. Author manuscript; available in PMC: 2013 Oct 1.

Published in final edited form as: Ultrason Imaging. 2013 Apr;35(2):162–172. doi: 10.1177/0161734613478695

Table 1.

Attenuation Slopes for Samples Used in This Study.

			Estimated Attenuation Slope (dB/cm-MHz)
Phantom	Location	Attenuation Slope (dB/cm-MHz)	M	SD
Constant-BSC three-layer phantom	Top	0.47	0.50	0.08
	Middle	0.73	0.71	0.11
	Boundary	x	0.57	0.14
Constant attenuation three-layer phantom	Top	0.52	0.51	0.11
	Middle	0.54	0.54	0.12
	Boundary	x	0.01	0.44
Rodent phantom	Sphere	1.02	1.00	0.10
	Background	0.51	0.58	0.11
	Boundary	x	0.56	0.22
MAT tumor	Interior	0.71 ± 0.09	0.83	0.19

BSC = backscatter coefficient; MAT = mammary adenocarcinoma tumor. The x symbol is to indicate that there isn't an accepted attenuation slope for the boundary regions of the phantoms.