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

magnetic resonance imaging;point spread function;distortion;distortion correction;field inhomogeneity

LaBelle, Genevieve Marie ; Sutton ; Brad P.

关键词: magnetic resonance imaging;    point spread function;    distortion;    distortion correction;    field inhomogeneity;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/90809/LABELLE-THESIS-2016.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

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.