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Artifacts from pulsatile flow in MR imaging.

W H Perman, P R Moran, R A Moran

    Journal of Computer Assisted Tomography
    |May 1, 1986
    PubMed
    Summary
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    Pulsatile blood flow creates unique bright and dark "ghosting" artifacts in magnetic resonance imaging (MRI). This study characterizes these flow artifacts and explains their origin from accidental velocity-encodings in MRI sequences.

    Area of Science:

    • Medical Imaging
    • Biophysics
    • Cardiovascular Science

    Background:

    • Previous research explored blood flow's impact on blood vessel signal intensity, noting brightening and darkening effects.
    • Flow artifacts in magnetic resonance imaging (MRI) can arise from various sources, including patient motion and blood flow dynamics.

    Purpose of the Study:

    • To investigate a specific type of flow artifact originating from the pulsatile nature of blood flow.
    • To characterize the features of these pulsatile flow artifacts and their appearance in MRI.
    • To develop a theoretical explanation for the origin of these artifacts.

    Main Methods:

    • Analysis of characteristic bright and dark "ghosting" patterns near small vessels, particularly arteries.
    • Comparison of pulsatile flow artifacts to motion-induced artifacts, characterizing them as frequency-modulated spectral sidebands.

    Related Experiment Videos

  • Theoretical modeling of artifact origins, linking them to "accidental" velocity-encodings in MRI sequences.

    • Main Results:

    • Pulsatile blood flow generates distinct bright and dark ghosting artifacts adjacent to vessels.
    • These artifacts are analogous to motion artifacts and can be described as frequency-modulated spectral sidebands.
    • The study identifies "accidental" velocity-encodings within common MRI sequences as the primary cause of these pulsatile flow artifacts.

    Conclusions:

    • Pulsatile blood flow is a significant source of artifacts in MRI, manifesting as ghosting patterns.
    • Understanding these artifacts is crucial for accurate interpretation of MRI scans, especially in vascular imaging.
    • The theoretical framework provided elucidates the mechanism of pulsatile flow artifacts, aiding in artifact reduction strategies.