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Relevant bibliographies by topics / High Field MRI / Dissertations / Theses

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Dissertations / Theses on the topic 'High Field MRI'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 March 2023

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1

Jiang, Lei. "Developments in High Field MRI." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491630.

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The technique of magnetic resonance imaging (MRI) is widely used in both structural and functional imaging. This thesis explores some important developments and applications in high field MRI. The work in this thesis has been undertaken by the author except where indicated by reference. Initially, a purpose-built dynamic functional phantom was devised and used for quality control and testing imaging pulse sequences. A multi-echo GEBPI sequence was assessed and the most efficient ways to combine multiecho data taking account of the effect of bandwidth were explored by using this phantom. Subseq

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2

Sulikowska, Aleksandra. "Motion correction in high-field MRI." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33674/.

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The work described in this thesis was conducted at the University of Nottingham in the Sir Peter Mansfield Imaging Centre, between September 2011 and 2014. Subject motion in high- resolution magnetic resonance imaging (MRI) is a major source of image artefacts. It is a very complex problem, due to variety of physical motion types, imaging techniques, or k-space trajectories. Many techniques have been proposed over the years to correct images for motion, all looking for the best practical solution in clinical scanning, which would give cost- effective, robust and high accuracy correction, witho

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3

Mougin, Olivier. "Quantitative methods in high field MRI." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11608/.

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The increased signal-to-noise ratio available at high magnetic ﬁeld makes possible the acquisition of clinically useful MR images either at higher resolution or for quantitative methods. The work in this thesis is focused on the development of quantitative imaging methods used to overcome difﬁculties due to high ﬁeld MRI systems (> 3T). The protocols developed and presented here have been tested on various studies aiming at discriminating tissues based on their NMR properties. The quantities of interest in this thesis are the longitudinal relaxation time T1, as well as the magnetization transf

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4

Wharton, Samuel James. "Susceptibility mapping in high field MRI." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/13074/.

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Phase images of the human brain acquired using gradient echo based Magnetic Resonance Imaging techniques show excellent contrast at 7T. This contrast is attributed to small variations in magnetic susceptibility that perturb the main magnetic field and thus yield a spatial variation of the NMR frequency. The work described in this thesis is primarily concerned with mapping the distribution of magnetic susceptibility within the human brain using these phase images. The main technical challenges of the project were first to extract accurate field maps based on phase data, and then to solve the il

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5

Anderson, Christian Edwin. "High-Field Magnetic Resonance Fingerprinting for Molecular MRI." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case152478492457623.

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6

Gerardin, Emilie. "Morphometry of the human hippocampus from MRI and conventional MRI high field." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00856589.

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The hippocampus is a gray matter structure in the temporal lobe that plays a key role in memory processes and in many diseases (Alzheimer's disease, epilepsy, depression ...).The development of morphometric models is essential for the study of the functional anatomy and structure alterations associated with different pathologies. The objective of this thesis is to develop and validate methods for morphometry of the hippocampus in two contexts: the study of the external shape of the hippocampus from conventional MRI (1.5T or 3T) with millimeter resolution, and the study of its internal structur

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7

Jones, Alexa. "Radio frequency coils for ultra-high field MRI." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490979.

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The push toward higher magnetic fields in MRI has consistently thrown up new challenges in hardware development. The recent development of a new generation of ultra-high field scanners for human imaging is no exception. The earch presented in this thesis aims to provide solutions to new technical challenges in radio-frequency probe design. All probe designs were developed for use at 7T on a Philips Acheiva full body scanner.

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8

Farhat, Sedig. "Radiofrequency coils for ultra-high field body MRI." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/28847/.

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In this thesis, the probes were modelled and constructed at the SPMMRC. All measurements were performed on a 7T Philips scanner. The coils have been successfully evaluated. The dipole, loops, strip line and wrist probes for imaging the pelvis, knee and wrist were tested for clinical use at 7T. Two elements wrist coil can pick up signals from the whole region of interest. The advantage is more uniformity of field of view and better sensitivity. The in vivo MRI images acquired in the wrist showed the two elements provided the good quality images for the human wrist. The second study is microstri

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9

De, Vita Enrico. "Development and optimisation of high-field MRI techniques." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408802.

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10

Shah, Simon Michael. "Magnetisation transfer effects at ultra high field MRI." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39398/.

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Increased signal to noise ratio in ultra high field Magnetic Resonance Imaging (MRI) has allowed the development of quantitative imaging techniques and new contrast mechanisms, such as Chemical Exchange Saturation Transfer (CEST) to be probed. The development of CEST contrast imaging has involved overcoming a number of technical challenges associated with ultra high field MRI. The B1 transmit field was, and still is, a major challenge. Presented in this thesis, the B1 transmit field in regions of low B1 are improved with the use of dielectric pads and a simulation study shows that the overall

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11

Chen, Xin. "Analytical Path to Improved RF Field Homogeneity for High Field MRI." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1237482374.

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12

Case, Russell. "REDUCING EDDY CURRENTS IN HIGH MAGNETIC FIELD ENVIRONMENTS." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4305.

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When an electrical conducting volume is placed into the bore of an MRI undergoing an image scan, time varying magnetic gradients induce eddy currents in this conducting material. These eddy currents in turn produce a mechanical torque on this volume. It is the goal of this thesis to produce a computer simulation of eddy currents produced by placing conducting materials inside an MRI bore. The first part of the thesis establishes the physics and principles behind an MRI system along with several applications. Next, this thesis presents an analysis of eddy current effects produced on a conductor

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13

Manivannan, Niranchana. "Super Resolution in Ultra High Field MRI - A Comparison." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1293632071.

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14

Abualait, Turki S. Sabrah. "Investigating basal ganglia function using ultra-high field MRI." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/32366/.

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The basal ganglia (BG) are a group of highly interconnected nuclei that are located deep at the base of the cerebral cortex. They participate in multiple neural circuits or 'loops' with cognitive and motor areas of the cerebral cortex. The basal ganglia has primarily been thought to be involved in motor control and learning, but more recently a number of brain imaging studies have shown that the basal ganglia are involved also in cognitive function. The aim of this work is to investigate the role of the basal ganglia in cognitive control and motor learning by examining its involvement in GO/WA

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15

Dixon, Jennifer Elizabeth. "Optimisation of high-field MRI for investigation of multiple sclerosis." Thesis, University of Nottingham, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523042.

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16

Kopechek, Jonathan A. "Monte Carlo simulations of magnetic field perturbers in ultra-high field MRI using supercomputers." Connect to resource, 2006. http://hdl.handle.net/1811/6470.

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Thesis (Honors)--Ohio State University, 2006.<br>Title from first page of PDF file. Document formatted into pages: contains 94 p.; also includes graphics. Includes bibliographical references (p. 93-94) Available online via Ohio State University's Knowledge Bank.

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17

Liang, Jiachao. "Dynamic Contrast Enhanced Magnetic Resonance Imaging at High and Ultra-high Fields." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228327344.

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18

Cheong, Hoon Sin. "Cryogenically-cooled high temperature superconducting (HTS) coils for low field MRI." Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575382.

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In low field MRl (<0.5T), the signal-to-noise ratio (SNR) is predominantly degraded by thermal noise of the imaging coil when the sample loading is minimized. This means surface coils made of high temperature superconductors (HTS) should have an SNR significantly higher than their room-temperature copper equivalents due to the reduction in resistivities. While this hypothesis has been reportedly validated, the actual efficacy of HTS coils is still debatable as the benchmark setups in the prior art had an unfavorably large coil-to-sample separation which diminished the SNR yield. This thesis is

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19

Kolment, Nadine. "Towards High-Field MRI Systems: Design Strategy for the TEM Resonator." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121211.

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High-field magnetic resonance imaging (MRI) is a very promising concept as it benefits from a significant improvement in the signal-to-noise ratio (SNR), a measure that directly affects image resolution. However, as the resonant wavelength approaches the dimensions of the object being imaged, the wave propagation effects of the radio frequency (RF) field significantly deteriorate the uniformity of the excitation pattern, thus leading to contrast aberrations and distortions in the resulting image. Recent proof-of-concept studies have shown the merits of parallel transmission techniques in accur

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20

Poole, Michael Stephen. "Improved equipment and techniques for dynamic shimming in high field MRI." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445686.

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21

von, Morze Cornelius Jan. "Hardware and software developments for high field (≥ 3T) phased array MRI." Diss., Search in ProQuest Dissertations & Theses. UC Only, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3297779.

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Thesis (Ph.D.)--University of California, San Francisco with the University of California, Berkeley, 2008.<br>Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1770. Adviser: Daniel B. Vigneron.

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22

Schwarz, Jolanda M. [Verfasser]. "Advanced Image Reconstruction Methods for Ultra-High Field MRI / Jolanda M. Schwarz." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1218474947/34.

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23

Vaidya, Manushka. "Steering Electromagnetic Fields in MRI| Investigating Radiofrequency Field Interactions with Endogenous and External Dielectric Materials for Improved Coil Performance at High Field." Thesis, New York University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10261392.

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<p> Although 1.5 and 3 Tesla (T) magnetic resonance (MR) systems remain the clinical standard, the number of 7 T MR systems has increased over the past decade because of the promise of higher signal-to-noise ratio (SNR), which can translate to images with higher resolution, improved image quality and faster acquisition times. However, there are a number of technical challenges that have prevented exploiting the full potential of ultra-high field (≥ 7 T) MR imaging (MRI), such as the inhomogeneous distribution of the radiofrequency (RF) electromagnetic field and specific energy absorption ra

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24

Taracila, Victor. "HIGH-FIELD MRI ISSUES: FINITE WAVELENGTH EFFECTS, TRANSVERSE COIL DESIGN AND ACOUSTIC NOISE REDUCTION." online version, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1151698057.

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25

Wang, Chunsheng. "Numerical study of RF magnetic field, specific absorption rate and signal to noise ratio in high field MRI." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36887560.

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26

Wang, Chunsheng, and 汪春生. "Numerical study of RF magnetic field, specific absorption rate and signal to noise ratio in high field MRI." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36887560.

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27

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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28

Kearney, H. "Investigation of multiple sclerosis spinal cord using high field MRI with multi-transmit technology." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1452991/.

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This thesis explores abnormalities in the multiple sclerosis (MS) spinal cord and their relationship with physical disability through the use of conventional and quantitative magnetic resonance imaging (MRI). Firstly, an hypothesis was tested that spinal cord atrophy would be associated with disability, independently from brain atrophy and lesion load, in long disease duration MS. The results presented confirm that cord atrophy is significantly associated with higher levels of physical disability after more than twenty years of MS. Following this observation, the next experiment investigated w

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29

Jayatilake, Mohan L. "Optimization and construction of passive shim coils for human brain at high field MRI." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313772791.

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30

Fatahi, Mahsa [Verfasser]. "Ultra-high field MRI bio-effects and safety assessment : a multidisciplinary approach / Mahsa Fatahi." Magdeburg : Universitätsbibliothek, 2017. http://d-nb.info/1139048465/34.

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31

Burgess, Richard Ely. "Magnetic resonance imaging at ultra high field implications for human neuroimaging /." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1089949841.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xiv, 222 p. : ill. (some col.). Advisor: Pierre-Marie Luc Robitaille, Dept. of Emergency Medicine. Includes bibliographical references.

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32

Ripoli, Cristina. "Low and high field Magnetic Resonance Imaging and its application in food science and plants." Doctoral thesis, Universita degli studi di Salerno, 2018. http://elea.unisa.it:8080/xmlui/handle/10556/4385.

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2016 - 2017<br>Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI) are techniques that have seen a remarkable success and a fast growth over the past decades. Thanks to its non-invasivity and non-descrutivity, the MRI enhances its potential to perform inspections and studies of the internal structure of intact samples such as fruits and vegetables. without modifications caused by the measurements Due to the presence of a high water content in these products, MRI can be useful to obtain information about tissue properties and, thanks to the high sensitivity, can trace water

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33

MORE, SHASHIKANT R. "EXPERIMENTAL CHARACTERIZATION AND ACTIVE CONTROL SIMULATION OF THE ACOUSTIC NOISE RESPONSE OF A HIGH-FIELD, HIGH RATE MRI SCANNER." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100536748.

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34

von, Smuda Steffen. "Applicability of Quantitative Functional MRI Techniques for Studies of Brain Function at Ultra-High Magnetic Field." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-161683.

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This thesis describes the development, implementation and application of various quantitative functional magnetic resonance imaging (fMRI) approaches at ultra-high magnetic field including the assessment with regards to applicability and reproducibility. Functional MRI (fMRI) commonly uses the blood oxygenation level dependent (BOLD) contrast to detect functionally induced changes in the oxy-deoxyhaemoglobin composition of blood which reflect cerebral neural activity. As these blood oxygenation changes do not only occur at the activation site but also downstream in the draining veins, the spat

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35

von, Smuda Steffen. "Applicability of Quantitative Functional MRI Techniques for Studies of Brain Function at Ultra-High Magnetic Field." Doctoral thesis, Max-Plank Institut für Kognitions- und Neurowissenschaften, 2014. https://ul.qucosa.de/id/qucosa%3A13196.

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This thesis describes the development, implementation and application of various quantitative functional magnetic resonance imaging (fMRI) approaches at ultra-high magnetic field including the assessment with regards to applicability and reproducibility. Functional MRI (fMRI) commonly uses the blood oxygenation level dependent (BOLD) contrast to detect functionally induced changes in the oxy-deoxyhaemoglobin composition of blood which reflect cerebral neural activity. As these blood oxygenation changes do not only occur at the activation site but also downstream in the draining veins, the spat

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36

Finnegan, Mary E. "Investigation of the relationship between iron and high field MRI in healthy and Alzheimer's disease tissue." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/60293/.

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It has been proposed that increased tissue iron concentration, which has been observed in certain regions of the brain in individuals with Alzheimer’s Disease (AD), could provide a marker for diagnosis through detection with MRI. This is investigated in this thesis using high field MRI to examine post mortem human brain tissue. It is shown here that by using data from multiple brain regions discriminant analysis can successfully differentiate between AD and control samples, even when no statistically significant differences are observed in individual brain regions. A unique set of complementar

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37

Leroi, Lisa. "Quantitative MRI : towards fast and reliable T₁, T₂ and proton density mapping at ultra-high field." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS429/document.

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L’IRM quantitative recouvre l’ensemble des méthodes permettant de mesurer des paramètres physiques accessibles en Résonance Magnétique Nucléaire. Elle offre un bénéfice par rapport à l’imagerie en pondération classiquement utilisée, notamment pour la détection, la caractérisation physiopathologique mais aussi pour le suivi thérapeutique des pathologies. Malgré ce potentiel avéré connu de longue date, ces méthodes restent peu utilisées dans la routine clinique. La raison principale est la longueur des acquisitions par rapport à l’approche classique. Les paramètres physiques que nous souhaitons

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38

Chang, Yu-Chun [Verfasser], and Anke [Akademischer Betreuer] Henning. "Real-time Feedback of B0 Shimming at Ultra High Field MRI / Yu-Chun Chang ; Betreuer: Anke Henning." Tübingen : Universitätsbibliothek Tübingen, 2018. http://d-nb.info/116880390X/34.

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39

Fiege, Daniel Pascal [Verfasser]. "Development and application of multiple-quantum coherence techniques for in vivo sodium MRI at high and ultra-high field strengths / Daniel Pascal Fiege." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1052254756/34.

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40

Fuhrer, Erwin [Verfasser], and J. G. [Akademischer Betreuer] Korvink. "Advanced interfaces for biomedical engineering applications in high- and low field NMR/MRI / Erwin Fuhrer ; Betreuer: J. G. Korvink." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1195049161/34.

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41

He, Yi [Verfasser], and Xin [Akademischer Betreuer] Yu. "High-Field Functional MRI from the Perspective of Single Vessels in Rats and Humans / Yi He ; Betreuer: Xin Yu." Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/1210484307/34.

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42

Al, Mohamad Zakriya Ali E. "Quantitative assessment of the biochemical composition of equine cartilage using 7T ultra-high field magnetic resonance imaging (MRI) techniques." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/8227/.

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Equine fetlock region disease is responsible for significant morbidity and mortality. Diagnosis of sesamoidean ligament, cartilage and subchondral bone injury has been obtained by clinical MRI. Low-field MRI provides images helpful in the investigation of MCPJ/MTPJ region pathology in horses in the clinical setting but the greater resolution of high and ultra-field MR images has the potential to aid interpretation through a better understanding of MRI anatomy. Quantitative MRI could provide a non-invasive technique to determine tissue biochemical properties associated with the early onset of a

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43

Tadesse, Yonatan Abebe. "The Electromagnetic Simulation of Birdcage Coils for MRI based on Finite Element Method." Youngstown State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1484137190762487.

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44

Geng, Jianzhao. "Flux pumping for high-Tc superconducting (HTS) magnets." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/268221.

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High Tc superconductors are enabling in the generation of extremely high magnetic fields. Flux pumping is a promising technology which can be used to operate HTS magnets without significant loss. In this decade, several HTS flux pumps based on travelling magnetic waves have been developed, yet their physics is still unclear. This thesis established a framework in the area of flux pumping for HTS coils. It revealed the underlying physics of existing travelling wave flux pumps, which is an important theoretical contribution. Based on the thorough understanding of flux pumping mechanism, the auth

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MILESI, GLORIA. "Temporal lobe epilepsy: a combined study with high field (7T) Magnetic Resonance Imaging and optical and ultrastructural histopathology." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/80943.

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Temporal lobe epilepsy (TLE) is the most common form of focal epilepsy with 60-75% of cases reported in surgical series. The hippocampus is involved in the genesis of the seizures and hippocampal sclerosis (HS) is the most frequent neuropathological finding observed in surgical samples. However extra-hippocampal neocortical structures may also be involved and the focal cortical dysplasia (FCD) is the most common second alteration frequently associated with HS. Aim of this project was to clarify, both at radiological and neuropathological level, the abnormalities frequently observed in the tem

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Spicher, Nicolai [Verfasser], and Mark E. [Akademischer Betreuer] Ladd. "Time-frequency analysis of optical and electrical cardiac signals with applications in ultra-high-field MRI / Nicolai Spicher ; Betreuer: Mark E. Ladd." Duisburg, 2020. http://d-nb.info/1221061801/34.

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Ha, Yonghyun [Verfasser], N. Jon [Akademischer Betreuer] Shah, Dirk [Akademischer Betreuer] Heberling, and Joachim [Akademischer Betreuer] Mayer. "Development of novel RF coils for $^23}$Na imaging at ultra-high field MRI / Yonghyun Ha ; Nadim Joni Shah, Dirk Heberling, Joachim Mayer." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1213993873/34.

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Ha, Yonghyun Verfasser], N. Jon [Akademischer Betreuer] [Shah, Dirk [Akademischer Betreuer] Heberling, and Joachim [Akademischer Betreuer] Mayer. "Development of novel RF coils for $^23}$Na imaging at ultra-high field MRI / Yonghyun Ha ; Nadim Joni Shah, Dirk Heberling, Joachim Mayer." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1213993873/34.

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49

Huang, Fangping. "Water and Fat Image Reconstruction in Magnetic Resonance Imaging." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1309791802.

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Sharma, Puneet. "Comparison of Delayed Contrast-Enhanced Magnetic Resonance Imaging of Myocardial Viability at 1.5 and 3 Tesla." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6911.

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Imaging of myocardial viability using the delayed enhancement technique currently provides high image contrast between infarcted and normal tissue with the aid of a magnetization prepared fast gradient echo pulse sequence following the administration of an extracellular contrast agent. However, there exists a degree of image contrast variability and subjectivity due to contrast agent kinetics and user-specified imaging parameters. Also, the technique has not been explored at higher field strengths (3T), which offer greater inherent signal-to-noise ratio. The overall goal of this study is to co

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