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.
Results
Showing 1 to 20 of 1584 for “"MRI"”.
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Reconstruction algorithms for MRI
… algorithms for Magnetic Resonance Imaging (MRI) that aims to increase the imaging efficiency. Algorithms that reduce imaging time without sacrificing the image quality and mitigate image artifacts are proposed. The goal of increasing the MR efficiency is investigated across multiple imaging …
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Dynamic Contrast-Enhanced MRI and Diffusion-Weighted MRI for the Diagnosis of Bladder Cancer
… the abilities of 3T dynamic contrast-enhanced MRI (DCE-MRI) and diffusion-weighted MRI (DWI) to improve the detection and staging and to enable the prediction of chemotherapeutic response in bladder cancer. A total of fifty-three patients were enrolled in the study. Different inclusion criteria …
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Measurements of MRI Induced Heating
The appeal of magnetic resonance imaging (MRI) stems from the fact that it can generate internal images of the human body noninvasively, with high temporal and contrast resolution, and without requiring ionizing radiation. Instead, MRI requires the use of a relatively safe radio frequency (RF) …
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Improving Quality of Prostate MRI
… and grading of PCa. Given that prostate MRI has been established as a crucial tool in the PCa diagnostic pathway, the latter half of this chapter introduced key concepts of prostate MRI, including its evolving role and the widely adopted international guidelines, Prostate Imaging …
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Unsupervised skull stripping in MRI
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Motion Phantom Development for MRI
The development of magnetic resonance imaging (MRI) has enabled health care professionals to non-invasively visualize subjects' soft tissue for medical diagnosis. Since it's conception, artifacts due to patients' movement have shown themselves to be an issue and an assortment of tools and methods …
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Joint CT-MRI Image Reconstruction
… tomography (CT) and magnetic resonance imaging (MRI) data is developed and evaluated. The method proposed in this study is part of the planned joint CT-MRI system which assembles CT and MRI subsystems into a single entity. The CT and MRI images are synchronously acquired and registered from the …
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MRI Safety Evaluation of Dual Leads and Fractured Leads Active Implantable Medical Devices in MRI
Magnetic resonance imaging (MRI) radiofrequency (RF)-induced heating is of great concern for patients with active implantable medical devices (AIMDs) undergo MR scanning. RF safety evaluation of AIMDs consists of two steps: (1) the development of the AIMD model (i.e., transfer function (TF) …
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Methods and adaptations required to perform small-animal MRI scanning using a large bore clinical MRI
… models is magnetic resonance imaging (MRI). The aim of this project was to adapt a clinical MRI system to perform small-animal cardiac MRI. The first part of the thesis describes the adaptations required, which included design and construction of a small-animal radiofrequency (RF) coil, …
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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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Image processing in echography and MRI
… in cardiac magnetic resonance imaging<br/>(MRI) and flow feature visualisation in velocity MRI.<br/><br/>For speckle detection, a learning from data approach was taken using pattern recognition<br/>principles and low-level image features, including signal-to-noise ratio, …
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Using SABRE in NMR and MRI
… technique in both NMR spectroscopy and MRI. Hyperpolarisation is a method of generating enhanced magnetic resonance signals to improve signal to noise, contrast and resolution within those techniques. The primary aim of this thesis was to develop the SABRE method in the context of …
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Self-supervised multi-contrast MRI denoising
Magnetic Resonance Imaging (MRI) is pivotal in medical diagnostics, offering essential multi-contrast imaging capabilities. However, MRI quality is often compromised by inherent noise, which can hinder both image clarity and analytical accuracy. This thesis presents the "Corruption2Self" (C2S) …
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Novel approaches to MRI of glioma
… homeostasis. Non-invasive detection of 23Na with MRI has the potential to quantify sodium concentration and therefore could be an imaging probe of cell morphology and membrane function within the tumour microenvironment, as well as a method of probing tissue heterogeneity. During my PhD, a novel …
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Cortical structure: Linking MRI and cytoarchitecture
MRI provides a powerful tool to investigate brain structure in living humans. However a major challenge is interpreting the biological underpinnings of changes at this scale. This dissertation describes investigations into the problem of linking microscale post mortem cortical cytoarchitecture with …
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Monofilament MgB₂ wires for MRI magnets
MRI magnets are useful medical devices in early detection and efficient treatment of disease or injury. Because of the significant better performance, MRI magnets are made of superconductors rather than made of copper. Nowadays, there are over 20,000 superconducting MRI magnets installed worldwide. …
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Temporal registration for MRI time series
… method to correct for motion and deformations in MRI time series. We make a Markov assumption on the nature of deformations to take advantage of the temporal smoothness in the image data. Forward message passing in the corresponding hidden Markov model (HMM) yields an estimation algorithm that …
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Learning Deformable Templates for Brain MRI
… We demonstrate our method on a large 3D brain MRI dataset. This is particularly relevant in medical image analysis where templates are difficult to build. We show that this framework can learn sharp templates representative of the population. These templates are representative of the …
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MRI of structured-based ventricular mechanics
… method, registered diffusion and strain MRI, to acquire information about myocardial architecture and myocardial strain under identical in-vivo conditions. This noninvasive methodology solves important limitations of existing methods all of which require myocardial dissection. It provides …
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Diffusion MRI of complex tissue structure
Magnetic resonance diffusion imaging provides an exquisitely sensitive probe of tissue microstructure. Owing to the microscopic length scale of diffusion in biological tissues, diffusion imaging can reveal histological architecture irresolvable by conventional magnetic resonance imaging methods. …
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