Table 1.
Electrical and acoustic parameters for typical soft tissue*.
| F, GHz | L (m)Dry Skin | Ttr | Stress confinement time τs (μs) |
po (Pa) (Assuming pulse fluence = 1 J/m2) |
Maximum feasible pulse fluence consistent with stress confinement I0 τs (J/m2) (assuming Io = 10 MW/m2) | Peak acoustic frequency from RF pulse of duration τs, kHz | Peak acoustic pressure from RF pulse at maximum feasible fluence (kPa) (dB re 20 μPa) |
|---|---|---|---|---|---|---|---|
| 1 | 1.9E-02 | 0.45 | 13 | 5 | 130 | 12 | 0.3 (144 dB) |
| 3 | 9.4E-03 | 0.47 | 6 | 10 | 60 | 25 | 0.3 (144 dB) |
| 6 | 4.1E-03 | 0.48 | 3 | 23 | 30 | 58 | 0.3 (144 dB) |
| 10 | 1.9E-03 | 0.49 | 1 | 52 | 10 | 126 | 0.3 (144 dB) |
| 30 | 4.3E-04 | 0.54 | 0.3 | 253 | 3 | 560 | 0.4 (145 dB) |
| 100 | 1.8E-04 | 0.70 | 0.1 | 769 | 1 | 1,300 | 0.5 (147 dB) |
*Based on electrical parameters for dry skin (7).