Dynamic analysis of soft tissue viscoelasticity under ultrasonic radiation force using FEM

Megan L. Kogit, Baoxiang Shan, Assimina A. Pelegri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We have developed a solid mechanics model of nearly incompressible, viscoelastic soft tissue for finite element analysis (FEA) in MATLAB 7.2. Newmark's method was used to solve the finite element equations of motion for our model. The solution to our dynamic problem was validated with a transient dynamic analysis in ANSYS 10.0. We further demonstrated that our MATLAB FEA qualitatively agrees with those results observed with acoustic radiation force methods on soft tissues and tissue-mimicking materials. We showed that changes in Young's modulus and the damping coefficient affect the displacement amplitude and phase shift of the response data in the same manner: An increase in Young's modulus or damping coefficient decreases both the displacement amplitude and response lag. Future work on this project will involve frequency analysis on response data and studying the initial transient region to help uncouple the effects of Young's modulus and damping coefficient on response characteristics. This will get us one step closer to being able to explicitly determine Young's modulus and the damping coefficient from the temporal response data of acoustic radiation force methods, which is the ultimate goal of our project.

Original languageEnglish (US)
Title of host publicationBiomedical and Biotechnology Engineering
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages121-125
Number of pages5
ISBN (Electronic)0791842967
DOIs
StatePublished - 2007
EventASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007 - Seattle, United States
Duration: Nov 11 2007Nov 15 2007

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume2

Other

OtherASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007
Country/TerritoryUnited States
CitySeattle
Period11/11/0711/15/07

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Engineering(all)

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