Table 2.
The summary of dose-volume parameters in the clinical plan and KBP
| Parameter | Clinical goal | Clinical plan | KBP | p-value | |
|---|---|---|---|---|---|
| PTV − R | Dmax (%) | < 110% | 106.40 (105.83, 107.68) | 105.60 (105.30, 106.10) | < 0.01 |
| Dmin (%) | – | 91.55 (89.88, 93.98) | 91.75 (89.63, 92.90) | 0.33 | |
| Dmean (%) | 99–103% | 102.20 (102.00, 102.68) | 102.05 (101.93, 102.20) | 0.07 | |
| HI | – | 5.08 (4.54, 6.17) | 4.76 (4.52, 4.89) | 0.03 | |
| CI95 | – | 1.27 (1.23, 1.32) | 1.18 (1.17, 1.20) | < 0.01 | |
| Rectal wall | V40 Gy (%) | < 60% | 49.10 (45.38, 55.20) | 49.60 (46.03, 52.93) | 0.94 |
| V60 Gy (%) | < 35% | 26.05 (22.80, 29.20) | 27.60 (24.08, 30.95) | 0.20 | |
| V70 Gy (%) | < 25% | 15.00 (12.40, 16.88) | 16.40 (14.70, 16.90) | 0.13 | |
| V78 Gy (%) | < 1% | 0.0045 (0.00, 0.040) | 0.28 (0.18, 0.47) | < 0.01 | |
| Bladder wall | V40 Gy (%) | < 60% | 40.65 (34.93, 47.85) | 38.95 (27.90, 52.60) | 0.82 |
| V70 Gy (%) | < 35% | 22.30 (17.15, 27.25) | 21.00 (15.95, 27.43) | 0.67 |
Abbreviations: PTV − R volume of the planning target volume minus rectum, HI homogeneity index, CI95 95% isodose conformity index