TABLE IV.
Dose results and delivery efficiency for brain 1 and brain 2.
| Mean dose (Gy) | Maximum dosea (Gy) | PTV D99 (Gy) | Delivery efficiency | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Structure | 0.5 × 0.5 IMRT | 1 × 1 IMRT | IO-3D | 0.5 × 0.5 IMRT | 1 × 1 IMRT | IO-3D | 0.5 × 0.5 IMRT | 1 × 1 IMRT | IO-3D | 0.5 × 0.5 IMRT | 1 × 1 IMRT | IO-3D | |
| Brain 1 | |||||||||||||
| PTV1 | 59.7 | 59.6 | 59.9 | 62.7 | 62.8 | 62.9 | 55.6 | 56.0 | 55.6 | MU/Fx | 932 | 386 | 268 |
| PTV2 | 48.2 | 49.6 | 49.5 | 57.6 | 58.3 | 58.7 | 42.5 | 41.8 | 41.6 | Segments | 528 | 193 | 11 |
| Chiasm | 1.8 | 3.6 | 3.0 | 2.4 | 5.4 | 4.3 | — | — | — | Delivery time estimate (min) | 5.1 | 2.5 | 0.4 |
| R eye | 0.3 | 0.4 | 0.4 | 0.5 | 0.9 | 0.5 | — | — | — | ||||
| L eye | 0.3 | 0.4 | 0.4 | 0.5 | 0.8 | 0.5 | — | — | — | ||||
| Uninvolved brain | 13.6 | 15.0 | 15.1 | 48.0 | 45.1 | 48.5 | — | — | — | ||||
| Brain 2 | |||||||||||||
| PTV1 | 59.6 | 59.5 | 59.4 | 62.9 | 62.9 | 64.3 | 56.1 | 55.0 | 55.0 | MU/Fx | 1004 | 494 | 162 |
| PTV2 | 49.0 | 50.3 | 50.5 | 57.7 | 58.5 | 59.2 | 42.5 | 41.9 | 40.4 | Segments | 426 | 184 | 10 |
| Chiasm | 16.6 | 23.8 | 20.4 | 46.1 | 48.1 | 45.7 | — | — | — | Delivery time estimate (min) | 4.1 | 2.33 | 0.4 |
| R eye | 0.5 | 0.8 | 0.5 | 1.0 | 1.5 | 1.0 | — | — | — | ||||
| L eye | 1.3 | 1.9 | 5.0 | 5.3 | 8.3 | 16.2 | — | — | — | ||||
| L optic N | 20.5 | 26.0 | 24.0 | 45.4 | 49.1 | 47.6 | — | — | — | ||||
| Uninvolved brain | 9.1 | 10.0 | 13.0 | 62.0 | 63.0 | 64.5 | — | — | — | ||||
a
Maximum doses to 0.10 cc for optic structures and 0.50 cc for all other structures.