Journal of Biomechanics
Volume 39, Issue 8 , Pages 1428-1434, 2006

Differential effects of pre-tension on shear wave propagation in elastic media with different boundary conditions as measured by magnetic resonance elastography and finite element modeling

  • Qingshan Chen

      Affiliations

    • Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic, Rochester, MN 55905, USA
  • ,
  • Stacie I. Ringleb

      Affiliations

    • Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic, Rochester, MN 55905, USA
  • ,
  • Armando Manduca

      Affiliations

    • Magnetic Resonance Research Laboratory, Mayo Clinic Rochester, MN 55905, USA
  • ,
  • Richard L. Ehman

      Affiliations

    • Magnetic Resonance Research Laboratory, Mayo Clinic Rochester, MN 55905, USA
  • ,
  • Kai-Nan An

      Affiliations

    • Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic, Rochester, MN 55905, USA
    • Corresponding Author InformationCorresponding author. Tel: 5075381717; fax: 5072845392.

Accepted 8 April 2005. published online 17 June 2005.

Abstract 

Magnetic resonance elastography (MRE) can non-invasively determine material stiffness based on the propagating shear wavelength. Shear wave propagation in a finite homogenous isotropic material can be affected by multiple factors. In this study we examined the effects of pre-tension and frequency on MRE shear measurements of gel phantoms with different boundary conditions, frequencies, and geometries. Results from MRE measurements were compared to wave motion theory in elastic solids and qualitatively to a finite element (FE) model. Results indicated that boundary conditions, geometry and pre-tension are important factors to be considered when performing MRE tests on a finite material, and that FE modeling can help explore how the shear wave propagation is affected under various boundary conditions and axial stresses, among other potential factors.

Keywords: Magnetic resonance elastography, Shear stiffness, Flexural wave, Finite element modeling, Boundary conditions

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PII: S0021-9290(05)00179-X

doi:10.1016/j.jbiomech.2005.04.009

Journal of Biomechanics
Volume 39, Issue 8 , Pages 1428-1434, 2006