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View angle tilting echo planar imaging for distortion correction
Author(s) -
Ahn Sinyeob,
Hu Xiaoping P.
Publication year - 2012
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.23320
Subject(s) - echo planar imaging , imaging phantom , distortion (music) , planar , encode , physics , phase (matter) , optics , phase distortion , echo (communications protocol) , spin echo , computer science , nuclear magnetic resonance , magnetic resonance imaging , bandwidth (computing) , chemistry , telecommunications , medicine , amplifier , biochemistry , computer graphics (images) , computer network , quantum mechanics , gene , radiology
Geometric distortion caused by field inhomogeneity along the phase‐encode direction is one of the most prominent artifacts due to a relatively low effective bandwidth along that direction in magnetic resonance echo planar imaging. This work describes a method for correcting in‐plane image distortion along the phase‐encode direction using a view angle tilting imaging technique in spin‐echo echo planar imaging. Spin‐echo echo planar imaging with view angle tilting uses the addition of gradient blips along the slice‐select direction, concurrently applied with the phase‐encode gradient blips, producing an additional phase. This phase effectively offsets an unwanted phase accumulation caused by field inhomogeneity, resulting in the removal of image distortion along the phase‐encode direction. The proposed method is simple and straightforward both in implementation and application with no scan time penalty. Therefore, it is readily applicable on commercial scanners without having any customized postprocessing. The efficacy of the spin‐echo echo planar imaging with view angle tilting technique in the correction of image distortion is demonstrated in phantom and in vivo brain imaging. Magn Reson Med, 2012. © 2011 Wiley Periodicals, Inc.