Is ultrasonic imaging a sensitive indicator of spatially varying elastic anisotropy?

Ch Kargel, B. Trummer, G. Plevnik, C. Pellot-Barakat, J. J. Mai, Michael Insana

Research output: Contribution to journalArticlepeer-review

Abstract

It has been conjectured that the mechanical structure of some early-forming neoplasms is anisotropic. If true then strain imaging at different scan angles may provide important diagnostic features for accurate classification of early malignant for sensing directionally dependent soft-tissue elastic properties. The studies include measurements and FEA models of gelatin phantoms and ex vivo bovine skeletal muscle. Passive muscle deformation is nonlinear, viscoelastic, and transverse isotropic, in stark contrast to the reference gelatin materials is that are isotropic, Hookean solids at very low cycling frequency. We found that for elastically heterogeneous tissue-like media, differences in elastic constants smaller than a factor of two were observed. However changes in directionally-dependent geometry and boundary conditions compete with material anisotropy and are difficult to distinguish. The role of strain imaging for detecting elastic anistropy depends on the separability of these effects.

Original languageEnglish (US)
Pages (from-to)1659-1662
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
Volume2
StatePublished - 2001
Externally publishedYes

Keywords

  • Anisotropy
  • Skeletal muscle
  • Strain imaging
  • Stress-strain curves

ASJC Scopus subject areas

  • Engineering(all)

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