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High-order multiband encoding in the heart.

Charles H Cunningham1, Graham A Wright, Michael L Wood

  • 1Department of Medical Biophysics, University of Toronto and Sunnybrook and Women's College, Health Sciences Center, Canada. cunning@sten.sunnybrook.utoronto.ca

Magnetic Resonance in Medicine
|September 28, 2002
PubMed
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Researchers developed shorter radiofrequency (RF) pulses for multiband selective excitation, enabling imaging of more slices. This advancement reduces motion artifacts and improves practical applications in medical imaging.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Biomedical Engineering

Background:

  • Multiband selective excitation is limited by long radiofrequency (RF) pulse durations for more than eight slices.
  • Existing methods restrict the number of simultaneously encoded slices due to RF pulse length constraints.

Purpose of the Study:

  • To investigate techniques for shortening multiband RF pulses to enable encoding of a larger number of slices.
  • To develop and demonstrate a multiband technique for high-density slice imaging with adaptive slice thickness.

Main Methods:

  • Investigated techniques to shorten multiband RF pulses.
  • Developed a method for adaptive slice thickness with shortened pulses.
  • Performed simulations and experimental measurements, including excitation profiles for 32 contiguous slices.

Related Experiment Videos

  • Demonstrated the technique for coronary artery imaging.

    • Main Results:

    • Shortened RF pulses allow encoding of significantly more slices (e.g., 32 contiguous slices).
    • Reduced motion-induced excitation profile blurring and phase accrual were confirmed.
    • A tradeoff between slice thickness and pulse duration was established.
    • Demonstrated successful coronary artery imaging with 32 contiguous 2-mm slices.

    Conclusions:

    • Shortened RF pulses advance multiband encoding toward practical application by enabling high-density slice imaging.
    • The developed technique allows imaging of numerous contiguous slices with short RF pulses (1-2 ms).
    • Adaptive slice thickness capability is retained, enhancing flexibility in MRI applications.