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Related Experiment Videos

Characterizing radial undersampling artifacts for cardiac applications.

Dana C Peters1, Pratik Rohatgi, René M Botnar

  • 1Beth Israel Deaconess Medical Center and Harvard Medical School, Department of Medicine, Cardiovascular Division, Boston, Massachusetts 02215, USA. dcpeters@bidmc.harvard.edu

Magnetic Resonance in Medicine
|January 13, 2006
PubMed
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Undersampled radial MRI accelerates cardiac imaging but can reduce quality. This study quantifies artifacts, finding they are generally low in the heart region and reproducible, aiding in optimizing scan parameters for better image quality.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Undersampled radial acquisition is common for accelerated cardiac MRI.
  • Image quality reduction due to undersampling is not well understood.
  • Quantifying artifacts is crucial for optimizing MRI protocols.

Purpose of the Study:

  • To develop and validate a method for measuring image quality artifacts in undersampled radial cardiac MRI.
  • To characterize the extent and distribution of artifacts in various cardiac views.
  • To establish artifact thresholds for acceptable image quality in coronary MRI.

Main Methods:

  • Synthetic undersampling of high signal-to-noise ratio (SNR) cardiac MRI images.
  • Validation of the artifact measurement method using phantoms.

Related Experiment Videos

  • Application to short-axis, long-axis, and coronary MRI in healthy subjects.

    • Main Results:

    • Total artifact was ~10% for short/long-axis (R=2.1) and ~15% for coronary MRI (R=3.7) with 60 projections.
    • Standard deviation of artifact in the heart region was 2% (short/long-axis) and 3.5% (coronary MRI).
    • Artifacts were lower in the heart region than peripherally and reproducible across subjects.

    Conclusions:

    • The developed method reliably quantifies undersampling artifacts in cardiac MRI.
    • Artifact levels are generally acceptable for standard cardiac views, especially within the heart region.
    • Coronary MRI requires more projections (N(p)>120, R=2.1) for acceptable image quality (artifact <6.5%).