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Abbreviated moment-compensated phase encoding

G Cao1, D L Parker, D S Sherrill

  • 1Department of Radiology, University of Utah, Salt Lake City 84132, USA.

Magnetic Resonance in Medicine
|August 1, 1995
PubMed
Summary
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Abbreviated moment compensated phase-encoding (AMCPE) prevents vessel misregistration without long echo times. This technique offers effective flow compensation, minimizing artifacts for clear blood vessel imaging.

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Physics

Background:

  • Gradient moment nulling ensures accurate blood vessel spatial location.
  • However, it prolongs echo time (TE), potentially degrading complex flow images.
  • This necessitates alternative flow compensation methods.

Purpose of the Study:

  • To demonstrate the efficacy of abbreviated moment compensated phase-encoding (AMCPE) for blood vessel imaging.
  • To prevent spatial misregistration without extending echo time (TE).
  • To analyze the impact of partial flow compensation on image quality.

Main Methods:

  • AMCPE was developed to apply partial flow compensation to phase-encoding axes.
  • It defines k-space cutoff lines for complete and partial flow compensation.

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  • The technique was validated using flow phantoms, human volunteers, and computer simulations.

    • Main Results:

    • AMCPE successfully imaged blood flow correctly in both in vitro and in vivo studies.
    • Computer simulations showed ripple artifacts are unobservable when 60%-70% of k-space is fully compensated.
    • This confirms AMCPE's ability to maintain image quality.

    Conclusions:

    • AMCPE provides accurate spatial localization of blood vessels.
    • It avoids the need for long echo times associated with traditional methods.
    • AMCPE is a viable technique for improved blood flow imaging in MRI.