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Radial echo-planar imaging

A C Silva1, E L Barbier, I J Lowe

  • 1Pittsburgh NMR Center for Biomedical Research, Carnegie Mellon University, Pittsburgh, Pennsylvania, 15213, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|November 4, 1998
PubMed
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A new ultrafast magnetic resonance imaging technique, radial echo-planar imaging (rEPI), offers EPI speed with radial sampling benefits. This advanced MRI method shows reduced sensitivity to off-resonance effects, enhancing image quality.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Biophysics

Background:

  • Echo-planar imaging (EPI) is a fast MRI technique.
  • Radial sampling offers benefits for image reconstruction.
  • Combining speed and radial benefits presents a challenge.

Purpose of the Study:

  • Introduce a novel ultrafast MRI pulse sequence: radial echo-planar imaging (rEPI).
  • Evaluate rEPI's ability to merge EPI speed with radial sampling advantages.
  • Assess rEPI's performance regarding speed, signal-to-noise ratio, and off-resonance effects.

Main Methods:

  • Modified EPI sequence to acquire k-space data radially.
  • Incremental rotation of the readout gradient for refocusing echoes at k-space center.

Related Experiment Videos

  • Polar grid data acquisition with reconstruction via filtered back-projection or regridding and 2D Fourier Transform.

    • Main Results:

    • rEPI achieves comparable speed and signal-to-noise ratio to conventional EPI.
    • rEPI demonstrates reduced sensitivity to off-resonance artifacts compared to EPI.
    • Initial results indicate the potential for high-quality ultrafast MRI acquisition.

    Conclusions:

    • rEPI is a promising ultrafast MRI technique.
    • rEPI offers a viable alternative to EPI, with improved robustness to off-resonance effects.
    • Further research will explore rEPI's utility in spectroscopic imaging and motion-affected applications.