Table 5.
Planning objectives used by all centers
| Dosimetric objectives and constraints | Objective (number of respondents) | Number ofrespondents |
|---|---|---|
| Prostate | ||
| V100% (n = 17) | > 99.8% | 1 |
| > 99.5% | 1 | |
| > 99% | 5 | |
| > 98% | 2 | |
| > 95% | 8 | |
| CTV | ||
| V100% (n = 9) | > 95% | 7 |
| Don’t grow CTV | 1 | |
| CTV = prostate | 1 | |
| Prostate | ||
| V150% (n = 15) | < 70% | 2 |
| < 65% | 2 | |
| < 60% | 2 | |
| > 55-65% | 1 | |
| 55-60% | 1 | |
| < 55% | 1 | |
| < 50% | 1 | |
| 40-65% | 1 | |
| CTV | ||
| V150% (n = 8) | < 70% | 1 |
| < 65% | 1 | |
| < 50% | 4 | |
| Don’t grow CTV | 1 | |
| CTV = Prostate | 1 | |
| Urethra | ||
| D30% (n = 11) | < 130% | 5 |
| < 150% | 3 | |
| < 181 Gy | 2 | |
| < 240 Gy | 1 | |
| D10% (n = 8) | < 150% | 7 |
| < 165% | 1 | |
| V150% (n = 1) | = 0 cc | 1 |
| V140% (n = 1) | < 5% of the volume | 1 |
| Rectum | ||
| V100% (n = 6) | < 5% | 2 |
| < 0.4 cc | 1 | |
| < 0.9 cc | 1 | |
| < 1 cc | 1 | |
| < 1.3 cc | 1 | |
| D2cc (n = 10) | < 145 Gy | 10 |
| D0.1cc (n = 3) | < 200 Gy | 3 |
| V69% (n = 1) | < 2.6 cc | 1 |
| V91% (n = 1) | < 1 cc | 1 |
CTV – clinical target volume, Vx% – volume receiving x% of the prescribed dose, Dxcc – dose received by x cc of the volume, Dx% – dose received by x% of the volume, Gy – Gray, cc – cubic centimeter