. Author manuscript; available in PMC: 2013 Sep 11.

Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2010 Oct;57(10):2284–2292. doi: 10.1109/TUFFC.2010.1689

Table 4.

Ultrasonic propagation speeds and attenuation coefficients at 22°C for materials in phantom 2.

	BACKGROUND			SPHERES
FREQUENCY (MHz)	SPEED (m/s)	ATTEN COEFF (dB/cm)	ATTEN COEFF ÷ FREQUENCY (dB/cm/MHz)	SPEED (m/s)	ATTEN COEFF (dB/cm)	ATTEN COEFF ÷ FREQUENCY (dB/cm/MHz)
20	1540.2	9.82	0.49	1539.3	9.23	0.46
30	1541.9	16.72	0.56	1540.5	14.98	0.50
40	1542.2	26.27	0.66	1541.2	24.40	0.61
50	1543.1	37.60	0.75	1542.2	32.11	0.64