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Related Experiment Videos

Myocardial wall tagging with undersampled projection reconstruction.

D C Peters1, F H Epstein, E R McVeigh

  • 1Laboratory of Cardiac Energetics, National Institutes of Health, Bethesda, Maryland 20892-1061, USA. petersd@nih.gov

Magnetic Resonance in Medicine
|April 3, 2001
PubMed
Summary

Projection reconstruction (PR) magnetic resonance imaging (MRI) can speed up myocardial wall tagging scans by reducing the number of projections needed. This study investigates PR undersampling artifacts for improved cardiac motion measurement.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Cardiac Imaging
  • Biomedical Engineering

Background:

  • Myocardial wall tagging is crucial for assessing cardiac motion.
  • Traditional Fourier transform imaging requires extensive data acquisition for high-resolution tagging grids.
  • Faster imaging techniques are needed to improve temporal and spatial resolution in cardiac MRI.

Purpose of the Study:

  • To investigate azimuthally undersampled projection reconstruction (PR) for myocardial wall tagging.
  • To evaluate the trade-offs between scan time reduction and image artifacts in PR.
  • To provide insights into PR undersampling artifacts for accurate myocardial motion measurement.

Main Methods:

  • Utilized projection reconstruction (PR) acquisition with grid tags.

Related Experiment Videos

  • Compared PR requirements with Fourier transform imaging for tagging grids.
  • Analyzed PR undersampling artifacts in the context of myocardial motion measurement.

    • Main Results:

    • PR imaging requires approximately 80 projections, a 1.4-fold reduction compared to Fourier transform imaging (which needs at least 112 phase-encodings for 7-pixel spaced grids).
    • PR can achieve high-resolution images necessary for tagging with significantly fewer projections.
    • PR acquisition introduces artifacts that need to be understood for accurate motion analysis.

    Conclusions:

    • Azimuthally undersampled PR is a viable method for myocardial wall tagging, offering reduced scan times.
    • Understanding and characterizing PR undersampling artifacts is essential for reliable myocardial motion quantification.
    • PR holds promise for improving temporal and spatial resolution in cardiac MRI tagging.