Table 3.
Radiation parameters for brain metastasis
| Variable | Patients n – 62 (%) |
|---|---|
| PTV (median, range) | 67.1 cc (23.4–112.6) |
| Dose (BED α/β = 10) (median, range) | 37.5 Gy (28–59.5) |
| All radiation dosage regimen | |
| Total dose (Gy), n of fraction (BED α/β = 10) | |
| 24 Gy,3 (43.2) | 4 (6.4%) |
| 24 Gy,4 (38.4) | 1 (1.6%) |
| 20 Gy,4 (30) | 3 (4.8%) |
| 25 Gy,5 (37.5) | 32 (51.6%) |
| 27.5 Gy,5 (42.6) | 6 (9.6%) |
| 30 Gy,5 (48) | 11 (17.7%) |
| 32.5 Gy,5 (53.3) | 2 (3.2%) |
| 30 Gy,6 (45) | 2 (3.2%) |
| 35 Gy,7 (59.5) | 1 (1.6%) |
| Dose > 40 Gy | 38.8% |
| Inclusion of corridor in PTV | 79% |
| En bloc resection | 87% |
| Days from surgery to RT (median, range) | 28.5 (16–44) |
| > 28 days from RT | 50% |
| BrainV25 (Brain-PTV) (median, range) | 4.4 cc(0–9.1 cc) |
PTV- Planning treatment volume, BED—Biologically Effective Dose