Table 2 Dose-volume histograms statistics for the organs at risk
|  |  | Average ± *S.D. | |||
|---|---|---|---|---|---|
Organ | Volume (ml) ± *S.D. | Helical tomotherapy | Conventional radiotherapy | †Decreasing percentage | p value |
Rectum | 43.5 ± 18.2 |  |  |  |  |
Mean dose |  | 41.3 ± 5.1 Gy | 50.9 ± 1.9 Gy | 18.9% | < 0.01 |
V50.4 |  | 37.2 ± 30.1% | 80.8 ± 12.4% | 55.6% | < 0.01 |
V40 |  | 68.3 ± 20.9% | 95.2 ± 4.2% | 35.0% | < 0.01 |
V30 |  | 82.2 ± 15.3% | 98.4 ± 2.6% | 16.6% | < 0.01 |
Bladder | 59.8 ± 24.2 |  |  |  |  |
Mean dose |  | 40.5 ± 3.5Gy | 50.2 ± 2.5Gy | 19.3% | < 0.01 |
V50.4 |  | 29.5 ± 14.7% | 74.4 ± 17.6% | 61.3% | < 0.01 |
V45 |  | 49.1 ± 13.7% | 86.0 ± 11.5% | 43.2% | < 0.01 |
V40 |  | 57.9 ± 12.6% | 91.3 ± 8.5% | 36.8% | < 0.01 |
V30 |  | 75.7 ± 12.3% | 100.0 ± 0% | 24.3% | < 0.01 |
Intestine | 1523.3 ± 1389.4 |  |  |  |  |
Mean dose |  | 25.1 ± 2.4Gy | 34.2 ± 4.2Gy | 26.3% | < 0.01 |
V50.4 |  | 0.4 ± 0.4% | 20.0 ± 10.7% | 98.2% | < 0.01 |
V40 |  | 4.9 ± 3.2% | 33.3 ± 13.1% | 84.1% | < 0.01 |
V30 |  | 23.5 ± 11.9% | 59.5 ± 10.4% | 61.1% | < 0.01 |
V20 |  | 69.2 ± 10.9% | 86.6 ± 8.0% | 20.1% | < 0.01 |
Right femur | 114.4 ± 16.2 |  |  |  |  |
V30 |  | 15.5 ± 14.2% | 23.2 ± 29.1% | 19.0% | 0.47 |
Left femur | 114.3 ± 14.0 |  |  |  |  |
V30 |  | 16.1 ± 13.9% | 22.3 ± 28.5% | 12.9% | 0.54 |
Left pelvic bone | 187.3 ± 19.4 |  |  |  |  |
V10 |  | 99.9 ± 0.1% | 93.1 ± 4.8% | -6.8% | < 0.01 |
V20 |  | 79.1 ± 4.6% | 86.2 ± 5.6% | 8.2% | < 0.01 |
Right pelvic bone | 189.4 ± 20.1 |  |  |  |  |
V10 |  | 99.9 ± 0.1% | 95.5 ± 2.1% | -4.4% | < 0.01 |
V20 |  | 78.3 ± 4.8% | 89.2 ± 3.1% | 12.2% | < 0.01 |