Fig. 1.

2-D illustration of a simple model of numerical skull phantom used in our simulations. The initial pressure point source modeled as a sphere with the radius of $r_0$ at a depth of $d$ from the outer-skull surface. A single layer homogenized skull tissue with a thickness variation between 0.5 mm and 2.5 mm is considered. The solid acceptance angle of the transducer is indicated by the dashed lines.