University of Illinois Urbana-Champaign

Distortion correction in magnetic resonance imaging using the simulated point spread function

LaBelle, Genevieve Marie

Content Files
LABELLE-THESIS-2016.pdf

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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
Date of Ingest
2016-07-07T20:27:54Z
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.
Graduation Semester
2016-05
Type of Resource
text
Permalink
http://hdl.handle.net/2142/90809
Copyright and License Information
Copyright 2016 Genevieve LaBelle

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Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at Illinois