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Interleaved asymmetric echo-planar imaging

F Hennel1, J F Nédélec

  • 1FORENAP, MR Centre, Rouffach, France.

Magnetic Resonance in Medicine
|October 1, 1995
PubMed
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This study introduces a novel interleaved echo-planar imaging (EPI) technique using single polarity readout gradients to eliminate ghosting artifacts. This method achieves high-resolution imaging rapidly on standard clinical equipment.

Area of Science:

  • Magnetic Resonance Imaging
  • Image Acquisition
  • Medical Physics

Background:

  • Ghosting artifacts in echo-planar imaging (EPI) can degrade image quality.
  • Traditional EPI methods often struggle to mitigate these artifacts effectively.

Purpose of the Study:

  • To present a modified interleaved EPI sequence that suppresses ghosting artifacts.
  • To explore phase encoding strategies for improved k-space trajectory control.

Main Methods:

  • Utilized a single polarity readout gradient during signal acquisition.
  • Investigated both blipped and constant phase encoding gradient methods.
  • Developed a modified reconstruction algorithm to correct for k-space shear distortion introduced by constant phase encoding.

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Main Results:

  • The proposed method effectively eliminates ghosting artifacts.
  • Achieved 128 x 128 resolution imaging in just 1 second.
  • Demonstrated feasibility on a clinical system with standard gradients.

Conclusions:

  • The single-polarity readout EPI technique offers a robust solution for artifact reduction.
  • This advancement enables faster, high-quality imaging in clinical settings.
  • The modified reconstruction algorithm successfully compensates for k-space distortions.