Wave propagation in viscoelastic materials

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Mechanical‐wave stimulation/excitation is usually the key aspect that determines the quality of elasticity imaging. This chapter discusses the exogenous harmonic‐wave stimulation and its applications in estimating mechanical properties of elastic and viscoelastic media. It briefly summarizes the equations that describe local displacements associated with shear waves as a function of the spatially varying complex shear modulus. Cylindrical waves and surface waves are widely used to mechanically excite tissues. Wave speed in an elastic material is constant with frequency. In contrast, viscoelastic materials are dispersive; that is the wave speed changes substantially with frequency. Dispersive behavior is determined by the components of the materials and their mechanical couplings. In standard rheological models, these components are represented by springs and dash‐pots. Shear‐wave and surface‐wave imaging offer quantitative estimates of intrinsic viscoelastic properties of dispersive tissues. Coupling dispersion behavior with rheological models parameterizes measurements as needed for imaging.

Original languageEnglish (US)
Title of host publicationUltrasound Elastography for Biomedical Applications and Medicine
PublisherWiley
Pages118-127
Number of pages10
ISBN (Electronic)9781119021520
ISBN (Print)9781119021513
DOIs
StatePublished - Jan 1 2016

ASJC Scopus subject areas

  • Engineering(all)

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    Wang, Y., & Insana, M. F. (2016). Wave propagation in viscoelastic materials. In Ultrasound Elastography for Biomedical Applications and Medicine (pp. 118-127). Wiley. https://doi.org/10.1002/9781119021520.ch8