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Simultaneous correction for interscan patient motion and geometric distortions in echoplanar imaging
Author(s) -
Ernst T.,
Speck O.,
Itti L.,
Chang L.
Publication year - 1999
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/(sici)1522-2594(199907)42:1<201::aid-mrm27>3.0.co;2-y
Subject(s) - affine transformation , computer science , computer vision , data set , artificial intelligence , magnetic resonance imaging , image registration , nuclear medicine , mathematics , image (mathematics) , radiology , medicine , pure mathematics
A method is presented for simultaneous correction of linear geometric distortions and interscan patient motion in echoplanar imaging (EPI). The technique does not require the acquisition of specialized scans other than high‐resolution magnetic resonance images. The method is based on a generalized surface‐based coregistration algorithm, which accounts for a complete 3‐dimensional affine transformation, i.e., rotations, translations, scaling, and shearing, between two volumetric image data sets. Any minimally distorted high‐resolution scan may serve as a reference data set, to which the EPI data set is matched. The algorithmic accuracy was assessed using simulated data sets with known affine distortions. The deviation of the parameters determined by the coregistration program from the true values typically was 1% or less. Precise alignment of functional and anatomic information will be important for many future clinical applications. Magn Reson Med 42:201–205, 1999. © 1999 Wiley‐Liss, Inc.