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Related Experiment Video

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Arterial Stiffness Estimation by Shear Wave Elastography: Validation in Phantoms with Mechanical Testing.

Elira Maksuti1, Erik Widman1, David Larsson2

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

Ultrasound in Medicine & Biology
|October 12, 2015
PubMed
Summary

Shear wave elastography (SWE) can accurately measure arterial stiffness. Phase velocity analysis in SWE closely matches mechanical testing results for arterial stiffness, unlike group velocity methods.

Keywords:
AccuracyArterial phantomArterial stiffnessGroup velocityLamb wavesMechanical testingPhase velocityPoly(vinyl alcohol)Shear modulusShear wave elastography

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Medical Imaging

Background:

  • Arterial stiffness is a key indicator of cardiovascular disease risk.
  • Shear wave elastography (SWE) shows potential for quantifying arterial stiffness.
  • Previous assessments of SWE accuracy in arterial applications are lacking.

Purpose of the Study:

  • To assess the accuracy of SWE for measuring arterial stiffness.
  • To evaluate the influence of confined geometry on SWE shear modulus estimation.
  • To compare SWE measurements with mechanical testing in arterial phantoms.

Main Methods:

  • Utilized nine pressurized arterial phantoms.
  • Employed both group and phase velocity analysis for shear modulus estimation.
  • Compared SWE results against established mechanical testing data.

Main Results:

  • Group velocity analysis with infinite medium assumption yielded inaccurate shear modulus estimations (6.7 ± 0.0 kPa vs. 30.5 ± 0.4 kPa).
  • Phase velocity analysis in SWE demonstrated good agreement with mechanical testing (30.6 ± 3.2 kPa).
  • Relative error between phase velocity SWE and mechanical testing was 8.8 ± 6.0% within the 40-100 kPa range.

Conclusions:

  • SWE using phase velocity analysis accurately measures arterial stiffness in phantoms.
  • Phase velocity analysis is crucial for accurate SWE assessment of arterial stiffness, accounting for confined geometry.
  • Validated SWE as a reliable tool for assessing arterial stiffness, a critical cardiovascular disease marker.