TABLE 5.
Critical structure dose statistics for eight trigeminal neuralgia (TGN) patients (equally split between left and right‐sided conditions) planned using the virtual cone and a physical, 5‐mm stereotactic cone. For each patient, both types of the plan were calculated using the same isocenter and the same dose prescription, 90 Gy to the maximum dose
| Physical cone (5 mm, 6‐MV FFF) | Maximum | Minimum | Mean | Standard deviation | Planning constraint |
|---|---|---|---|---|---|
| MU | 20 668 | 18 927 | 19 771 | 572 | ‐ |
| Brainstem maximum dose (Gy) | 24.97 | 23.25 | 24.11 | 0.55 | <25 |
| Brainstem D0.5cc (Gy) | 5.54 | 4.12 | 4.94 | 0.44 | <10 |
|
Brainstem D0.1cc (Gy) |
10.23 | 8.40 | 9.55 | 0.67 | <12 |
| Brain V10Gy (cc) | 1.11 | 0.73 | 0.87 | 0.12 | <10 |
|
Optic nerve maximum dose (Gy) |
0.08 | 0.01 | 0.05 | 0.02 | <10 |
|
Inner ear maximum dose (Gy) |
0.70 | 0.06 | 0.24 | 0.22 | <12 |
| Virtual cone (10‐MV FFF) | Maximum | Minimum | Mean | Standard deviation | Planning constraint |
|---|---|---|---|---|---|
| MU | 31 340 | 29 300 | 30 196 | 602 | ‐ |
| Brainstem maximum dose (Gy) | 22.68 | 18.75 | 22.00 | 1.33 | <25 |
| Brainstem D0.5cc (Gy) | 6.74 | 6.33 | 6.48 | 0.15 | <10 |
| Brainstem D0.1cc (Gy) | 11.82 | 10.58 | 11.24 | 0.38 | <12 |
| Brain V10Gy (cc) | 1.50 | 1.06 | 1.24 | 0.15 | <10 |
| Optic nerve maximum Dose (Gy) | 1.24 | 0.54 | 0.84 | 0.23 | <10 |
| Inner Ear maximum Dose (Gy) | 4.10 | 2.99 | 3.36 | 0.36 | <12 |