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Related Experiment Videos

MR angiography with a cardiac-phase--specific acquisition window.

K Selby1, D Saloner, C M Anderson

  • 1Department of Radiology, University of California, San Francisco.

Journal of Magnetic Resonance Imaging : JMRI
|November 1, 1992
PubMed
Summary

This study introduces cardiac-phase-specific magnetic resonance (MR) angiography, enhancing imaging speed and clarity. By acquiring data only during systole, it improves signal intensity and eliminates artifacts for better lower extremity MR angiograms.

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Area of Science:

  • Cardiovascular Imaging
  • Magnetic Resonance Imaging (MRI)
  • Medical Technology

Background:

  • Traditional Magnetic Resonance (MR) angiography faces challenges with motion artifacts and long acquisition times.
  • Optimizing data acquisition within specific cardiac phases is crucial for improving image quality and reducing scan duration.
  • Stationary tissue suppression and vessel/background contrast are key factors in diagnostic MR angiography.

Purpose of the Study:

  • To develop and evaluate a cardiac-phase-specific MR angiography method.
  • To improve signal intensity of flowing blood and reduce artifacts in MR angiograms.
  • To minimize image acquisition time for enhanced lower extremity MR angiography.

Main Methods:

  • Implementation of an electronics module for phase-encoding gradient incrementing and data storage during a selected cardiac cycle portion (systole).

Related Experiment Videos

  • Maintenance of stationary material suppression using radio-frequency pulses at a constant repetition time (TR) throughout the cardiac cycle.
  • Acquisition of only low-frequency phase-encoding lines in the cardiac-phase-specific mode to minimize imaging time.

    • Main Results:

    • Imaging of a pulsatile flow phantom showed substantially increased signal intensity of flowing material when data acquisition was limited to systole.
    • Elimination of phase-encoding ghost artifacts in the vicinity of vessels was observed.
    • Significantly improved MR angiograms of the lower extremities were obtained in healthy volunteers, with enhanced vessel/background contrast using fat saturation and magnetization transfer.

    Conclusions:

    • Cardiac-phase-specific MR angiography, particularly data acquisition during systole, substantially increases signal intensity and eliminates artifacts.
    • This method significantly reduces total acquisition time by optimizing data acquisition, enabling near-longitudinal section orientation without in-plane saturation.
    • The technique offers a substantial improvement for lower extremity MR angiography, enhancing diagnostic capabilities.