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 23 for “"MR Image"”.
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POCS Augmented CycleGAN for MR Image Reconstruction
Traditional Magnetic Resonance Imaging (MRI) reconstruction methods, which may be highly time-consuming and sensitive to noise, heavily depend on solving nonlinear optimization problems. By contrast, deep learning (DL)-based reconstruction methods do not need any explicit analytical data model and …
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Efficient automatic correction and segmentation based 3D visualization of magnetic resonance images
… processing techniques for digital medical image volumes has increased substantially. Existing algorithms, however, still often require manual interaction, and newly developed automated techniques are often intended for a narrow segment of processing needs. The goal of this research was to …
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Optimization of Fast MR Imaging Technologies using the Case-PDM to Quantitatively Assess Image Quality
… an extraordinary number of ways to create an MR image, and the number seems to grow daily. In almost all cases, images will be viewed by radiologists to make a diagnosis, to stage a disease, to apply a treatment, and/or to assess a treatment. Since images are viewed, one needs to assess visual …
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Multispectral segmentation of whole-brain MRI
Magnetic Resonance Imaging (MRI) is a widely used medical technology for diagnosis and detection of various tissue abnormalities, tumor detection, and in evaluation of either residual or recurrent tumors. This thesis work exploits MRI information acquired on brain tumor structure and physiological …
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Catheter based magnetic resonance compatible perfusion probe
… taken with the TDP, with magnetic resonance (MR) perfusion imaging. MR perfusion imaging provides an excellent, but relative, global assessment of compromised tissue perfusion. Due to the many clinical and diagnostic benefits of real-time, absolute quantification of blood flow acquired by the …
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Usefulness of [18F]-Deoxyglucose Positron Emission Tomography in Diagnosing the Patients with Corticobasal Degeneration
… in this study. Quantitative brain FDG PET and MRI scan studies were performed simultaneously in all subjects. For better spatial normalization of PET image, individual MR image was used for the normalization template. Using the group comparison model in the SPM2 software, we compared the local …
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Bayesian Latent Class Models
… applications. The first work is about the MR image segmentation. For MR images, we usually need to simultaneously segment multiple images, which are believed to have similar segmentation results. In our co-segmentation model, a Markov random field prior is utilized to encourage the …
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Advanced image reconstruction in parallel magnetic resonance imaging : constraints and solutions.
… consideration for magnetic resonance imaging (MRI). The speed of conventional MRI is limited by hardware performance and physiological safety measures. "Parallel" MRI is a new technique that circumvents these limitations by utilizing arrays of radiofrequency detector coils to acquire data in …
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Tissue Sodium in CKD Patients
… of CKD patients, using 23Na magnetic resonance (MR) imaging. Methods: This is a pilot cross-sectional study of CKD stage 4-5D patients and healthy controls. Subjects underwent a 23Na MR study of their right lower leg using a multinuclear-capable 3.0-T MRI. An axial proton T1-weighted …
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Analysis and Measurement of Motion in 2D Medical Imaging Sequences Exploiting Uncertain Knowledge
… of moving and deformable structures in medical image processing has become an increasingly important research field in recent years. Fast and high-resolution image acquisition methods such as Magnetic Resonance (MR) imaging produce very detailed cross-sectional images of the human body. …
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On the dynamics of magnetic fluids in magnetic resonance imaging
… begun to be used in magnetic resonance imaging (MRI) where they have found application as contrast agents, improving the contrast to noise ratio of the received MR intensity. The major goal of this work was to assess the feasibility of modulating the signal intensity in MRI in regions near …
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Automatic Optimum Atlas Selection for Multi-Atlas Image Segmentation using Joint Label Fusion
<p>Multi-atlas image segmentation using label fusion is one of the most accurate state of the art image segmentation techniques available for biomedical imaging applications. Motivated to achieve higher image segmentation accuracy, reduce computational costs and a continuously increasing atlas data …
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Improved quantification in small animal PET/MR
… The combination of magnetic resonance imaging (MRI) and positron emission tomography (PET) provides excellent soft tissue contrast from MRI with exceptional sensitivity and specificity from PET. This thesis explores the use of sequentially acquired PET and MR images to improve the quantification …
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Volumetric, Magnetic Resonance-Visible, and Radiation-Sensitive Detectors For Magnetic Resonance Image-Guided Radiation Therapy
… DETECTORS FOR MAGNETIC RESONANCE IMAGE-GUIDED RADIATION THERAPY</h1> <p>Hannah Jungeun Lee</p> <p>Advisory Professor: Geoffrey S. Ibbott, Ph.D.</p> <p>Due to the superior soft-tissue contrast of magnetic resonance imaging (MRI) compared to conventional computed tomography (CT) and …
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Multi Spectral Data Analysis for Diagnostic Enhancement of Pediatric Spinal Cord Injury
… this work new multispectral magnetic resonance (MR) image based approaches were developed for high-throughput extraction of quantitative features from pediatric spinal cord MR images and subsequent analysis using decision support algorithms. This may potentially improve diagnostic, prognostic, …
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Distortion-optimal parallel MRI with sparse sampling: from adaptive spatio-temporal acquisition to self-calibrating reconstruction
… pertain to parallel magnetic resonance imaging (pMRI). The first part of this dissertation addresses adaptive design of spatio-temporal acquisition and reconstruction in model-based pMRI wherein the signal model is a sparse support. We develop a highly-accelerated real-time dynamic MRI technique, …
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Magnetic Resonance Imaging of Susceptibility Effects in Carotid Atherosclerosis
… Furthermore, the use of USPIO-contrast agents to image inflammation is described. Chapter 2 describes the physical principles of MR image generation including the sensitivity to magnetic susceptibility. The principles of T2*w imaging, and susceptibility weighted imaging (SWI) are explained. …
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Fast and Robust Automatic Segmentation Methods for MR Images of Injured and Cancerous Tissues
<p>Magnetic Resonance Imaging: MRI) is a key medical imaging technology. Through in vivo soft tissue imaging, MRI allows clinicians and researchers to make diagnoses and evaluations that were previously possible only through biopsy or autopsy. However, analysis of MR images by domain experts can be …
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In silico modelling to advance arterial spin labelling magnetic resonance imaging
… spin labelling (ASL) magnetic resonance imaging (MRI) of the lungs is an imaging methodology used for the measurement of pulmonary perfusion. Unlike other pulmonary perfusion imaging techniques such as Positron emission tomography (PET), Single-photon emission computed tomography and Computed …
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EVALUATION OF INTERPOLATION AND REGISTRATION TECHNIQUES IN MAGNETIC RESONANCE IMAGE FOR ORTHOGONAL PLANE SUPER RESOLUTION RECONSTRUCTION
… (SRR) combines several perspectives of an image (typically low resolution) in order to reconstruct a more complete and comprehensive (higher resolution) image. The aim is to use this concept on magnetic resonance imaging (MRI) data, for which the standard is to scan in several-plane …
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