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Partial discrete Fourier transform (PDFT) multiband encoding.

C H Cunningham1, J A Stainsby, G A Wright

  • 1Department of Medical Biophysics, University of Toronto, Ontario, Canada. cunning@sten.sunnybrook.utoronto.ca

Magnetic Resonance in Medicine
|January 9, 2001
PubMed
Summary
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A novel partial discrete Fourier transform (PDFT) encoding technique reduces MRI scan time by enabling simultaneous slice acquisition. This method offers a trade-off between signal-to-noise ratio (SNR) and imaging time without altering the number of slices.

Area of Science:

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

Background:

  • Conventional multiband encoding methods, like Hadamard encoding, exhibit scan times that increase linearly with the number of simultaneously encoded slices.
  • This linear scaling poses a limitation for accelerating MRI acquisition protocols requiring multiple slices.

Purpose of the Study:

  • To introduce and validate a new multiband encoding technique, partial discrete Fourier transform (PDFT) encoding, designed to overcome the linear scan time limitation.
  • To explore the theoretical basis, performance, and feasibility of PDFT encoding for accelerated MRI.

Main Methods:

  • Developed the theoretical framework for PDFT encoding, incorporating principles of partial Fourier imaging.
  • Investigated the sensitivity of PDFT encoding to phase errors through simulations.

Related Experiment Videos

  • Validated the technique using experimental excitation profile measurements and in vivo human heart imaging on commercial MRI equipment.

    • Main Results:

    • PDFT encoding allows for a trade-off between signal-to-noise ratio (SNR) and imaging time without changing the number of simultaneously acquired slices.
    • Simulations confirmed that phase errors in PDFT encoding lead to degraded slice localization.
    • Experimental results demonstrated a reduction in imaging time to 66% of conventional methods, with a corresponding reduction in SNR to 82% for 12 simultaneously encoded slices.

    Conclusions:

    • Partial discrete Fourier transform (PDFT) encoding offers a viable strategy for accelerating multiband MRI acquisition.
    • The technique successfully reduces imaging time while maintaining acceptable image quality, demonstrating its potential for clinical applications.
    • Understanding and mitigating phase errors is crucial for optimal performance of PDFT encoding.