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Phase-contrast with interleaved undersampled projections.

A V Barger1, D C Peters, W F Block

  • 1Department of Physics, University of Wisconsin, Madison, Wisconsin, USA. abarger@mr.radiology.wisc.edu

Magnetic Resonance in Medicine
|April 5, 2000
PubMed
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Undersampled projection reconstruction significantly speeds up Magnetic Resonance (MR) phase-contrast imaging. This technique reduces scan times by two to four times for 3D datasets, enabling faster flow measurements.

Area of Science:

  • Medical Imaging
  • Biophysics
  • Cardiovascular Imaging

Background:

  • Phase-contrast Magnetic Resonance (MR) imaging offers valuable flow quantification and velocity-sensitive angiograms.
  • Current MR phase-contrast techniques are limited by lengthy acquisition times, hindering clinical application.
  • Undersampled projection reconstruction (UPR) has shown promise in accelerating MR angiography.

Purpose of the Study:

  • To investigate the potential of UPR for accelerating phase-contrast MR imaging acquisitions.
  • To develop and evaluate an UPR acquisition scheme for 3D phase-contrast imaging.
  • To assess the reduction in scan times achievable with UPR in phase-contrast MR.

Main Methods:

  • Developed a novel acquisition scheme using UPR with projection trajectories.

Related Experiment Videos

  • Incorporated flow sensitization gradients to encode velocity information.
  • Acquired three flow-encoding directions on angular-interleaved projections for 3D datasets.

    • Main Results:

    • UPR demonstrates potential for phase-contrast acquisitions, similar to its success in contrast-enhanced MR angiography.
    • The proposed scheme enables acquisition of velocity-dependent phase information.
    • Achieved reduction in acquisition times for 3D datasets by factors of two to four, depending on resolution.

    Conclusions:

    • UPR can significantly accelerate 3D phase-contrast MR imaging.
    • This acceleration allows for faster quantitative flow measurements and velocity-sensitive angiograms.
    • The technique holds promise for improving the efficiency of cardiovascular MR examinations.