Table 2.
Plan Quality
| SRS Group | |
|---|---|
| Prescribed dose | |
| 1 × 16 Gy (BM in brainstem) | 3 (21%) |
| 1 × 18 Gy | 2 (14%) |
| 1 × 21 Gy | 4 (29%) |
| 1 × 24 Gy | 3 (22%) |
| 3 × 8 Gy | 2 (14%) |
| GTV max diameter largest GTV (cm) | 5.1 ± 6.6 |
| Total GTV (cm3) | 8.9 ± 6.7 |
| Total PTV (cm3) | 13.0 ± 8.8 |
| Maximum dose PTV (D2%) (Gy) | 26.4 ± 3.8 |
| Mean brain dose (brain-GTV) (Gy) | 3.0 ± 1.2 |
| Paddick conformity index (Volume (50% of prescribed dose)/Volume (prescribed dose) |
5.1 ± 1.7 |
| Total V12Gy (brain exclusive GTVs) | 31.0 ± 24.0 |
| V12Gy largest BM | 16.0 ± 15.6 |
BM, brain metastases; GTV, gross tumor volume; PTV, planning target volume; SRS, stereotactic radiotherapy.