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Comparison of navigator echo and centroid corrections of image displacement induced by static magnetic field drift on echo planar functional MRI
Author(s) -
Liu HoLing,
Kochunov Peter,
Lancaster Jack L.,
Fox Peter T.,
Gao JiaHong
Publication year - 2001
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/1522-2586(200102)13:2<308::aid-jmri1044>3.0.co;2-l
Subject(s) - echo planar imaging , displacement (psychology) , echo (communications protocol) , centroid , imaging phantom , magnetic resonance imaging , artifact (error) , physics , computer science , planar , nuclear magnetic resonance , computer vision , magnetostatics , artificial intelligence , magnetic field , medicine , optics , radiology , psychology , computer network , computer graphics (images) , quantum mechanics , psychotherapist
Image displacement caused by static magnetic field drift may result in serious edge artifacts in echo‐planar functional magnetic resonance imaging (MRI). We compared navigator echo and centroid methods for correcting the artifacts for phantom and in vivo studies. A motor‐stimulation fMRI study was performed to demonstrate the possible effects due to the displacement. The navigator echo method was shown to be the superior technique for the correction of image displacement by effectively eliminating edge artifacts, resulting in improved functional maps. J. Magn. Reson. Imaging 2001;13:308–312. © 2001 Wiley‐Liss, Inc.