Table 3.
Dosimetric comparison of photon-based SBRT and proton-based SBRT therapy plans
| Characteristic | Photon-based SBRT plan | Proton-based SBRT plan | p Value |
|---|---|---|---|
| median (range) | median (range) | ||
| PTV | |||
| Percentage coverage | 96 (95 to 99) | 97 (95 to 99) | |
| Chest wall (cm3) | |||
| V20 | 364.0 (240.0 to 511.5) | 160.0 (5.0 to 253.0) | < 0.0001 |
| V30 | 144.6 (82.3 to 238.5) | 77.0 (30.3 to 111.4) | 0.0012 |
| V35 | 93.9 (54.8 to 167.7) | 57.9 (21.3 to 93.6) | 0.0054 |
| V40 | 66.5 (36.9 to 123.1) | 45.4 (15.1 to 78.5) | 0.0112 |
| Lung | |||
| Mean dose (Gy) | 57.5 (38.0 to 80.2) | 38.8 (29.0 to 44.9) | 0.0001 |
| V10 (cm3) | 17.5 (11.0 to 29.0) | 12.7 (9.2 to 16.0) | 0.0010 |