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Related Experiment Videos

Double-sampled echo-planar imaging at 3 tesla

Q X Yang1, S Posse, D Le Bihan

  • 1Department of Radiology (Center for NMR Research), Pennsylvania State University, College of Medicine, Milton S. Hershey Medical Center, Hershey 17033, USA.

Journal of Magnetic Resonance. Series B
|November 1, 1996
PubMed
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The double-sampled echo-planar imaging (DSEPI) method effectively eliminates the Nyquist ghost artifact in MRI scans. This technique restores signal-to-noise ratio (SNR) loss, improving image quality for brain imaging.

Area of Science:

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

Background:

  • Echo-planar imaging (EPI) is susceptible to the Nyquist ghost artifact.
  • This artifact arises from time-reversal asymmetry in even and odd echoes.
  • The Nyquist ghost degrades image quality and reduces signal-to-noise ratio (SNR).

Purpose of the Study:

  • To present a novel method for eliminating the Nyquist ghost artifact in EPI.
  • To restore the signal-to-noise ratio (SNR) lost due to this artifact.
  • To validate the effectiveness of the proposed method in human brain imaging.

Main Methods:

  • Introduction of the double-sampled EPI (DSEPI) technique.
  • Equal phase encoding of even and odd echo pairs.

Related Experiment Videos

  • Separate reconstruction and addition of even and odd echo images.

    • Main Results:

    • Successful elimination of the Nyquist ghost artifact.
    • Restoration of image signal-to-noise ratio (SNR) loss.
    • Demonstration of the method's efficacy in 3.0 T human brain scans.

    Conclusions:

    • DSEPI is a simple and effective solution for Nyquist ghost artifact.
    • The method significantly improves image quality in EPI.
    • DSEPI is a valuable technique for neuroimaging applications.