Table 1.
Summary of patients' characteristics and treatment parameters
| Parameter | No. |
|---|---|
| Number of patients | 31 |
| Median age | 60 |
| Sex (F/M) | 16/15 |
| Histology | |
| Lung | 14 |
| Breast | 5 |
| Melanoma | 8 |
| Ovary | 1 |
| Kidney | 3 |
| No. of lesions per patient | |
| 4-7 lesions | 20 |
| 8-10 lesions | 11 |
| Tumor location | |
| Frontal | 60 (29.4%) |
| Parietal | 42 (20.6%) |
| Temporal | 41 (20%) |
| Cerebellar | 40 (19.7%) |
| Occipital | 21 (10.3%) |
| SRS dose | |
| 22 Gy | 71 (34.8%) |
| 20 Gy | 115 (56.3%) |
| 16/18 Gy | 18 (8.9%) |
| GTV (cm3) | |
| Mean (SD) | 0.65 (0.40) |
| Median (range) | 0.40 (0.07-3.8) |
| Mean total GTV (SD) | 3.9 (1.93) |
| Median total GTV (range) | 3.8 (1.4-9.9) |
| PTV (cm3) | |
| Mean (SD) | 0.89 (0.42) |
| Median | 0.68 (0.18-6.1) |
| Mean total PTV | 6.6 (2.5) |
| Median total PTV | 6.5 (2.6-13.2) |
| Distance from isocenter | |
| Median (range) | 39 (0.6-77) |
| Mean (SD) | 38.6 (7.5) |
| Conformity index | |
| Median (range) | 1.32 (1.1-1.6) |
| Mean (SD) | 1.3 (0.05) |
| Gradient index | |
| Median (range) | 3.94 (2.78-5.60) |
| Mean (SD) | 3.8 (0.27) |
| D95 (Gy) | |
| Mean (SD) | 21.1 (0.34) |
| Median (range) | 20.8 (17.6-24.1) |
| V95 (%) | |
| Mean (SD) | 99.5 (0.3) |
| Median (range) | 99.0 (92.4-100) |
Abbreviations: GTV = gross tumor volume; PTV = planning target volume; SD = standard deviation; SRS = stereotactic radiosurgery.