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Noninvasive vascular elastography: theoretical framework.

Roch L Maurice1, Jacques Ohayon, Yves Frétigny

  • 1Laboratory of Biorheology and Medical Ultrasonics, Research Center, University of Montreal Hospital, Montreal, Quebec H2L 2W5, Canada.

IEEE Transactions on Medical Imaging
|February 18, 2004
PubMed
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Ultrasound elastography can now noninvasively assess superficial artery elasticity. A new parameter, the Von Mises (VM) coefficient, overcomes imaging artifacts, enabling better characterization of vascular tissues like plaques and aneurysms.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Cardiovascular Research

Background:

  • Vessel wall elasticity changes indicate pathologies like plaque buildup and aneurysm risk.
  • Ultrasound elastography offers a noninvasive method to study vascular elasticity.

Purpose of the Study:

  • To introduce ultrasound elastography for noninvasive characterization of superficial arteries.
  • To address artifacts in elastograms caused by radial tissue motion and axial ultrasound propagation.
  • To propose the Von Mises (VM) coefficient as a novel parameter for accurate vessel wall characterization.

Main Methods:

  • Utilized a linear array ultrasound transducer on the skin over superficial arteries.
  • Computed elastograms from vascular tissue motion during cardiac pulsation.

Related Experiment Videos

  • Employed the Lagrangian estimator to obtain the 2D strain tensor for VM coefficient calculation.
  • Validated the theoretical model using biomechanical simulations of vascular wall properties.

    • Main Results:

    • Identified hardening and softening artifacts in elastograms due to motion-propagation mismatch.
    • Demonstrated the effectiveness of the Von Mises (VM) coefficient in circumventing these artifacts.
    • Showcased the method's potential to differentiate between hard plaques, lipid pools, and normal vascular tissue.

    Conclusions:

    • The proposed ultrasound elastography method with the VM coefficient shows promise for noninvasive vascular characterization.
    • Potential applications include in vivo assessment of abdominal aneurysms and superficial arteries (femoral, carotid).
    • This technique could improve the prediction of risks associated with vascular pathologies.