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Related Experiment Videos

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

N K Chen1, A M Wyrwicz

  • 1Center for MR Research, Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60201, USA.

Magnetic Resonance in Medicine
|June 17, 1999
PubMed
Summary

This study introduces a new method for correcting echo planar imaging distortions using multi-echo field maps. The technique effectively reduces geometric distortions without phase unwrapping, improving image quality.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Image Processing
  • Medical Physics

Background:

  • Echo planar imaging (EPI) is prone to geometric distortions.
  • These distortions arise from off-resonance effects like field inhomogeneity and chemical shift.
  • Existing correction methods often require complex phase unwrapping, limiting their applicability.

Purpose of the Study:

  • To present a novel and effective technique for distortion correction in EPI.
  • To reduce geometric distortions caused by various off-resonance factors simultaneously.
  • To develop a method that avoids phase unwrapping in field map processing.

Main Methods:

  • Utilizing field maps derived from multi-echo gradient-echo images.
  • Implementing a post-processing algorithm called multi-channel modulation.

Related Experiment Videos

  • Applying the technique to phantom and animal experiments at 4.7 Tesla.

    • Main Results:

    • Simultaneous reduction of distortions from field inhomogeneity, eddy currents, frequency offset, and chemical shift.
    • Successful correction of geometrical distortions in gradient-echo EPI.
    • Demonstrated efficiency of the multi-channel modulation method in phantom and animal studies.

    Conclusions:

    • The proposed technique offers an effective solution for EPI distortion correction.
    • The multi-channel modulation approach simplifies correction by avoiding phase unwrapping.
    • This method enhances the reliability and applicability of EPI in MRI research and diagnostics.