Table 1.

Sound speed and attenuation and acoustic backscatter coefficient (mean ±SD)

		Normal liver	Cirrhotic liver
Sound speed (m/s)		1577 ± 7	1631 ± 5
Attenuation	α1	0.121 ± 0.045	0.082 ± 0.023
(dB/mm)	α35	3.0 ± 0.6	4.1 ± 0.8
	m	0.9	1.1
Backscatter coefficient	μ1	2.66 × 10-6 ± 1.43 ×10-6	4.85 × 10-6 ± 1.52 ×10-6
(1/Srmm)	μ35	0.00303 ± 0.00015	0.0043 ± 0.00025
	n	1.98	1.91