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RARE spiral T2-weighted imaging

W Block1, J Pauly, D Nishimura

  • 1Department of Electrical Engineering, Stanford University, Stanford, California 94305-4055, USA.

Magnetic Resonance in Medicine
|April 1, 1997
PubMed
Summary
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This study introduces a novel RARE spiral imaging technique combining spiral trajectories with RARE echo trains to reduce blurring from magnetic field inhomogeneity. This method enables fast, high-quality imaging within breath-hold periods.

Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Spiral imaging offers efficient gradient hardware use for fast MRI.
  • Magnetic field inhomogeneity causes blurring proportional to data acquisition duration.

Purpose of the Study:

  • To combine spiral data acquisition with a RARE echo train to limit inhomogeneity-induced blurring.
  • To enable long data acquisition intervals per excitation while maintaining image quality.

Main Methods:

  • Partitioning long spiral k-space trajectories into smaller annular rings.
  • Acquiring annular rings during echoes of a RARE echo train with refocusing radiofrequency pulses.
  • Utilizing a multifrequency reconstruction algorithm with signal averaging for field map creation.

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Main Results:

  • Developed T2-weighted single excitation and interleaved RARE spiral sequences.
  • Achieved complete data acquisition in three excitations (32 cm FOV, 192x192 matrix).
  • Demonstrated 14-second multi-slice breath-hold scans with high signal-to-noise ratio (SNR) efficiency.

Conclusions:

  • The RARE spiral technique effectively mitigates inhomogeneity-induced blurring in fast MRI.
  • This method allows for efficient, high-quality imaging within practical breath-hold times.
  • The approach is compatible with conventional gradient systems and enhances SNR without significant scan time penalty.