Table I.
Parameters used for fast and slow wave amplitudes, attenuation coefficients, and velocities. Parameter values reported by Nelson et al. (2011) correspond to data from Nagatani et al. (2008). Parameter values for human calcaneus (right column) correspond to mean values from Hoffman et al. (2012), in which numerical values for mean vfast and vslow were reported numerically and estimates for mean values for Afast, Aslow, βfast, and βslow may be estimated from Figures 6 and 5 (Hoffman et al., 2012).
| Reference | Nelson et al., 2011, Nagatani et al., 2008 | Anderson et al., 2010 | Hoffman et al., 2012 |
|---|---|---|---|
| Source | Bovine femur | Human femur | Human calcaneus |
| Center frequency f0 (MHz) | 1.0 | 0.5 | 0.5 |
| Thickness (mm) | 6,7,8,…,15 | 16.8 | 11.9 |
| Afast | 1.00 | 0.82 | 0.3 |
| Aslow | 0.13 | 0.23 | 0.6 |
| βfast (dB/cmMHz) | 49.2 | 42.8 | 4 |
| βslow (dB/cmMHz) | 7.1 | 5.2 | 4 |
| vfast (ω0) (m/s) | 1933 | 2036 | 1675 |
| vslow (ω0) (m/s) | 1475 | 1511 | 1527 |
| Separation (theory) | 0.38 – 0.95 | 0.56 | 0.13 |
| Separation (numerical) | 0.45 – 0.89 | 0.65 | 0.12 |
| Frequency Analysis Range (MHz) (flow − fhigh) | 0.25 – 1.6 | 0.2 – 0.8 | 0.2 – 0.8 |