Homogenous shear modulus reconstruction at multiple frequencies using the DICE method

Abstract

The non-invasive technique of Digital Image Correlation Elastography was used to estimate the viscoelastic properties of a tissue-mimicking silicone phantom. Harmonic motion fields were generated over a frequency range of 40–90 ​Hz and measured at the phantom surface by 4 stereoscopic camera pairs. The storage modulus (G’) and the loss modulus (G”) were successfully reconstructed from the measured surface displacement data. Low variations were found for repeated measurements and the frequency dependent viscoelastic behavior was highly consistent across multiple excitation waveforms. Power-law analysis of the two viscoelastic properties provided exponent terms consistent with tissue-like materials.

Keywords

• Elastography
• Visco-elastic
• DICE