Table 1.
Acoustic velocity, density, impedance, and attenuation coefficient of TMMs at 4.8 MHz (at room temperature 20 °C).
| Phantom | Acoustic velocity (m/s) | Density (103 kg/m3) | Impedance (Mrayl) | Attenuation coefficient (dB/cm/MHz) |
|---|---|---|---|---|
| 2% agar + 1%Al2O3 | 1519.19 ± 48.85 | 1.02 ± 0.02 | 1.55 ± 0.05 | 0.78 ± 0.04 |
| 3% agar + 1%Al2O3 | 1522.00 ± 40.18 | 1.03 ± 0.03 | 1.57 ± 0.07 | 0.61 ± 0.04 |
| 4% agar + 1%Al2O3 | 1534.65 ± 42.25 | 1.05 ± 0.01 | 1.61 ± 0.03 | 0.62 ± 0.03 |
| 5% agar + 1%Al2O3 | 1527.68 ± 57.11 | 1.06 ± 0.02 | 1.59 ± 0.08 | 0.50 ± 0.03 |
| PAA | 1468.96 ± 19.64 | 0.96 ± 0.05 | 1.42 ± 0.06 | 0.26 ± 0.04 |
| PAA + 2%Al2O3 | 1471.87 ± 32.03 | 1.01 ± 0.03 | 1.49 ± 0.05 | 0.70 ± 0.04 |
| Silicone | 1187.98 ± 38.55 | 0.98 ± 0.03 | 1.15 ± 0.08 | 4.09 ± 0.44 |