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Related Experiment Video

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A Method to Study the Correlation Between Local Collagen Structure and Mechanical Properties of Atherosclerotic Plaque Fibrous Tissue
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Shear wave elastography plaque characterization with mechanical testing validation: a phantom study.

E Widman1, E Maksuti, D Larsson

  • 1Department of Medical Engineering, School of Technology and Health, KTH Royal Institute of Technology, 114 28 Stockholm, Sweden. Department of Molecular Medicine and Surgery, Karolinska Institutet, 17177 Solna, Sweden.

Physics in Medicine and Biology
|March 25, 2015
PubMed
Summary

Shear wave elastography (SWE) can now quantify atherosclerotic plaque stiffness. This non-invasive ultrasound technique accurately distinguishes hard and soft plaques, paving the way for improved patient treatment strategies.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Cardiovascular Research

Background:

  • Atherosclerotic plaque vulnerability assessment is crucial for treatment selection.
  • Current non-invasive ultrasound methods for plaque characterization rely on visual assessment, lacking quantitative accuracy.
  • Novel quantitative methods are needed for precise plaque characterization.

Purpose of the Study:

  • To evaluate the efficacy of shear wave elastography (SWE) in characterizing hard and soft plaque mimicking inclusions.
  • To validate SWE measurements against mechanical tensile testing.
  • To assess the feasibility of in vivo arterial plaque characterization using SWE.

Main Methods:

  • Six common carotid artery phantoms with hard and soft plaque inclusions were used.
  • Phase velocity analysis via SWE was performed in static and dynamic environments.
  • Measurements were validated using mechanical tensile testing.

Main Results:

  • SWE accurately measured shear moduli in both soft (5.8 ± 0.3 kPa) and hard (106.2 ± 17.2 kPa) plaques.
  • Results showed good agreement with mechanical testing (soft: 3.3 ± 0.5 Pa; hard: 98.3 ± 3.4 kPa).
  • SWE successfully measured plaque shear moduli during a simulated cardiac cycle.

Conclusions:

  • Shear wave elastography demonstrates high accuracy in characterizing plaque stiffness.
  • SWE shows potential as a non-invasive, quantitative tool for in vivo arterial plaque characterization.
  • This technique could significantly improve the selection of treatments for patients with atherosclerotic plaque.