By Topic

Investigating the effects of viscosity on focused, impulsive, acoustic radiation force induced shear wave morphology

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
Wang, M.H. ; Dept. of Biomed. Eng., Duke Univ., Durham, NC ; Palmeri, M.L. ; Rouze, N.C. ; Nightingale, K.R.
more authors

The effect of dispersion on the morphology of impulsive acoustic radiation force induced shear waves propagating in viscoelastic (VE) media is investigated. Change in shear wave morphology was quantified by calculating its spatial coherence. The magnitude of the slope of the spatial coherence as a function of propagation distance, or decorrelation rate, was used to compare the VE behavior of different materials. Shear waves in VE media with a range of material properties were simulated using Finite Element Method (FEM) models and a three parameter standard linear solid model of viscoelasticity. Shear wave decorrelation rate increased with the amount of stress relaxation occurring within the temporal extent of the shear wave. Shear wave decorrelation rate can therefore be used to discriminate ranges of VE behavior. In experimental data collected using a modified Siemens AntaresTM scanner, the shear wave decorrelation rate was significantly higher for a VE phantom than one constructed of an elastic material. In preliminary in vivo human liver data, shear wave decorrelation was found to be present and variable among different patients. The relationship between liver viscosity as quantified by shear wave spatial coherence and disease states is being investigated.

Published in:

Ultrasonics Symposium, 2008. IUS 2008. IEEE

Date of Conference:

2-5 Nov. 2008