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Model-based complex shear modulus reconstruction: A Bayesian approach

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2 Author(s)
Orescanin, M. ; Dept. of Electr. & Comput. Eng., Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA ; Insana, M.F.

A narrow-band ultrasonic shear-wave imaging technique for estimating the complex shear modulus was applied to gelatin phantoms. This Bayesian approach incorporates the spatiotemporal geometry of shear waves radiating from a vibrating needle into a method for estimating modulus parameters. Compared to the phase gradient approach, this Bayesian method provides viscoelastic reconstructions for a single shear wave frequency. Estimates compare closely to results obtained using phase gradient method but with higher spectral resolution. We validated the assumption that the Kelvin-Voigt model, commonly applied in elasticity imaging situations, is representative of gelatin dispersion within the testing bandwidth between 50 and 450 Hz.

Published in:

Ultrasonics Symposium (IUS), 2010 IEEE

Date of Conference:

11-14 Oct. 2010