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 13 of 13 for “"quantitative susceptibility mapping"”.
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Quantitative susceptibility mapping and susceptibility-based distortion correction of echo planar images
… that arise from changes in magnetic susceptibility throughout the object of interest. Distortion is typically corrected by acquiring an additional scan called a fieldmap. A fieldmap provides a direct measure of the magnetic perturbations, allowing distortions to be easily computed and …
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Acquisition and reconstruction methods for magnetic resonance imaging
… as magnetic resonance spectroscopic imaging, quantitative susceptibility mapping, functional MRI, and diffusion MRI. Despite its great versatility, MRI is limited by the long time required to acquire the data needed to form an image. Since a typical MRI protocol consists of multiple scans of …
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Reconstruction algorithms for MRI
… Imaging (DSI), Chemical Shift Imaging (CSI), and Quantitative Susceptibility Mapping (QSM). The main theme connecting the proposed methods is the utilization of prior knowledge on the reconstructed signal. This prior often presents itself in the form of sparsity with respect to either a …
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Measuring Brain Iron In Healthy Controls And Accessing Venous Abnormalities In Parkinson's Disease Using Mri
… in neurodegenerative disorders, a robust in vivo quantitative non-invasive assessment of normal brain iron deposition over time is essential. A variety of magnetic resonance imaging (MRI) methods have been used to quantify iron both in vivo and in vitro non-invasively. We first created the …
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Bilateral Ortohogonality Generative Acquisitions Method for Transmit Field Inhomogeneity Correction in Magnetic Resonance Imaging
… of the phase information is validated by quantitative susceptibility mapping in brain and Dixon imaging in liver and kidney. The multi-contrast turbo spin echo application of the method is also demonstrated for T1, T2 and proton density weighted MRI contrasts. Lastly, implementations of …
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Identification of Intracranial Lesions With Dual-Energy Computed to mography and Magnetic Resonance Phase Imaging
… Echo (GRE) MRI, these lesions appear as “foci of susceptibility” in which their signal is hypointense due to the magnetic susceptibility of the lesions differing from that of the background tissue.</p> <p>Dual-energy Computed Tomography (DECT) and Phase-Sensitive Magnetic Resonance Imaging …
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Further development of magnetic resonance spectroscopic imaging using subspace-based models
… for high-resolution, high-SNR metabolic mapping at clinically relevant imaging speeds. This work further extends subspace-based MRSI methods along two major avenues. First, we have developed a novel method for simultaneously providing tissue magnetic susceptibility information and …
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Magnetic Resonance Imaging Biomarkers of Renal Structure and Function
… nephropathy in sprague dawley.</p><p>2) Quantitative susceptibility mapping of kidney inflammation and fibrosis in type 1 angiotensin receptor-deficient mice. </p><p>3) Susceptibility tensor imaging of the kidney and its microstructural underpinnings. </p><p>4) 4D MRI of renal function in …
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Magnetic Resonance Imaging of Susceptibility Effects in Carotid Atherosclerosis
This thesis explores the use of susceptibility-weighted imaging (SWI) and quantitative susceptibility mapping (QSM), to characterize carotid artery plaques with and without the use of ultrasmall superparamagnetic iron oxide (USPIO) nanoparticle contrast agents. The overall hypothesis is that QSM …
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DTI-ALPS REFLECTS WHITE MATTER DIFFUSION ANISOTROPY AND MICROSTRUCTURAL HETEROGENEITY RATHER THAN GLYMPHATIC FLOW: INSIGHTS FROM MULTI-MODAL MRI
… and multi-echo gradient-echo sequences for quantitative susceptibility mapping. Within standard centrum semiovale regions of interest, we computed DTI-ALPS together with fractional anisotropy (FA), mean diffusivity (MD), mode of anisotropy (MA), and neurite orientation and density imaging …
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Probing Tissue Microstructure Using Susceptibility Contrast Magnetic Resonance Imaging
… and growth in the past decade is magnetic susceptibility imaging. Imaging tissue susceptibility provides insight into the microstructural organization and chemical properties of biological tissues, but this image contrast is not well understood. The purpose of this work is to develop …
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Model-based reconstruction for correcting magnetic susceptibility-induced artifacts in magnetic resonance imaging
While magnetic susceptibility is an essential contrast mechanism in magnetic resonance imaging (MRI), it also causes significant disruptions to the imaging process. Strong differences in magnetic susceptibility exist at the air and tissue interfaces in the brain, resulting in a magnetic field …
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MR Susceptibility Mapping: Improved Quantification and Applications in Developmental Brain Imaging
… or brain development. Prior studies using quantitative susceptibility mapping (QSM) have shown its unique sensitivity to myelin. However, due to the cylindrical structure of myelin sheaths wrapping around axons, the magnetic susceptibility measured by QSM of the white matter has been found …