Correction for Distortion of Echo-Planar Images Used to Calculate the Apparent Diffusion Coefficient

Magn Reson Med. 1996 Dec;36(6):960-4. doi: 10.1002/mrm.1910360620.

Abstract

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.

MeSH terms

  • Algorithms*
  • Brain / pathology
  • Echo-Planar Imaging / methods*
  • Humans
  • Image Enhancement / methods*
  • Sensitivity and Specificity