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Related Experiment Video

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Diffusion Imaging in the Rat Cervical Spinal Cord
10:46

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Published on: April 7, 2015

[Distortion in diffusion weighted imaging].

Mitsuyuki Takahashi1, Akio Ogura, Masanori Ozaki

  • 1Department of Radiology, Federation of National Public Service and Affiliated Personnel Mutual Aid Associations, Yokohama Sakae Kyousai Hospital.

Nihon Hoshasen Gijutsu Gakkai Zasshi
|December 19, 2009
PubMed
Summary

This study investigated echo planar imaging (EPI) distortion using chemical shift equations. Findings reveal a correlation between chemical shift and distortion, which increases with higher b values in diffusion-weighted imaging (DWI).

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Area of Science:

  • Magnetic Resonance Imaging
  • Image Analysis

Context:

  • Echo planar imaging (EPI) is susceptible to geometric distortions.
  • Diffusion-weighted imaging (DWI) is crucial for various neurological applications but can be affected by EPI distortions.

Purpose:

  • To examine the definitional equation of EPI distortion.
  • To compare measured and calculated chemical shift values to understand distortion.
  • To investigate the impact of b values on DWI distortion.

Summary:

  • The study validated the chemical shift equation for EPI distortion by comparing measured and calculated values.
  • A direct correlation between chemical shift and geometric distortion in EPI was established.
  • Image distortion in DWI increased with higher b values, attributed to eddy current effects from strong gradients.

Impact:

  • Provides a method to quantify and potentially correct EPI distortions.
  • Improves the accuracy of DWI analysis by understanding distortion dependencies.
  • Offers insights into mitigating artifacts in advanced MRI sequences.