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Phase errors in multi-shot echo planar imaging

D A Feinberg1, K Oshio

  • 1New York University Medical Center, Radiology Department, New York 10016.

Magnetic Resonance in Medicine
|October 1, 1994
PubMed
Summary
This summary is machine-generated.

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This study visualizes magnetic field errors in multi-shot echo planar imaging (EPI) using k-space analysis. The echo time shift (ETS) technique reduces these phase errors by optimizing echo train positioning.

Area of Science:

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

Background:

  • Multi-shot echo planar imaging (EPI) is susceptible to phase errors caused by magnetic field inhomogeneity.
  • These errors degrade image quality and complicate quantitative analysis in EPI sequences.
  • Analyzing these errors in k-space offers direct visualization and insight into their spatial distribution.

Purpose of the Study:

  • To directly visualize and analyze field inhomogeneity related phase errors in multi-shot EPI.
  • To evaluate the effectiveness of the echo time shift (ETS) technique in mitigating these phase errors.
  • To improve the phase error function by optimizing echo train placement within k-space.

Main Methods:

  • Direct visualization and analysis of phase errors in the spatial frequency domain (k-space).

Related Experiment Videos

  • Implementation of the echo time shift (ETS) technique, which incrementally adjusts the echo train position.
  • Assessment of phase error redistribution away from the center of k-space using ETS.

    • Main Results:

    • Phase errors in multi-shot EPI were successfully visualized and analyzed in k-space.
    • The echo time shift (ETS) technique demonstrated an improvement in the phase error function.
    • Phase discontinuities were effectively redistributed away from the center of k-space, reducing their impact.

    Conclusions:

    • Direct k-space analysis provides valuable insights into field inhomogeneity in EPI.
    • The echo time shift (ETS) technique is an effective method for reducing phase errors in multi-shot EPI.
    • Optimizing echo train positioning via ETS enhances image quality and reliability in EPI.