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Related Experiment Videos

REST-PEEP: reduced scan time phase-encoded echo planar imaging.

David N Guilfoyle1, Jan Hrabe

  • 1Nathan Kline Institute, 140 Old Orangeburg Road, Orangeburg, NY 10962, USA. guilfoyl@nki.rfmh.org

NMR in Biomedicine
|December 4, 2003
PubMed
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This study introduces a novel echo planar imaging method combining speed and resolution. The new technique offers flexible trade-offs for improved magnetic resonance imaging acquisition.

Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Medical Physics

Background:

  • Echo planar imaging (EPI) enables rapid k-space acquisition in 3D.
  • Existing EPI sequences offer either speed or resolution, but not both.
  • Single-shot EPI methods (e.g., echo planar shift mapping, echo volume imaging) are fast but have poor spatial/spectral resolution.

Purpose of the Study:

  • To develop a novel EPI sequence combining two existing groups of sequences.
  • To enhance flexibility in balancing spectral bandwidth, signal-to-noise ratio, spatial resolution, and imaging time.
  • To present preliminary results for chemical shift imaging and 3D spatial imaging.

Main Methods:

  • A novel combination of single-RF excitation and repeated EPI acquisition sequences was developed.

Related Experiment Videos

  • The new method allows for flexible trade-offs between key imaging parameters.
  • Chemical shift imaging was optimized for N-acetyl aspartate (NAA) excitation.

    • Main Results:

    • Preliminary results demonstrate the feasibility of the combined EPI approach.
    • The method provides enhanced flexibility in optimizing imaging parameters.
    • A key finding is the transfer of the Nyquist ghost from the spectrum to the metabolite image.

    Conclusions:

    • The novel combined EPI sequence offers improved flexibility for MRI acquisition.
    • This approach allows for better optimization of speed, resolution, and signal-to-noise ratio.
    • The technique shows promise for advanced chemical shift and 3D spatial imaging.