Measurement of change in wall thickness of cylindrical shell due to cyclic remote actuation for assessment of viscoelasticity of arterial wall

Hideyuki Hasegawa, Hiroshi Kanai, Yoshiro Koiwa, James P. Butler

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

To characterize tissues in atherosclerotic plaques, we have developed a method, the phased tracking method, for measuring the strain (change in wall thickness) and elasticity of the arterial wall. However, some types of tissue, such as lipids and blood clots, cannot be discriminated from each other based only on elasticity because of the small difference in their elasticity. For more precise tissue characterization, we are attempting to measure the regional viscoelasticity. To determine viscoelastic properties, elastic moduli at multiple frequencies were obtained by generating the change in internal pressure due to remote cyclic actuation. From basic experiments using a silicone rubber tube, it was found that the change in internal pressure at the ultrasonic beam position (for measurement of the elastic modulus) can be generated by remotely applied actuation. Furthermore, from the resultant minute changes in wall thickness of less than 10 μm measured by the phased tracking method, elastic moduli were obtained at multiple actuation frequencies.

Original languageEnglish
Pages (from-to)3255-3261
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number5 B
DOIs
Publication statusPublished - 2003 May

Keywords

  • Atherosclerosis
  • Change in internal pressure
  • Frequency characteristics
  • Remote actuation
  • Small change in wall thickness
  • Viscoelasticity

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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