Table 1.
Lung tumor SBRT plan characteristics
| Plan characteristics (n = 20) | Number (percentage) or median (range) |
|---|---|
| Lobe | |
| RUL | 9 (45%) |
| LLL | 5 (25%) |
| LUL | 2 (10%) |
| RML | 2 (10%) |
| RLL | 1 (5%) |
| Lingula | 1 (5%) |
| Location | |
| Peripheral | 18 (90%) |
| Central | 2 (10%) |
| Total bilateral lung volume | 3421 mL (2298 to 6228 mL) |
| GTV greatest axial diameter | 3.5 cm (2.1 to 5.5 cm) |
| GTV volume | 14.5 mL (3.6 to 59.9 mL) |
| ITV volume | 23.3 mL (4.6 to 77.7 mL) |
| ITV subtract GTV volume | 5.5 mL (1.0 to 22.3 mL) |
| Tumor motion | |
| Superior–inferior | 4.5 mm (0 to 20 mm) |
| Anterior–posterior | 3 mm (0 to 9 mm) |
| Left–right | 2 mm (0 to 8 mm) |
| Prescription dose and fractions | |
| 60 Gy in 5 fractions | 2 (10%) |
| 54 Gy in 3 fractions | 3 (15%) |
| 50 Gy in 5 fractions | 7 (35%) |
| 48 Gy in 4 fractions | 2 (10%) |
| 42.5 Gy in 5 fractions | 1 (5%) |
| 37.5 Gy in 3 fractions | 1 (5%) |
| 25 Gy in 1 fraction | 2 (10%) |
| 24 Gy in 1 fraction | 1 (5%) |
| 22 Gy in 1 fraction | 1 (5%) |
| Prescription EQD2 (α/β = 3) | 130 Gy (97.75 to 226.8 Gy) |
| Isotropic PTVRTT margin | |
| 5.0 mm | 14 (70%) |
| 2.5 mm | 4 (20%) |
| 2.0 mm | 2 (10%) |