de séquences ASL continues et pseudo-continues (CASL, pCASL) ainsi qu'à améliorer leur performance en pré-clinique. En effet, la
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34

Zhou, Xiangzhi. "An Analysis of NMRD profiles and ESR lineshapes of MRI Contrast Agents." Doctoral thesis, Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-361.

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35

Theilmann, Rebecca Jean. "High-resolution diffusion imaging with DIFRAD-FSE (diffusion-weighted radial acquisition with fast spin echo) MRI." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/284332.

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A novel MRI method, DIFRAD-FSE (D̲i̲f̲fusion with R̲adial A̲cquisition of D̲ata with F̲ast S̲pin-E̲cho) is presented that enables rapid, high-resolution, multi-shot diffusion-weighted MRI without significant artifacts due to motion. Following a diffusion-weighted spin-echo preparation, multiple radial lines of Fourier data are acquired using spin-echo refocusing. Data can be acquired in either 2D or 3D Fourier space. Motion correction is accomplished via one of four correction techniques: phase correction, shift correction, a combination of the phase and shift correction, or magnitude. Images
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36

Graafen, Dirk Markus [Verfasser]. "Parahydrogen induced polarization on a clinical MRI system : polarization transfer of two spin order / Dirk Markus Graafen." Mainz : Universitätsbibliothek Mainz, 2013. http://d-nb.info/1032940255/34.

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37

Maumet, Camille. "From group to patient-specific analysis of brain function in arterial spin labelling and BOLD functional MRI." Phd thesis, Université Rennes 1, 2013. http://tel.archives-ouvertes.fr/tel-00863908.

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This thesis deals with the analysis of brain function in Magnetic Resonance Imaging (MRI) using two sequences: BOLD functional MRI (fMRI) and Arterial Spin Labelling (ASL). In this context, group statistical analyses are of great importance in order to understand the general mechanisms underlying a pathology, but there is also an increasing interest towards patient-specific analyses that draw conclusions at the patient level. Both group and patient-specific analyses are studied in this thesis. We first introduce a group analysis in BOLD fMRI for the study of specific language impairment, a pat
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38

Birchall, Jonathan R. "Characterisation of Rb and Cs spin-exchange optical pumping for application to hyperpolarised 129Xe functional lung MRI." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/46779/.

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When performing nuclear magnetic resonance (NMR) it is desirable to maximise the available polarisation of the spin system in order to achieve optimal signal-to-noise ratios. One method of achieving this is via the process of spin-exchange optical pumping (SEOP). SEOP can be used to produce hyperpolarised (HP) noble gases, which possess numerous applications in the fields of science and medicine, ranging from spectroscopic imaging of porous media to Magnetic Resonance Imaging (MRI) of the human lungs. The SEOP process involves transfer of angular momentum from circularly polarised laser photon
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39

Joseph, Arun Antony [Verfasser], Peter Gutachter] Jakob, and Jens [Gutachter] [Frahm. "Real-time MRI of Moving Spins Using Undersampled Radial FLASH / Arun Antony Joseph. Gutachter: Peter Jakob ; Jens Frahm." Würzburg : Universität Würzburg, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-94000.

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40

Joseph, Arun Antony Verfasser], Peter [Gutachter] Jakob, and Jens [Gutachter] [Frahm. "Real-time MRI of Moving Spins Using Undersampled Radial FLASH / Arun Antony Joseph. Gutachter: Peter Jakob ; Jens Frahm." Würzburg : Universität Würzburg, 2013. http://d-nb.info/1111886806/34.

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41

Barizon, Gustavo Canavaci. "Métodos de análise de imagens aplicados à caracterização tecidual, perfusão miocárdica e inervação autonômica em MRI e SPECT no contexto da doença de Chagas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-25062015-140404/.

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A doença de Chagas possui uma importante relevância clínica, sendo uma das principais causas de mortalidade e morbidade na América Latina. As relações entre a lesão tecidual miocárdica e os defeitos na inervação autonômica na doença de Chagas são pouco conhecidas. Este trabalho descreve o desenvolvimento e aplicação de métodos de segmentação, corregistro e análise de imagens capazes de prover uma análise integrada das lesões teciduais através do imageamento de ressonância magnética (MRI), perfusão miocárdica e inervação autonômica, disponíveis através da tomografia de emissão de fótons (SPECT)
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42

Ueda, Hiroyuki. "Studies on low-field functional MRI to detect tiny neural magnetic fields." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263666.

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付記する学位プログラム名: 京都大学卓越大学院プログラム「先端光・電子デバイス創成学」<br>京都大学<br>新制・課程博士<br>博士(工学)<br>甲第23205号<br>工博第4849号<br>京都大学大学院工学研究科電気工学専攻<br>(主査)教授 小林 哲生, 教授 松尾 哲司, 特定教授 中村 武恒<br>学位規則第4条第1項該当<br>Doctor of Philosophy (Engineering)<br>Kyoto University<br>DFAM
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Six, Joseph. "New MRI contrast agents through spin exchange optical pumping of noble gases with a nuclear electric quadrupole moment." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14118/.

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Hyperpolarized 83Kr has previously demonstrated MRI contrast that is sensitive to the chemical composition of the surface in a porous model system. One-dimensional nuclear magnetic resonance spectroscopy of hyperpolarized 83Kr has also revealed distinctive longitudinal relaxation times from selected regions of an ex vivo rat lung originating from differences in surface to volume ratio. However, at the time, MRI using longitudinal relaxation for contrast was not attempted due to limited signal intensities. Methodological advances of the spin exchange optical pumping process have led to a substa
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44

GIACOMINI, THEA. "High density EEG and arterial spin labelling MRI perfusion in the diagnosis and follow-up of patients with Moyamoya vasculopathies." Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1083396.

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Introduction: Moyamoya vasculopathy is a rare condition characterized by “puff of smoke” angiographic appearance. The natural history includes recurrent transient ischemic attacks, ischemic stroke or intracerebral bleeding. Pharmacological treatment is not effective in preventing these clinical events and patients may benefit from surgical revascularization, but the timing of surgery is still controversial, especially at the early stages of the disease. Although angiography is still the gold standard for diagnosis and evaluation of patients with moyamoya, it has several limitations because of
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45

Bačovský, Jaromír. "Zvýraznění kontrastu pro rozlišení tkání a detekci kontrastních nanočástic metodami magnetickorezonančního zobrazování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230830.

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Magnetic resonance imaging is a routine and powerful diagnostic technique capable of providing detailed information about the structure and composition of the tissues. This diploma thesis is concerned with the mechanisms of contrast origin and contrast modifications by molecular and nanoparticle contrast agents. First sections of the thesis summarize basic knowledge about pulse sequences and it aims to provide an overview on MRI contrast agent with a special emphasis on paramagnetic gadolinium contrast agents and superparamagnetic nanoparticles. The main purpose of this study is to develop the
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Muenkel, Jessica. "An Evaluation of the Dose to the Spinal Cord for SBRT Spine Patients and the Role of MRIs." University of Toledo Health Science Campus / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=mco1493393442668266.

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47

Treffel, Loïc. "Dysfonctions vertébrales et posturales après simulations de la microgravité." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAJ111/document.

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Ce travail de thèse a pour but l’étude des douleurs de dos qui surviennent chez l’astronaute présentant davantage de hernies discales par rapport à une population contrôle. Nos recherches visent à comprendre la physiopathologie de ce phénomène et à étudier les conséquences cliniques de ce déconditionnement vertébral qui participe également aux troubles posturaux. Cet axe de recherche est recommandé par les différentes agences spatiales internationales. Pour cela nous avons eu l’opportunité d’analyser les données dans deux modèles d’études des effets de la microgravité : l’immersion sèche (n=11
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48

Thompson, William Kevin. "T2 Mapping of Muscle Activation During Single-Leg Vertical Jumping Exercise." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1194982561.

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49

Wang, Jinping. "Design, Synthesis and Characterization of Ferrous Complexes Displaying Electroneutrality." Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL0989/document.

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Le magnétisme est une propriété physique et intrinsèque de la matière, les matériaux paramagnétiques peut être utilisé pour la recherche chimique et biologique. Le changement du magnétisme d'une molécule qui peut être détectée par RMN ou ESR IRM représente un changement des conditions environnementales causées par certains analytes. Ainsi, elle est une alternative de méthodes typiques basées sur les propriétés optiques et elle attire les grands intérêts pour la recherche. La première partie introduit le magnétisme de la matière et l'IRM comme un outil indispensable dans le diagnostic modernes
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Krchňavý, Jan. "Akvizice a předzpracování MRI obrazových sekvencí pro klinické perfusní zobrazování." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219512.

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This thesis describes the theory for static and dynamic magnetic-resonance imaging using contrast agents affecting T1 relaxation time. The available acquisition methods in the specified facility of Masaryk Oncological Institute in Brno are described. The sequences for subsequent experimental measurements are selected. The used phantoms are described. Acquisition protocol for measuring is described briefly and the evaluation method for the measured data is suggested. The best acquisition sequence and a method of measurements is chosen influenced by estimation of relaxation time T1, sensitivity
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