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 7 of 7 for “"Field map"”.
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Recovery of high-resolution magnetic field distribution inside the brain from limited MRI data using machine learning prior
High-resolution field maps in brain magnetic resonance imaging (MRI) scans provide the field distribution information inside the brain which is essential in reconstructing high-quality MR images with no artifacts and distortions. These high-quality images are highly desired in clinical …
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Distortion correction in magnetic resonance imaging using the simulated point spread function
… imaging (EPI), due to long readout times and field inhomogeneity. Previously, the measured point spread function (PSF) has been shown to be effective in correcting this distortion. In this work, we reconstruct an image quickly and address the distortion with a point spread function that was …
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Imaging Techniques and Hardware for Inhomogeneous MRI
… For traditional MRI, the static magnetic field, B_0, must be highly homogeneous. Obtaining this homogeneity can be difficult. Traditional MRI also requires linear gradient fields that are directed along the static field direction. Under these conditions a Fourier transform relationship …
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A Biomimetic, Energy-Harvesting, Obstacle-Avoiding, Path-Planning Algorithm for UAVs
… Flow Method (PFM); the other method seeds a wind-field map based on updraft peak analysis and then applies a variant of the Bellman-Ford algorithm to find the minimum-cost path. Both methods are enhanced by taking into account the performance characteristics of the aircraft using advanced …
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Construction and Testing of a Portable Time Projection Chamber for Fast Neutron Detection
… to each other, building a combined radiation field map and reducing the time to locating a source through a shared probabilistic model. A portable, directional fast neutron detector will aid in International Atomic Energy Agency (IAEA) inspections, portal security monitoring, emergency …
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Making Nuclear Magnetic Hyperpolarization Practical through Storage in Disconnected Eigenstates
… agent, yielding insights about the optimal field strength for imaging. Second, I show that it is possible to rapidly discover and characterize disconnected eigenstates by showing that they can be measured without synthesizing the isotopically labeled compound. Third, I extend the spin …
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Optimization of Image Guided Radiation Therapy for Lung Cancer Using Limited-angle Projections
… 4D-CBCT images through applying deformation field maps to existing prior planning 4D-CT images. The deformation field maps are solved using two steps: first, a principal component analysis based motion model is built using the planning 4D-CT (motion modeling). The deformation field map is …