Fig. 3.

Mechanical wave propagation in a layer of nearly incompressible linear elastic medium bounded with water on the bottom [see Fig. 1(b)] simulated in OnScale. Spatial and temporal parameters of the push are $d=250\mu \mathrm{m}$ and $T=100\mu \mathrm{s}$, respectively; shear wave speed is $C_s=5\mathrm{m}/\mathrm{s}$ ($\mu =25\mathrm{kPa}$); layer thickness is $h=1\mathrm{mm}$. (a) XT plots (wave fields) calculated along the tissue surface and obtained for different signal bandwidths ($BW$) measured at $-6\mathrm{dB}$ cut-off so that ($BW*\frac{h}{C_s}=1,0.5,0.25,0.1$), respectively, for the rows from top to bottom. (b) The phase velocity dispersion computed from the wave fields of (a) red crosses, superimposed on the analytical solution⁵ (solid lines), respectively. (c) 2-D group velocity images normalized to the true shear wave speed (i.e., displayed value is 1 for a group velocity estimate equaling the true shear wave velocity) obtained for every point of the $XZ$ plane with the correlation method for the same $BW*\frac{h}{C_s}$ values, respectively.