Correction for EPI distortions using multi-echo gradient-echo imaging.


Journal Article

A novel and effective technique is described for distortion correction in echo planar imaging (EPI) utilizing the field maps derived from multi-echo gradient-echo images. The distortions from different off-resonance related factors such as field inhomogeneity, eddy current effect, radiofrequency pulse frequency offset, and chemical shift effect can be simultaneously reduced to a great extent. With the proposed post-processing algorithm of multi-channel modulation, distortions may be corrected without unwrapping the phase discontinuities in the derived field map, a process that usually restricts the application of other field map-based correction methods. Results from phantom and animal experiments at 4.7 T demonstrate the efficiency of the method in reducing the geometrical distortions in gradient-echo EPI.

Full Text

Duke Authors

Cited Authors

  • Chen, NK; Wyrwicz, AM

Published Date

  • June 1999

Published In

Volume / Issue

  • 41 / 6

Start / End Page

  • 1206 - 1213

PubMed ID

  • 10371453

Pubmed Central ID

  • 10371453

International Standard Serial Number (ISSN)

  • 0740-3194

Digital Object Identifier (DOI)

  • 10.1002/(sici)1522-2594(199906)41:6<1206::aid-mrm17>;2-l


  • eng

Conference Location

  • United States