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Parametric Sequential Method for MRI-Based Wall Shear Stress Quantification.

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    |December 21, 2020
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    This study validates a new method for estimating wall shear stress (WSS) using phase-contrast MRI. The technique shows promise for assessing cardiovascular disease biomarkers from blood flow measurements.

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    Area of Science:

    • Cardiovascular imaging
    • Biomedical engineering
    • Fluid dynamics

    Background:

    • Wall shear stress (WSS) is a crucial factor in cardiovascular health.
    • Estimating WSS is vital for diagnosing and managing cardiovascular diseases.
    • Phase-contrast Magnetic Resonance Imaging (PC-MRI) offers a non-invasive method for velocity measurement.

    Purpose of the Study:

    • To present and validate a parametric sequential method for MRI-based WSS quantification.
    • To assess the accuracy of the method using controlled in vitro flow measurements.
    • To evaluate the preliminary applicability of the method for in vivo cardiovascular applications.

    Main Methods:

    • Developed a parametric sequential method for WSS quantification from PC-MRI data.
    • Included geometry identification and velocity field approximation steps.
    • Validated the method with high-resolution in vitro measurements of turbulent and pulsatile flows in phantoms.

    Main Results:

    • The method demonstrated accurate WSS estimation in controlled in vitro flow conditions.
    • Successful application to in vivo 2D PC-MRI data from the ascending aorta of volunteers.
    • Initial tests indicate the method's basic applicability for in vivo cardiovascular studies.

    Conclusions:

    • The presented parametric sequential method offers a viable approach for MRI-based WSS quantification.
    • Validation in vitro and preliminary in vivo results support its potential as a cardiovascular biomarker tool.
    • Further research is warranted to fully establish its clinical utility in cardiovascular disease assessment.