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Correction for geometric distortion in echo planar images from B 0 field variations
Author(s) -
Jezzard Peter,
Balaban Robert S.
Publication year - 1995
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.1910340111
Subject(s) - planar , echo (communications protocol) , distortion (music) , echo planar imaging , geometric phase , field (mathematics) , computer vision , artificial intelligence , computer science , physics , mathematics , computer graphics (images) , magnetic resonance imaging , telecommunications , pure mathematics , radiology , quantum mechanics , medicine , computer network , amplifier , bandwidth (computing)
A method is described for the correction of geometric distortions occurring in echo planar images. The geometric distortions are caused in large part by static magnetic field inho‐mogeneities, leading to pixel shifts, particularly in the phase encode direction. By characterizing the field inhomogeneities from a field map, the image can be unwarped so that accurate alignment to conventionally collected images can be made. The algorithm to perform the unwarping is described, and results from echo planar images collected at 1.5 and 4 Tesla are shown.