Figure 8.

Simulation results. (a) PA signals simulated by our simulation method in the absence of the skull tissue for two different diameters of spherical absorber 2 mm (dotted line) and 0.2 mm (solid line). The setup in Figure 2 with the parameters, h = 0 mm (i.e., without skull), d = 2.7 cm, k = 10 mm, $r_0$ = 1 mm or 0.1 mm, $r_d$ = 0.025 inch, and T = 5 cm is used. (b) Corresponding normalized magnitude of the frequency spectrum of the simulated PA signals.