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Related Experiment Videos

Velocity profiles in stenosed models using magnetic resonance imaging.

S E Rittgers1, D Y Fei, K A Kraft

  • 1Department of Biomedical Engineering, University of Akron, Ohio.

Monographs on Atherosclerosis
|January 1, 1990
PubMed
Summary

Time-of-flight MRI accurately measures velocities in constricted blood flow models, detecting flow patterns near stenosis. However, it cannot yet detect all regions of disturbed flow downstream of the constriction.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Fluid Dynamics

Background:

  • Accurate velocity measurement is crucial for understanding blood flow dynamics in stenotic conditions.
  • Magnetic Resonance Imaging (MRI) offers a non-invasive approach to assess blood flow.
  • Time-of-flight (TOF) MRI is a technique for velocity quantification.

Purpose of the Study:

  • To evaluate the accuracy of a time-of-flight MRI velocity measurement technique.
  • To compare TOF MRI measurements with Laser Doppler Velocimetry (LDV) in a controlled model.
  • To assess the capability of TOF MRI in detecting specific flow phenomena in stenotic models.

Main Methods:

  • Utilized a constriction tube model simulating physiological flow conditions.
  • Acquired time-of-flight MRI displacement images.

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  • Performed simultaneous Laser Doppler Velocimetry (LDV) measurements for validation.
  • Analyzed data across a range of flow rates and stenosis severities.

    • Main Results:

    • TOF MRI successfully generated images in both laminar and turbulent flow jets (Re up to ~4,200).
    • The technique accurately measured mean jet velocities up to 172 cm/s.
    • Low forward and reverse velocity regions near the tube wall downstream of stenosis were detectable.
    • Regions of disturbed flow between jet termination and laminar re-establishment were not detectable.

    Conclusions:

    • Time-of-flight MRI is a viable technique for measuring velocities in stenotic flow models.
    • The method can identify key flow features, including recirculation zones.
    • Further advancements are needed to detect the full spectrum of disturbed flow patterns post-stenosis.