Distortion correction in magnetic resonance imaging using the simulated point spread function
LaBelle, Genevieve Marie
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https://hdl.handle.net/2142/90809
Description
Title
Distortion correction in magnetic resonance imaging using the simulated point spread function
Author(s)
LaBelle, Genevieve Marie
Issue Date
2016-04-26
Director of Research (if dissertation) or Advisor (if thesis)
Sutton, Brad P.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
magnetic resonance imaging
point spread function
distortion
distortion correction
field inhomogeneity
Abstract
Geometric distortion is a highly prevalent issue for echo-planar 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 generated entirely through simulation using the trajectory and measured field map. The distortion correction with this approach is shown to be better than k-space based iterative reconstructions and is robust to high differentials in magnetic field maps when we use an optimal trajectory. In addition, this technique is well-suited to parallel implementation, as the system matrix used is sparse.
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