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The speed of sound (SOS) and thickness of the different media between the focal region of the MRgFUS device and the ultrasound imaging probe.
| Material | Thickness (mm) | SOS (m/s) | Absorption at 1 MHz (Np m−1) | Mean SOS (m/s) | |
|---|---|---|---|---|---|
| Quality assurance phantom | Phantom | 40 | 1528 | 53 (Ref. 64) | 1494 |
| Water | 90 | 1480 (at 19 °C) | 2.88 × 10−4 (Ref. 65) | ||
| Brain-mimicking phantom | Phantom | 32 | 1625 | 5.3 (attenuation) (Ref. 51) | 1552 |
| Skull | 3 | 3080 | 17.3–234.5 (Ref. 66) | ||
| Water | 95 | 1480 (at 19 °C) | 2.88 × 10−4 (Ref. 65) |
