Correction of off resonance-related distortion in echo-planar imaging using EPI-based field maps

Paul J. Reber, Eric C. Wong*, Richard B. Buxton, Lawrence R. Frank

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

175 Scopus citations

Abstract

We present, here, a simple method for measurement and correction of off- resonance related geometric distortion in echo-planar imaging (EPI). This method uses high signal-to-noise ratio (SNR) EPI-based field maps, rapidly acquired using a series of gradient recalled images collected across a range of TE values. This field map is distorted in the same manner as the EPI images to be unwarped, providing a direct look-up table for the correct location of each pixel of data. This method adds very little scan time and is robust and easy to implement.

Original languageEnglish (US)
Pages (from-to)328-330
Number of pages3
JournalMagnetic resonance in medicine
Volume39
Issue number2
DOIs
StatePublished - Feb 1998

Keywords

  • Echo-planar imaging
  • Echo-planar imaging
  • Field map correction
  • Geometric distortion

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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