TABLE 3.

Mass density and speed of sound of biological tissues were obtained from the literature (Goldman & Richards 1954; Goldman & Hueter 1956; Chivers & Parry 1978; Goss et al., 1978; 1980a,b; Goss & Dunn, 1980; Hoffmeister et al., 1995; Mast 2000; Haïat et al., 2006). The fluid bulk modulus K_f and tissue matrix modulus E_m were computed using equations 31 and 33 respectively, and corresponding data from Table 1 and 2.

Tissue	Mass density (Kg/m3)	Speed of Sound (m/s)	Fluid Bulk Modulus Kf (GPa)	Tissue Matrix Modulus Em (GPa)
Blood vessel		1500–1532	2.069	6.15
Brain	1040	1540–1580	1.541	6.90
Breast	1020	1490–1530	1.846	7.00
Cartilage		1565–1770	2.100	5.31
Eye, lens Eye, aqueous	1070 1010	1635–1655 1597–1518	2.045 2.250	7.00 4.44
Fat	0950	1468–1488	0.570	7.00
Heart	1060	1526–1623	1.727	6.49
Kidney	1050	1530–1590	1.854	6.72
Liver	1060	1555–1635	1.644	6.89
Muscle	1050	1517–1600	1.980	6.83
Skin	1090	1595–1635	2.028	6.59
Spleen	1054	1537–1597	2.069	6.85
Tendon	1130	1654–1852	2.133	4.20
Testis	1044	1556–1535	2.010	7.00
Tongue		1500–1600	1.235	7.00
Uterus		1589–1669	2.071	4.19
Bone, Cortical	1800–2200	3200–4000	0.225	18.00
Trabecular	400–1600	1500–2400	1.22–2.20	1.00–15.00
Tooth, dentin	2000–2200	3800–4200	0.20	19.00–25.00
Tooth, enamel	2840–3000	5000–5900	0.02	16.00–23.00