Fig. 6.

The numerical simulation of the heterogeneous phantom with standard cases to demonstrate the boundary behavior. (a) and (b) are the illustration of the heterogeneous phantom with the ARF excitation on stiff material (8%) and soft material (3%), respectively. The distance between the excitation and boundary is approximately 2.5 mm. (c) and (d) represent the wave propagations in 3D-OCT (x, y, t) with the excitation on 8% and on 3%, respectively, and the depth of the 2D wave fields is approximately at 1 mm under the surface of the phantom. (e) The numerical simulation of the heterogeneous phantom with the excitation on 8% and (f) on 3% gelatin.