Дисертації з теми "Magnetic Resonance I"
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Manners, David Neil. "Magnetic resonance imaging and magnetic resonance spectroscopy of skeletal muscle." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269250.
Повний текст джерелаMA, DAN. "Magnetic Resonance Fingerprinting." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1426170542.
Повний текст джерелаLu, Wenmiao. "Off-resonance correction in magnetic resonance imaging /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаLei, Hao. "Magnetic resonance perfusion imaging and double quantum coherence transfer magnetic resonance spectroscopy." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0021/NQ45007.pdf.
Повний текст джерелаNorwood, Timothy John. "Nuclear magnetic resonance in inhomogeneous magnetic fields." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24875.
Повний текст джерелаScience, Faculty of
Chemistry, Department of
Graduate
Petropoulos, Labros Spiridon. "Magnetic field issues in magnetic resonance imaging." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060710667.
Повний текст джерелаCook, M. I. "Magnetic resonance in solids." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253004.
Повний текст джерелаO'Connell, Andrew John. "Magnetic resonance in solids." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305439.
Повний текст джерелаLee, Kuan Jin. "Fast magnetic resonance imaging." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397487.
Повний текст джерелаSklar, Howard Fred. "Nuclear magnetic resonance logging." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10503.
Повний текст джерелаIncludes bibliographical references (leaves 119-121).
by Howard Fred Sklar.
M.S.
Tang, Xiao-wu 1972. "Nuclear magnetic resonance microscopy." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9542.
Повний текст джерелаIncludes bibliographical references (leaves 96-100).
This thesis describes the design and applications of an improved Nuclear Magnetic Resonance (NMR) microscope, which permits MRI to study small sample sizes ( < 2mm) at high resolution (up to 2[mu]m). The effects of molecular diffusion and local variations in the magnetic susceptibility in NMR microscopy are described, which, along with the intrinsic low sensitivity of NMR, are the fundamental limitations to resolution. Molecular diffusion in the presence of a magnetization grating not only broadens the point spread function but also reduces the signal intensity. The significance of these effects depends strongly on the magnetic field gradient strengths and imaging protocols. A NMR microscope for a standard bore 14.lT magnet was developed, it is equipped with a highly efficient. solenoidal RF coil and three orthogonal gradients with strengths of 1260G / cm for Gz , 760G/cm for Gy , and 410G/cm for Gx at 15A. A modified CTI sequence is presented which incorporates strong pulsed gradients, Ernst angle excitation, CP coherent detection and reduced k-space sampling. It is the optimal pulse sequence for acquiring high-resolution ( < 5[mu]m) NMR images (best signal-to-noise ratio per unit time) when the effect of molecular diffusion is significant. It is demonstrated that this new sequence makes it possible to acquire images with a high resolution of 2[mu]m x 2[mu]m x 8[mu]m within a few hours. A wide variety of images have been acquired using the new microscope, and representative images are presented to demonstrate the potential of NMR microscopy as a new tool in developmental biology research. In particular, used in combination with other biological techniques, NMR microscopy can provide a robust, non-invasive, 3D imaging approach to quantifying changes in structure due for instance to radiative exposure, therapy, and natural growth or genetic modifications.
by Xiao-wu Tang.
Ph.D.
O'Neil, Shannon M. "Magnetic resonance imaging centers /." Online version of thesis, 1994. http://hdl.handle.net/1850/11916.
Повний текст джерелаMeier, Benno. "Nuclear Magnetic Resonance in pulsed high magnetic fields." Doctoral thesis, Universitätsbibliothek Leipzig, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-101205.
Повний текст джерелаKim, Jongjoo. "Localized Ferromagnetic Resonance using Magnetic Resonance Force Microscopy." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222191966.
Повний текст джерелаBriand, Jacques. "Spatially localized nuclear magnetic resonance." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29062.
Повний текст джерелаScience, Faculty of
Chemistry, Department of
Graduate
Estilaei, Mohammadreza. "Proton magnetic resonance of lung." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0029/NQ27138.pdf.
Повний текст джерелаBergman, Harris L. "Knowledge-based magnetic resonance angiography." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18247.
Повний текст джерелаCampbell, Jennifer 1975. "Magnetic resonance diffusion tensor imaging." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30809.
Повний текст джерелаThis thesis describes the design and implementation of diffusion tensor imaging on a clinical MRI system. An acquisition sequence was designed and post-processing software developed to create diffusion trace images, scalar anisotropy maps, and anisotropy vector maps. A number of practical imaging problems were addressed and solved, including optimization of sequence parameters, accounting for flow effects, and dealing with eddy currents, patient motion, and ghosting. Experimental validation of the sequence was performed by calculating the trace of the diffusion tensor measured in various isotropic liquids. The results agreed very well with the quantitative values found in the literature, and the scalar anisotropy index was also found to be correct in isotropic phantoms. Anisotropy maps, showing the preferred direction of diffusion, were generated in human brain in vivo. These showed the expected white matter tracts in the corpus callosum.
Dick, Elizabeth Ann. "Magnetic resonance guided tumour ablation." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404556.
Повний текст джерелаCox, A. "Magnetic resonance measurements on diamond." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358599.
Повний текст джерелаBatchelor, Stephen Norman. "Reaction yield detected magnetic resonance." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334884.
Повний текст джерелаNewton, M. E. "Magnetic resonance measurements in diamonds." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253424.
Повний текст джерелаTronconi, Alvaro Luiz. "Magnetic resonance in crystalline solids." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329981.
Повний текст джерелаBroadhurst, R. William. "Flash photolysis nuclear magnetic resonance." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257654.
Повний текст джерелаJardine, V. L. "Minimal preparation magnetic resonance colonography." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.605059.
Повний текст джерелаLindsay, Alistair. "Magnetic resonance imaging of atherosclerosis." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526491.
Повний текст джерелаMcGarry, Matthew. "Rayleigh Damped Magnetic Resonance Elastograpy." Thesis, University of Canterbury. Mechanical Engineering, 2008. http://hdl.handle.net/10092/1918.
Повний текст джерелаAlwesh, Nawar S. "Superresolution of magnetic resonance images." Thesis, University of Canterbury. Electrical and Electronic Engineering, 2000. http://hdl.handle.net/10092/6882.
Повний текст джерелаGlover, Paul Martin. "High field magnetic resonance imaging." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335575.
Повний текст джерелаYoo, Seung-Schik 1970. "Adaptive functional magnetic resonance imaging." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/70893.
Повний текст джерелаSome research performed with the Harvard-M.I.T. Division of Health Sciences and Technology.
Includes bibliographical references (leaves 132-140).
Functional MRI (fMRI) detects the signal associated with neuronal activation, and has been widely used to map brain functions. Locations of neuronal activation are localized and distributed throughout the brain, however, conventional encoding methods based on k-space acquisition have limited spatial selectivity. To improve it, we propose an adaptive fMRI method using non-Fourier, spatially selective RF encoding. This method follows a strategy of zooming into the locations of activation by progressively eliminating the regions that do not show any apparent activation. In this thesis, the conceptual design and implementation of adaptive fMRI are pursued under the hypothesis that the method may provide a more efficient means to localize functional activities with increased spatial or temporal resolution. The difference between functional detection and mapping is defined, and the multi- resolution approach for functional detection is examined using theoretical models simulating variations in both in-plane and through-plane resolution. We justify the multi-resolution approach experimentally using BOLD CNR as a quantitative measure and compare results to those obtained using theoretical models. We conclude that there is an optimal spatial resolution to obtain maximum detection; when the resolution matches the size of the functional activation. We demonstrated on a conventional 1.5-Tesla system that RF encoding provides a simple means for monitoring irregularly distributed slices throughout the brain without encoding the whole volume. We also show the potential for increased signal-to-noise ratio with Hadamard encoding as well as reduction of the in-flow effect with unique design of excitation pulses.
(cont.) RF encoding was further applied in the implementation of real-time adaptive fMRI method, where we can zoom into the user-defined regions interactively. In order to do so, real-time pulse prescription and data processing capabilities were combined with RF encoding. Our specific implementation consisted of five scan stages tailored to identify the volume of interest, and to increase temporal resolution (from 7.2 to 3.2 seconds) and spatial resolution (from 10 mm to 2.5-mm slice thickness). We successfully demonstrated the principle of the multi- resolution adaptive fMRI method in volunteers performing simple sensorimotor paradigms for simultaneous activation of primary motor as well as cerebellar areas.
by Seung-Schik Yoo.
Ph.D.
Ling, Yibo. "Nuclear magnetic resonance readable sensors." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/57705.
Повний текст джерелаPage 104 blank. Cataloged from PDF version of thesis.
Includes bibliographical references.
The monitoring of physiological biomarkers is fundamental to the diagnosis and treatment of disease. We describe here the development of molecular sensors which can be read by magnetic resonance (MR) relaxometry. MR is an advantageous bio-sensor readout because it can be determined from opaque samples and through intervening layers of matter. Wash steps can therefore be avoided in in vitro MR assays and non-invasive interrogation achieved for in vivo MR sensing. Functionalized magnetic nanoparticles originally developed as in vivo contrast agents have recently been adapted for use in magnetic relaxometry assays. The first half of this thesis describes a simple particle functionalization strategy and its application to the detection of myocardial infarction ("heart attack") associated biomarkers. The particles were subcutaneously implanted in the form of small discrete sensors and shown to be efficacious in measuring the physiological release of three protein biomarkers. Alternative contrast mechanisms may also be employed by MR readable sensors. The second half of this thesis introduces the novel use of 'smart' polymers which produce analyte-responsive changes in MR relaxivity. We show that MR responsive calcium-crosslinked and pH-swelling hydrogels can be incorporated within discrete sensors.
by Yibo Ling.
Ph.D.
Eichner, Cornelius. "Slice-Accelerated Magnetic Resonance Imaging." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-184944.
Повний текст джерелаHarvey, Peter. "Paramagnetic probes for magnetic resonance." Thesis, Durham University, 2013. http://etheses.dur.ac.uk/7011/.
Повний текст джерелаMorton, Geraint. "Cardiovascular magnetic resonance guided revascularisation." Thesis, King's College London (University of London), 2012. https://kclpure.kcl.ac.uk/portal/en/theses/cardiovascular-magnetic-resonance-guided-revascularisation(3dd5c5fe-c3a9-4287-a2e5-d2c9da4e8e27).html.
Повний текст джерелаMiranda, João Pedro Ribeiro. "Functional studies on magnetic resonance." Master's thesis, Faculdade de Ciências e Tecnologia, 2010. http://hdl.handle.net/10362/4941.
Повний текст джерелаBackground: Magnetic Resonance Imaging (MRI) is an imaging technique used primarily to produce high quality structural and functional images of the human body. Functional MRI techniques, among which are included the Arterial Spin Labeling (ASL) and the Blood Oxygenation Level-Dependent (BOLD), are used to measure brain activity. Several studies have shown that ASL holds several advantages when compared with BOLD, namely the fact of being more reproducible and perfusion quantitative. Purpose: The main aim of this work is to obtain perfusion quantification of the human brain within several of its territories and to compare the results obtained using two different ASL protocols. Secondarily this study aimed to validate an ASL protocol to be used in clinical exams – Protocol #2 by comparing the values obtained for all the regions considered with the ones present in literature. Methods: The methodology used in this study was applied to fifteen adult volunteers. Two ASL protocols were used in a single functional imaging session. Subjects were asked to perform a motor finger tapping task with their right hand while being scanned. Images were acquired on a 3 Tesla equipment – Magnetom Verio MRI System from SIEMENS in Hospital da Luz. For the definition of the regions to study the Talairach anatomical atlas was used and the brain was segmented considering five different segmentation levels. Results: Perfusion quantification studies have demonstrated that ASL allows a correct calculation of Cerebral Blood Flow (CBF), especially when compared to other studies which used other invasive perfusion measuring techniques. The perfusion values obtained for several regions considered are in agreement with the ones available in literature. Conclusions: ASL protocols are now becoming commercially available and have been demonstrating coherent results with other techniques already established. The current study presents one of the first detailed perfusion studies using this technique to evaluate several structures of the brain. The adequacy of Protocol 2 for functional studies was also proved considering the stimulus used.
Clarke, William. "Human cardiac magnetic resonance spectroscopy." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:b75351dc-e4eb-4856-b901-4ba486ffe175.
Повний текст джерелаElster, Lars. "Magnetic resonance in superconducting junctions." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY042/document.
Повний текст джерелаIn this thesis we investigate the possibility to change the charge current in superconducting junctions by manipulating the spin properties using magnetic resonance. We consider two different junctions: First, an unconventional Josephson junction between a conventional s-wave superconductor and an unconventional px-wave superconductor and second a half-metal/conventional superconductor junction. The spx junctions hosts two spin-polarized Andreev bound states, which are 2pi-periodic, giving rise to a spontaneous magnetization in equilibrium. This opens the possibility to manipulate the occupations of the Andreev levels using a time-dependent magnetic field. We show that the field induces coherent Rabi oscillations between different spin states of the junction that appear as resonances in the current-phase relation. For a cicularly polarized magnetic field, we find a spin selection rule, giving Rabi oscillations only in a certain range of superconducting phase differences, which provides a spin detection scheme. In contrary, for a linear polarization, there is no spin constraint on the Rabi oscillations. The field also induces non-coherent transitions including continuum states that act as refill and ionization processes for the Andreev levels. For a circularly polarized field, these field-induced processes do not provide a decay mechanism for Rabi oscillations, due to spin and energy constraints. For a linear polarization, the width of the Rabi resonances in the current-phase relation is determined by the field-induced ionization processes. In the half-metal/conventional superconductor junction no Andreev current may flow for a static magnetization direction, since the perfect spin polarization of the half-metal forbids Andreev reflection processes at the interface. We show that an Andreev current flows, if the half-metal is subject to ferromagnetic resonance. The precessing magnetization direction in the half-metal provides the necessary spin-flip mechanism. The current is driven by the precession of the magnetization direction that creates a non-equilibrium situation for the charge carriers. We also show for a point contact geometry that in a ferromagnet with non-zero minority carrier concentration the current is reduced and vanishes at equal minority and majority carrier concentrations. Additionally, we consider a more realistic, extended interface geometry. For a ballistic junction, the current is enhanced compared to a point contact geometry due to the larger number of transport channels. Furthermore, we show that disorder is most important in the ferromagnet. The Andreev current through the disordered junction is much larger than the current through a ballistic junction in the same geometry
Jekic, Mihaela. "Exercise Stress Cardiac Magnetic Resonance." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259633017.
Повний текст джерелаGreer, Mason. "Portable and Autonomous Magnetic Resonance." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1586359944642158.
Повний текст джерелаHarvey, Ian. "Magnetic resonance imaging in schizophrenia." Thesis, University of Edinburgh, 1991. http://hdl.handle.net/1842/19829.
Повний текст джерелаSmith, Gillian Clare. "Cardiovascular magnetic resonance in cardiomyopathies." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/10114.
Повний текст джерелаHirsch, Sebastian. "Compression-sensitive Magnetic Resonance Elastography." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17205.
Повний текст джерелаThis thesis introduces the concept of compression-sensitive Magnetic Resonance Elastography. Compression-sensitive MRE detects the propagation of pressure waves, providing insight into the compressibility of a material based on a poroelastic tissue model. Poroelastic models incorporate compressibility through interaction of compartments, even as each individual compartment remains incompressible. Hydrostatic tissue pressure abnormalities are associated with a number of diseases, such as normal pressure hydrocephalus or hepatic portal hypertension. Since pore pressure plays a central role in the poroelastic wave equations, compression-sensitive MRE could potentially serve as a diagnostic tool, providing information complimentary to shear-wave MRE data. This thesis describes the development of a fast single-shot EPI MR sequence capable of quantifying volumetric strain induced by external vibrations. Compression-sensitive MRE was validated in porous gel phantoms, in the human lung at two different respiratory states, in an ex vivo sheep liver at varying levels of hydrostatic pressure, and finally in human liver and brain. Results illustrate that compression-sensitive MRE is capable of quantifying volumetric strain in phantoms and in human organs. It was found that volumetric strain was sensitive toward pressure changes associated with different physiological states, whereas shear strain remained constant. In an additional study, pulsation of the human brain, driven by the heart cycle, was used as the actuation source instead of the external vibration generator. Results indicate local expansion of brain parenchyma upon the arrival of the arterial pulse wave, followed by a slow return to the initial state during the diastolic phase. Numerical values for the pressure wave modulus M were calculated from measured volumetric strain through inversion of the pressure wave equation. Measurement noise was identified as the primary effect causing a severe underestimation of M.
Bienfait, Audrey. "Magnetic resonance with quantum microwaves." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS297/document.
Повний текст джерелаIn usual electron-spin resonance (ESR) experiments, the coupling between spins and their electromagnetic environment is quite weak, severely limiting the sensitivity of the measurements. Using a Josephson parametric microwave amplifier combined with high-quality factor superconducting micro-resonators cooled at millikelvin temperatures, this work reports the design and implementation of an ESR setup where the detection sensitivity is limited by quantum fluctuations of the electromagnetic field instead of thermal or technical noise. Pulsed ESR measurements on an ensemble of Bismuth donors in Silicon spins demonstrate a sensitivity of 1700 spins within a single Hahn echo with unit signal-to-noise (SNR) ratio. The sensitivity of the setup is improved one step further by generating squeezed vacuum in the detection waveguide, reducing the amount of noise beyond the quantum limit. The high-quality factors and small mode volume superconducting microwave ESR resonator developed for enhanced sensitivity also enhances the spin-resonator coupling up to the point where quantum fluctuations have a dramatic effect on the spin dynamics. As a consequence, the spin spontaneous emission of microwave photons in the resonator is dramatically enhanced by the Purcell effect, making it the dominant spin relaxation mechanism. The relaxation rate is increased by three orders of magnitude when the spins are tuned to resonance, showing that spin relaxation can be engineered and controlled on-demand. Our results provide a novel and general way to initialize spin systems into their ground state, with applications in magnetic resonance and quantum information processing
Lee, Inhee. "Nanoscale Ferromagnetic Resonance Imaging using Magnetic Resonance Force Microscopy." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281111992.
Повний текст джерелаNorwood, Timothy John. "Nuclear magnetic resonance in homogeneous and inhomogeneous magnetic fields." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304456.
Повний текст джерелаChen, Way Cherng. "Magnetic susceptibility-based white matter magnetic resonance imaging techniques." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:7272b7e6-1fb9-4a1b-a71f-2ce5dfe93fde.
Повний текст джерелаKrueger, Dirk. "Positive contrast magnetic resonance imaging with multifunctionalised magnetic nanoparticles." Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/positive-contrast-magnetic-resonance-imaging-with-multifunctionalised-magnetic-nanoparticles(37055346-b146-4133-9ee7-b836785cdc29).html.
Повний текст джерелаNylund, Andreas. "Off-resonance correction for magnetic resonance imaging with spiral trajectories." Thesis, KTH, Medicinsk teknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147925.
Повний текст джерелаTymofiyeva, Olga. "Magnetic resonance imaging in dental medicine." Göttingen Sierke, 2010. http://d-nb.info/1002094976/04.
Повний текст джерелаMcDougall, Mary Preston. "Single echo acquisition magnetic resonance imaging." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3324.
Повний текст джерела