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Related Experiment Videos

Single-shot GRASE imaging without fast gradients.

K Oshio1, D A Feinberg

  • 1Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115.

Magnetic Resonance in Medicine
|August 1, 1992
PubMed
Summary
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Gradient- and spin-echo (GRASE) imaging allows for longer acquisition periods by relying on T2 decay. An ultrafast GRASE sequence achieved a T2-weighted image in just 200 ms.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Development

Background:

  • Conventional echo-planar imaging (EPI) techniques are limited by T2* decay and phase errors.
  • Gradient- and spin-echo (GRASE) sequences offer potential for longer echo train lengths.

Purpose of the Study:

  • To develop and evaluate an ultrafast GRASE sequence for rapid T2-weighted imaging.
  • To demonstrate the feasibility of GRASE on unmodified commercial MRI scanners.

Main Methods:

  • Implementation of a GRASE sequence based on the Carr-Purcell-Meiboom-Gill (CPMG) method.
  • Utilizing a single excitation pulse to generate the echo train.
  • Acquisition of a 128 x 56 image matrix.

Main Results:

  • The GRASE echo train length is primarily limited by T2 decay, not T2* decay or phase errors.

Related Experiment Videos

  • An ultrafast GRASE sequence successfully generated a true T2-weighted image in 200 ms.
  • The sequence operated on a standard commercial scanner without requiring specialized hardware or fat suppression.

    • Conclusions:

    • Ultrafast GRASE imaging is a viable technique for rapid T2-weighted image acquisition.
    • GRASE offers advantages over EPI in terms of echo train length limitations.
    • This method holds promise for accelerating MRI scans without compromising image quality.