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View angle tilting echo planar imaging for distortion correction.

Sinyeob Ahn1, Xiaoping P Hu

  • 1The Wallace H. Coulter Department of Biomedical Engineering, Biomedical Imaging Technology Center, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30322, USA.

Magnetic Resonance in Medicine
|January 4, 2012
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel method to correct geometric distortion in magnetic resonance echo planar imaging. The view angle tilting technique effectively removes phase-encode direction artifacts without increasing scan time.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Neuroimaging

Background:

  • Geometric distortion is a significant artifact in echo planar imaging (EPI), particularly along the phase-encode direction, due to low effective bandwidth.
  • This distortion arises from field inhomogeneities and can impede accurate image interpretation.

Purpose of the Study:

  • To present and validate a method for correcting in-plane image distortion in spin-echo echo planar imaging (SE-EPI).
  • To address geometric distortions specifically along the phase-encode direction.

Main Methods:

  • Implementation of a view angle tilting (VAT) imaging technique within SE-EPI.
  • Concurrent application of gradient blips in the slice-select and phase-encode directions to generate an offsetting phase.
  • Utilizing this generated phase to counteract phase accumulation from field inhomogeneity.

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Main Results:

  • Successful correction of in-plane image distortion along the phase-encode direction.
  • Demonstrated efficacy in both phantom studies and in vivo human brain imaging.
  • The VAT technique requires no additional scan time and is simple to implement.

Conclusions:

  • Spin-echo echo planar imaging with view angle tilting is an effective and practical method for correcting geometric distortion.
  • The technique is readily applicable on commercial MRI scanners without custom postprocessing.
  • This advancement improves the reliability of EPI for diagnostic and research purposes.