Liver | Phantom | |
---|---|---|
Density (kgm−3) | 1065 | 1044 |
Speed of sound (m s−1) | 1549 | 1544 |
Attenuation (Np cm−1MHz−1) | 0.049 | 0.009 – 0.021** |
Specific heat (J kg−1K−1) | 3600 | 4270* |
Lafon et al. [24] more recently found this value of specific heat [39] to be more accurate than 5100, as originally presented.
The attenuation slope for the phantom is given as 0.009 to 0.021Npcm−1MHz−1 for a range of BSA concentrations from 3 to 9%. Assuming a linear relationship exists between both factors, the following equation can be used for determining the attenuation at a set BSA concentration: