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Related Experiment Videos

MR angiography using velocity-selective preparation pulses and segmented gradient-echo acquisition

F R Korosec1, T M Grist, J A Polzin

  • 1Department of Medical Physics, University of Wisconsin-Madison.

Magnetic Resonance in Medicine
|December 1, 1993
PubMed
Summary

This study introduces a cardiac-gated MR angiography technique using velocity-selective preparation (VSP) pulses. The method enhances blood vessel visualization by minimizing stationary tissue signals and reducing ghosting artifacts for clearer imaging.

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Area of Science:

  • Medical Imaging
  • Cardiovascular Imaging
  • Magnetic Resonance Imaging

Background:

  • Magnetic Resonance (MR) angiography is crucial for visualizing blood vessels.
  • Existing techniques face challenges with stationary tissue signals and motion artifacts.
  • Velocity-selective preparation (VSP) pulses offer potential for improved image contrast.

Purpose of the Study:

  • To develop and describe a novel cardiac-gated MR angiography method using VSP pulses.
  • To achieve images with minimal stationary tissue signal and velocity-dependent vessel intensity.
  • To produce ghost-free images of pulsatile blood flow.

Main Methods:

  • Employs velocity-selective preparation (VSP) pulses synchronized with the cardiac cycle.
  • Utilizes segmented gradient-echo acquisition with subtraction to remove residual signals.

Related Experiment Videos

  • Acquires multiple phase-encoding values per VSP pulse application.
  • Incorporates a delay between VSP pulse and data acquisition to mitigate signal loss.

    • Main Results:

    • Ideally produces images with no signal from stationary tissues.
    • Vessel signal intensity is dependent on blood velocity.
    • Achieves significant reduction in ghosting artifacts.
    • Enables visualization of blood in motion for short durations.
    • Allows for suppression of venous signal by tuning velocity sensitivity.

    Conclusions:

    • The described cardiac-gated MR angiography method with VSP pulses offers enhanced visualization of blood vessels.
    • Novel features, including subtraction and cardiac synchronization, improve image quality and reduce artifacts.
    • The technique provides a robust approach for cardiovascular imaging with improved signal-to-noise ratio and reduced motion sensitivity.