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Average intracranial and free field ultrasound beam dimensions for 0.12 MHz, 1.03 MHz and 2.00 MHz for N=3 (skulls 1, 4 and 5).
| Frequency (MHz) | Intracranial –3 dB beam width (mm) | Free field –3 dB beam width (mm) | Intracranial –3 dB depth of field (mm) | Free field –3 dB depth of field (mm) |
|---|---|---|---|---|
| 0.12 | 18.8 ± 4.9 | 23.4 ± 1.1 | 41.0 ± 7.8 | 91.2 ± 11.1 |
| 1.03 | 7.2 ± 1.6 | 7.2 ± 1.0 | 24.0 ± 1.7 | 45.3 ± 3.0 |
| 2.00 | 3.6 ± 0.5 | 3.1 ± 0.6 | 18.0 ± 4.0 | 18.0 ± 1.5 |
