A B(0) shift correction method based on edge RMS reduction for EPI fMRI

J Magn Reson Imaging. 2000 Dec;12(6):956-9. doi: 10.1002/1522-2586(200012)12:6<956::aid-jmri21>3.0.co;2-5.

Abstract

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.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Artifacts
  • Brain / anatomy & histology
  • Brain / physiology
  • Echo-Planar Imaging / methods*
  • Humans
  • Image Processing, Computer-Assisted*
  • Magnetic Resonance Imaging / methods*
  • Motor Activity / physiology
  • Phantoms, Imaging
  • Sensitivity and Specificity