Table 2.
Dose-volumetric parameters when 48 Gy was prescribed at the isocenter
| Group | IC dose [Gy] | ITV |
PTV |
Lungs |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| D95 [Gy] | Min dose [Gy] | Max dose [Gy] | D95 [Gy] | Min dose [Gy] | Max dose [Gy] | HI | Mean dose [Gy] | V20 [%] | V5 [%] | ||
| BPL | 48.0 ± 0.0 | 46.8 ± 0.8 | 46.0 ± 1.1 | 49.8 ± 0.7 | 45.7 ± 0.8 | 43.7 ± 1.2 | 49.9 ± 0.8 | 1.1 ± 0.0 | 2.9 ± 0.8 | 3.8 ± 1.4 | 14.9 ±4.5 |
| RPL | 48.0 ± 0.0 | 47.8 ± 0.9 | 47.3 ± 1.2 | 51.2 ± 1.2 | 47.4 ± 1.0 | 46.4 ± 1.3 | 51.4 ± 1.4 | 1.1 ± 0.1 | 3.3 ± 0.8 | 4.2 ± 1.6 | 17.2 ± 4.6 |
| XVMC | 48.0 ± 0.0 | 44.5 ± 2.4 | 42.7 ± 2.8 | 50.1 ± 1.1 | 42.1 ± 3.2 | 39.2 ± 3.2 | 50.4 ± 1.1 | 1.3 ± 0.1 | 3.3 ± 0.8 | 4.0 ± 1.5 | 16.8 ± 4.7 |
Data are shown as means ± SD. IC = isocenter, ITV = internal target volume, PTV = planning target volume, D95 = the dose to cover 95% of the volume, Min dose = Minimum dose, Max dose = Maximum dose, HI = homogeneity index, V20Gy and V5Gy = the percentage of the volume receiving more than 20 Gy and 5 Gy, BPL = the Batho power-law correction, RPL = the radiological path length algorithm, XVMC = the X-ray Voxel Monte Carlo algorithm.