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Correction for distortion of echo‐planar images used to calculate the apparent diffusion coefficient
Author(s) -
Haselgrove John C.,
Moore James R.
Publication year - 1996
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.1910360620
Subject(s) - diffusion , distortion (music) , planar , translation (biology) , echo planar imaging , echo (communications protocol) , phase (matter) , encoding (memory) , phase distortion , line (geometry) , effective diffusion coefficient , diffusion mri , algorithm , nuclear magnetic resonance , mathematics , computer science , physics , artificial intelligence , geometry , chemistry , magnetic resonance imaging , computer graphics (images) , computer network , amplifier , bandwidth (computing) , biochemistry , quantum mechanics , radiology , thermodynamics , medicine , messenger rna , gene
An algorithm for correcting the distortions that occur in diffusion‐weighted echo‐planar images due to the strong diffusion‐sensitizing gradients is presented. The dominant distortions may be considered to be only changes of scale coupled with a shear and linear translation in the phase‐encoding direction. It is then possible to correct for them by using an algorithm in which each line of the image in the phase‐encoding direction is considered in turn, with only one parameter (the scale) to be found by searching.