Table 1.
Dose constraints for the target and critical structures.
| Structure | Dose constraint | |
|---|---|---|
| PTV54 | Conformal16 | IMRT15,17,25 |
| D95% ≥ 54 Gy | D98% ≥ 51.3 Gy | |
| D5% ≤ 57.8 Gy | D2% < 62.1 Gy | |
| Bladder15 | V35 Gy ≤ 50% | |
| V40 Gy ≤ 35% | ||
| V50 Gy ≤ 5% | ||
| External genitalia15 | V20 Gy ≤ 50% | |
| V30 Gy ≤ 35% | ||
| V40 Gy ≤ 5% | ||
| Femoral heads15 | V40 Gy ≤ 35% | |
| V44 Gy ≤ 5% | ||
| Small bowel15 | V30 Gy ≤ 350 cc | |
| V35 Gy ≤ 150 cc | ||
| V45 Gy ≤ 20 cc | ||
| V50 Gy = 0 cc | ||
| Large bowel26 | V55 Gy max | |
| V40 Gy < 50% | ||
PTV54, planning target volume receiving 54 Gray; Dx%, x% of the dose; VnGy, volume receiving n Gray (Gy); cc, cubic centimetres; max, maximum; IMRT, intensity modulated radiation therapy.