Table 2.
Dosimetric parameters for PTV and OAR
| Parameter |
Value | ||
|---|---|---|---|
| (mean ± SD) | |||
| Prostate PTV | Volume | (ml) | 92.4 ± 23.0 |
| D2% | (Gy) | 79.3 ± 0.2 | |
| Dmean | (Gy) | 78 | |
| D95% | (Gy) | 76.4 ± 0.3 | |
| Nodal PTV | Volume | (ml) | 774.6 ± 130.6 |
| Dmean | (Gy) | 46.8 ± 0.4 | |
| D95% | (Gy) | 44.8 ± 0.4 | |
| Rectum | Volume | (ml) | 61.1 ± 15.8 |
| Dmean | (Gy) | 39.8 ± 2.6 | |
| D2% | (Gy) | 77.1 ± 1.1 | |
| V70Gy | (%) | 11.3 ± 3.5 | |
| V50Gy | (%) | 26.3 ± 4.9 | |
| V30Gy | (%) | 64.4 ± 10.7 | |
| Bladder | Volume | (ml) | 193.6 ± 89.8 |
| Dmean | (Gy) | 43.9 ± 4.1 | |
| D2% | (Gy) | 78.0 ± 0.8 | |
| V70Gy | (%) | 11.6 ± 5.7 | |
| V50Gy | (%) | 28.1 ± 11.4 | |
| V30Gy | (%) | 80.5 ± 11.6 | |
| Left femoral head | D2% | (Gy) | 43.1 ± 2.9 |
| Right femoral head | D2% | (Gy) | 42.2 ± 2.9 |
| Bowel bag | D2% | (Gy) | 47.2 ± 0.7 |
| V45Gy | (ml) | 76.7 ± 30.3 | |
PTV = planning target volume, OAR = organ at risk, Dn% = minimal dose to n% of the structure, VnGy = absolute or percentage structure volume receiving ≥ n Gy.