Table 2.
Characteristics of pulmonary oligometastatic tumors and SBRT
| Irradiated oligometastatic tumors | Total number | 371 |
|---|---|---|
| SBRT date | 2004–09 | 143 (38.5%) |
| 2010–15 | 228 (61.4%) | |
| Maximum tumor diameter, cm | Median, range | 1.5, 0.5–5.3 |
| Located lobe | Upper or middle lobe | 143 (38.5%) |
| Lower lobe | 143 (38.5%) | |
| Missing | 85 (22.9%) | |
| Field coplanarity | Coplanar field | 102 (27.4%) |
| Non-coplanar field | 269 (72.5%) | |
| Beam | Static | 260 (70.0%) |
| Arc | 111 (29.9%) | |
| Dose prescription | Isocenter | 256 (69.0%) |
| D95 of PTVa | 79 (21.2%) | |
| Others | 36 (9.7) | |
| Calculation algorithm | A | 143 (38.5%) |
| Bb,* | 225 (60.6%) | |
| Missing | 3 (0.8%) | |
| Energy | 6 MV only | 300 (80.8%) |
| Others | 71 (19.1%) | |
| BED10 dose of IC, Gy | Median, range | 115.3, 75.0–289.5 |
| OTTc of SBRT, days | Median, range | 7, 3–61 |
aDose covering 95% of the planning target volume.
bType B calculation algorithm included superposition, equivalent algorithm or newer generation algorithm.
cOverall treatment time.