The feasibility of using elastography for imaging the Poisson's ratio in porous media

Raffaella Righetti, Jonathan Ophir, Seshadri Srinivasan, Thomas A. Krouskop

Research output: Contribution to journalArticle

95 Scopus citations

Abstract

The feasibility of using elastography for experimentally estimating and imaging the Poisson's ratio of porous media under drained and undrained conditions was investigated. Using standard elastographic procedures, static and time-sequenced poroelastograms (strain ratio images) of homogeneous cylindrical gelatin and commercially available tofu samples were generated under sustained applied axial strain. The experimental data show similar trends to those that were observed in finite-elements simulations, and to those that were calculated from classical theoretical models proposed for biphasic materials with similar mechanical properties. To demonstrate the applicability of elastography to monitor time-dependent changes in nonhomogeneous porous structures as well, preliminary time-sequenced poroelastograms were obtained from two-layer porous phantoms and porcine muscle samples in vitro. The results suggest that elastography may have significant potential for quantitatively mapping the time-dependent mechanical behavior of poroelastic media, which is related to the dynamics of fluid flow and to the elasticity and permeability parameters of the media. (E-mail: Jonathan.Ophir@uth.tmc.edu)

Original languageEnglish (US)
Pages (from-to)215-228
Number of pages14
JournalUltrasound in Medicine and Biology
Volume30
Issue number2
DOIs
StatePublished - Feb 2004

Keywords

  • Edema
  • Elastography
  • Fluid dynamics
  • Imaging
  • Permeability
  • Poisson's ratio
  • Poroelastogram
  • Poroelastography
  • Porous media
  • Strain ratio
  • Tissue hydration
  • Ultrasound

ASJC Scopus subject areas

  • Biophysics
  • Radiological and Ultrasound Technology
  • Acoustics and Ultrasonics

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