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Correction of off resonance‐related distortion in echo‐planar imaging using EPI‐based field maps
Author(s) -
Reber Paul J.,
Wong Eric C.,
Buxton Richard B.,
Frank Lawrence R.
Publication year - 1998
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.1910390223
Subject(s) - echo planar imaging , echo (communications protocol) , nuclear magnetic resonance , distortion (music) , planar , field (mathematics) , magnetic resonance imaging , physics , computer science , artificial intelligence , mathematics , medicine , radiology , computer graphics (images) , computer network , amplifier , pure mathematics , optoelectronics , cmos
Abstract We present, here, a simple method for measurement and correction of off‐resonance related geometric distortion in echo‐planar imaging (EP1). This method uses high signal‐to‐noise ratio (SNR) EPI‐based field maps, rapidly acquired using a series of gradient recalled images collected across a range of TE values. This field map is distorted in the same manner as the EPI images to be unwarped, providing a direct look‐up table for the correct location of each pixel of data. This method adds very little scan time and is robust and easy to implement.