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. Author manuscript; available in PMC: 2013 May 30.
Published in final edited form as: Ultrason Imaging. 2012 Oct;34(4):209–221. doi: 10.1177/0161734612464451

Table 5.

Percent Error (Magnitude) of the Slope of the Attenuation Coefficient versus Frequency for Each Layer of the Const-α Phantom and Const-BSC Phantom

Proximal Layer
(% error)
 Mid Layer
(% error)
 Distal Layer
(% error)
Clinical System Transducer Const-α Const-BSC Const-α Const-BSC Const-α Const-BSC
UltraSonix RP L14-5/38 −11.5 −4.2 −11.1 −12.3 −40.4 −12.8
Siemens Acuson
 S2000		 18L6 −7.7 0 −1.8 −2.7 −15.4 −8.5
9L4 −5.8 4.2 −3.7 −4.1 5.8 −4.2
VisualSonics
 Vevo 2100		 MS200 1.9 −6.4 1.8 −5.5 28.8 4.2

Const-α = constant attenuation; Const-BSC = constant backscatter. The layers are identified (“proximal,” “mid,” and “distal”) according to their position with respect to the transducer during scanning.