AN IMPROVED ELASTIC AND VISCOSITY IMAGING METHOD USING SHEAR WAVE AND FDTD/AHI MODEL

Abstract

Shearwave viscoelasticity imaging is a quick and convenient imaging model
for collecting images of tissues. The mechanical properties of soft tissues
(elasticity, viscosity) are expressed through the complex shearwave modulus
(CSM) parameter, which is an useful information for tissue pathological
diagnosis. In this paper, we construct a shearwave propagation model in 2D
environment using the finite-difference time-domain (FDTD) method; then apply
the proposed bandpass filter to reduce the measured particle velocity noise of
the shearwave; Finally, we use the algebraic Helmholtz inversion (AHI) algorithm
to directly estimate CSM. The results of numerical simulation have proved the
effectiveness of the proposed algorithm.