TABLE I.

Parameters used in the simulations.

Speed of sound (m/s)		Absorption [dB (MHz cm)−1]		Density (kg/m3)
c water	1480	$\alpha \underset{\mathrm{skull},c}{min},\alpha \underset{\mathrm{skull},c}{max}$	0.64, 25.46	ρ bone	2200
c bone,c	3100	α brain	0.34	ρ brain	1030
c brain	1560	α water	2.5 × 10−5	ρ water	1000