Table 1.

Acoustic parameters

Speed of sound (m s−1)	Density (kg m−3)	Absorption (Np MHz−1 m−1)
c water = 1482	ρwater = 1000	αwater = 3.48e‐4
c bone,c = 3100	ρbone = 2200	αmin,skull,c = 21.5
c bulk = 2850	ρbulk = 1732	αmax,skull,c = 208.9
		αbulk = 85.0