Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 1351 for “"Magnetic Resonance Imaging"”.
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Dynamic Magnetic Resonance Imaging
… for the dynamic image reconstruction problem in magnetic resonance imaging (MRI). The proposed imaging method, the ensemble Kalman filter, is a Monte Carlo approximation to the Kalman filter with reduced computational cost. The technique reconstructs images of snapshots taken during a cardiac …
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Magnetic Resonance Imaging of Atherosclerosis
… the severity of atherosclerosis. High-resolution magnetic resonance (MR) imaging is an emerging imaging technique, which has shown great promise in providing detailed information about plaque pathobiology besides luminal stenosis. Using a special contrast medium called ultrasmall superparamagnetic …
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Adaptive functional magnetic resonance imaging
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 …
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Advanced Magnetic Resonance Imaging of Osteoarthritis
This thesis examines the potential utility of magnetic resonance (MR) quantitative imaging biomarkers (QIBs) of knee osteoarthritis (OA) for rapid assessment of treatment efficacy in experimental medicine studies. The development of treatments able to modify disease in OA is hampered by an …
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Gradient characterization in magnetic resonance imaging
Special magnetic resonance (MR) scans, such as spiral imaging and echo-planar imaging, require speed and gradient accuracy while putting high demands on the MR gradient system that may cause gradient distortion. Additionally, high field MR scans are prone to inhomogeneities that disturb the …
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Portable low-cost magnetic resonance imaging
Purpose: As the premiere modality for brain imaging, MRI could find wider applicability if lightweight, portable systems were available for siting in unconventional locations such as intensive care units (ICUs), physician offices, surgical suites, ambulances, emergency rooms, sports facilities, or …
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Magnetic Resonance Imaging of Cerebral Venous Oxygenation
… and volume reduction in these regions. Imaging marker Yᵥ reported here may prove valuable in the understanding of hypoxia effect, hypoperfusion and cortical volume reduction caused by hypertension. The second study aims to develop an R2*-based MR oximetry that can measure cerebral Yᵥ in …
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Dynamic Magnetic Resonance Imaging for Tumor Prognosis
… Because deoxyhemoglobin (dHbO2) is paramagnetic and oxyhemoglobin (HbO2) is non-magnetic, the change of concentration of deoxyhemoglobin and oxyhemoglobin can cause a Bulk Magnetic Susceptibility (BMS) change and the T2* signal response during MR imaging. Here, I applied this technique …
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Magnetic Resonance Imaging in Paediatric Coronary Vasculopathy
… MRI has the potential to achieve this by imaging coronary lumen, vessel wall and central vascular stiffness in a child-friendly free-breathing protocol lasting thirty minutes. Methods A three-dimensional steady-state-free-precession [3D SSFP) imaging sequence for coronary artery lumen …
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Novel Tools for Interventional Magnetic Resonance Imaging
Magnetic Resonance Imaging (MRI) provides unique advantages such as superior soft tissue contrast, true multiplanar imaging, variable contrast mechanisms, measurement of temperature changes, perfusion and diffusion, and no ionizing radiation. Despite considerable research efforts in the field of …
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Rank constrained denoising in magnetic resonance imaging
Noise is an important issue in magnetic resonance imaging (MRI), since the signal-to-noise ratio (SNR) is a major limiting factor for imaging speed and the achievable spatial resolution. This thesis investigates the utility of low-rank property in the denoising problem for the following two MRI …
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Functional Magnetic Resonance Imaging of Breast Cancer
This thesis examines the use of magnetic resonance imaging (MRI) techniques in the detection of breast cancer and the prediction of pathological complete response (pCR) to neoadjuvant chemotherapy (NACT). This thesis compares the diagnostic performance of diffusion-weighted imaging (DWI) models in …
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Birdcage resonator design in magnetic resonance imaging
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1995.
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Acoustical-molecular techniques for magnetic resonance imaging
Magnetic resonance imaging (MRI) is a remarkably flexible diagnostic platform due to the variety of clinically relevant physical, chemical, and biological phenomena it can detect. In addition to the host of endogenous contrast mechanisms available, MRI functionality can be further extended by …
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Superparamagnetic contrast agents for magnetic resonance imaging
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1994.
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Temperature Mapping using Mid-Field Magnetic Resonance Imaging
Magnetic Resonance Imaging (MRI) is a non-invasive imaging modality with excellent soft tissue contrast and sensitivity to tissue temperature. MRI use is growing in Canada with expectation that this is expected to continue in the medium term, with more wide adoption of MRI and in particular a …
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Multiparametric cardiac magnetic resonance imaging with motion compensation
Magnetic resonance imaging is a non-invasive imaging modality for the diagnosis of cardiovascular diseases. A broad range of diagnostic parameters can be obtained within a single examination, including information about morphology, physiology and tissue viability. Currently, qualitative …
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