Table 3.
Percent pressure reduction at the MCA origin and at the location of the maximum peak-to-peak pressure relative to the free field. Also listed are metrics for the degree of ultrasound field aberration. The dashes indicate that no measurement was performed because of a severely distorted field (non-collimated beam).
| Frequency (MHz) | Skull number | Percent pressure reduction at the MCA origin relative to the free field (%) | Percent pressure reduction at the position of maximum peak-to-peak pressure (%) | Relative position of maximum peak-to-peak pressure from the MCA origin (0,0,0) (mm) | Distance from the location of maximum peak-to-peak pressure from the MCA origin (mm) |
|---|---|---|---|---|---|
| 0.12 | 1 | 22.5 | 4.4 | (–2, –1, –5) | 5.5 |
| 2 | 41.9 | 14.2 | (–3,3, –22) | 22.4 | |
| 3 | 45.5 | 15.5 | (–4,5, –17) | 18.2 | |
| 4 | 23.0 | 0.9 | (–6, –3, –20) | 21.1 | |
| 5 | 32.8 | 8.0 | (–3,1, –19) | 19.3 | |
| 1.03 | 1 | 37.4 | 23.8 | (0, –3, –21) | 21.2 |
| 2 | 91.6 | -- | -- | -- | |
| 3 | 78.4 | -- | -- | -- | |
| 4 | 59.5 | 42.7 | (1, –2, –18) | 18.1 | |
| 5 | 56.5 | 45.6 | (–1, –4, –22) | 22.4 | |
| 2.00 | 1 | 80.4 | 69.0 | (1, –4, –14) | 14.6 |
| 2 | 96.6 | -- | -- | -- | |
| 3 | 92.1 | -- | -- | -- | |
| 4 | 86.0 | 75.8 | (1, –2, –19) | 19.1 | |
| 5 | 77.1 | 76.4 | (–1, –3, –20) | 20.2 | |