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

Nan Kuei Chen, Alice M. Wyrwicz

Research output: Contribution to journalArticlepeer-review

111 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1206-1213
Number of pages8
JournalMagnetic Resonance in Medicine
Volume41
Issue number6
DOIs
StatePublished - 1999
Externally publishedYes

Keywords

  • Echo planar imaging (EPI)
  • Field mapping
  • Geometrical distortions
  • Multi-channel modulation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Fingerprint

Dive into the research topics of 'Correction for EPI distortions using multi-echo gradient-echo imaging'. Together they form a unique fingerprint.

Cite this