Table 3.
Averaged dosimetric values for organs at risk
| HT Mean ± SD |
SW Mean ± SD |
RA Mean ± SD |
Protons Mean ± SD |
Pairs with statistically significant differences (P = . < 05)/Technique with best result (mean values) | |
|---|---|---|---|---|---|
| Urinary Bladder | |||||
| V10 (%) | 42.0 ± 23.8 | 39.3 ± 23.3 | 46.8 ± 23.2 | 30.2 ± 18.5 | Pr > HT, Pr > SW, Pr > RA, SW > HT, SW > RA / Pr > SW > HT > RA |
| V30 (%) | 26.2 ± 18.6 | 23.5 ± 16.4 | 27.0 ± 19.1 | 21.2 ± 14.7 | Pr > HT, Pr > SW, Pr > RA, SW > HT, SW > RA / Pr > SW > HT > RA |
| V50 (%) | 16.8 ± 12.5 | 15.6 ± 11.6 | 17.0 ± 13.3 | 15.3 ± 11.5 | SW > HT, SW > RA, Pr > RA, Pr > HT / Pr > SW > HT > RA |
| V70 (%) | 6.0 ± 4.9 | 5.4 ± 4.8 | 6.4 ± 4.8 | 5.3 ± 4.7 | Pr > SW, Pr > RA, Pr > HT / Pr > SW > HT > RA |
| Dmean (Gy) | 17.4 ± 10.1 | 15.8 ± 9.6 | 17.9 ± 10.1 | 13.3 ± 9.1 | Pr > HT, Pr > SW, Pr > RA, SW > HT, SW > RA / Pr > SW > HT > RA |
| Dmax (Gy) | 82.5 ± 2.8 | 80.0 ± 2.8 | 80.9 ± 3.1 | 80.9 ± 1.7 | SW > HT, RA > HT, Pr > HT / SW > Pr > RA > HT |
| D1ccm (Gy) | 76.3 ± 8.2 | 76.2 ± 6.3 | 76.3 ± 8.1 | 76.2 ± 6.0 | SW > HT, Pr > HT / Pr > SW > RA > HT |
| Rectum | |||||
| V10 (%) | 59.1 ± 17.9 | 62.7 ± 16.6 | 69.0 ± 18.7 | 24.6 ± 9.2 | Pr > HT, Pr > SW, Pr > RA, HT > SW, HT > RA, SW > RA / Pr > HT > SW > RA |
| V30 (%) | 24.8 ± 7.6 | 32.8 ± 5.7 | 41.7 ± 11.3 | 15.7 ± 5.8 | Pr > HT, Pr > SW, Pr > RA, HT > SW, HT > RA, SW > RA / Pr > HT > SW > RA |
| V50 (%) | 12.8 ± 4.0 | 17.3 ± 2.5 | 23.5 ± 7.5 | 9.3 ± 3.8 | Pr > HT, Pr > SW, Pr > RA, HT > SW, HT > RA, SW > RA / Pr > HT > SW > RA |
| V70 (%) | 1.1 ± 0.7 | 1.5 ± 0.8 | 3.4 ± 1.8 | 1.0 ± 0.8 | Pr > RA, Pr > SW, HT > SW, HT > RA, SW > RA / Pr > HT > SW > RA |
| Dmean (Gy) | 17.3 ± 3.9 | 20.3 ± 3.4 | 24.5 ± 5.3 | 9.0 ± 3.4 | Pr > HT, Pr > SW, Pr > RA, HT > SW, HT > RA, SW > RA / Pr > HT > SW > RA |
| Dmax (Gy) | 78.3 ± 1.8 | 75.9 ± 1.2 | 77.3 ± 1.5 | 76.4 ± 2.2 | Pr > HT, Pr > RA, SW > HT, SW > RA, SW > Pr / SW > Pr > RA > HT |
| D1ccm (Gy) | 67.5 ± 4.1 | 68.9 ± 2.4 | 71.5 ± 2.5 | 65.9 ± 4.2 | HT > SW, HT > RA, SW > RA, Pr > HT, Pr > SW, Pr > RA / Pr > HT > SW > RA |
| Femoral head, right | |||||
| D1ccm (Gy) | 18.0 ± 2.9 | 32.0 ± 6.2 | 28.1 ± 5.3 | 35.2 ± 3.9 | HT > SW, HT > RA, HT > Pr, RA > SW, RA > Pr / HT > RA > SW > Pr |
| Femoral head, left | |||||
| D1ccm (Gy) | 18.1 ± 2.9 | 31.9 ± 5.1 | 26.6 ± 5.0 | 35.5 ± 2.5 | HT > SW, HT > RA, HT > Pr, RA > Pr, RA > SW / HT > RA > SW > Pr |
Abbreviations: HT helical tomotherapy; SW Sliding Window; RA Rapid Arc; Pr Protons; PTV planning target volume; SD standard deviation; Dx (Gy) dose (Gy) absorbed by certain percentage (%) or absolute volume (ccm) of the contoured structure; Vx percentage of organ volume exposed to certain radiation dose; > dosimetric superiority