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A B 0 shift correction method based on edge RMS reduction for EPI fMRI
Author(s) -
Kochunov Peter V.,
Liu HoLing,
Andrews Trevor,
Gao JiaHong,
Fox Peter T.,
Lancaster Jack L.
Publication year - 2000
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(200012)12:6<956::aid-jmri21>3.0.co;2-5
Subject(s) - functional magnetic resonance imaging , computer science , pulse sequence , reduction (mathematics) , encoding (memory) , pulse (music) , square root , root mean square , phase (matter) , enhanced data rates for gsm evolution , magnetic resonance imaging , nuclear magnetic resonance , mean squared error , artificial intelligence , algorithm , physics , mathematics , medicine , statistics , telecommunications , radiology , geometry , quantum mechanics , detector
Shifting of echoplanar images (EPI) in the phase‐encoding direction during functional magnetic resonance imaging (fMRI) experiments can be observed due to B 0 drift. These shifts can cause artifacts in functional activation maps that can be corrected using a navigator echo (NE) technique, but the NE correction requires pulse sequence modifications not available on many clinical systems. A fast, postprocessing correction method based on edge root‐mean‐square error reduction (ERMSR) is introduced and shown to provide an equivalent correction. J. Magn. Reson. Imaging 2000;12:956–959. © 2000 Wiley‐Liss, Inc.