title: Correction for distortion of echo-planar images used to calculate the apparent diffusion coefficient.
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.
authors.affiliation: Department of Radiology, Children's Hospital of Philadelphia, PA 19104, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Haselgrove
authors.forename: J R
authors.initials: JR
authors.lastname: Moore
mesh_terms: D000465:Algorithms; D001921:Brain / Q000473:pathology; D017352:Echo-Planar Imaging / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D012680:Sensitivity and Specificity