Table 4.
Dosimetric comparisons of without replanning in the initial CT, replanning in the initial CT
| Without replannng in iCT | Replanning in iCT | Sig (p) | |
|---|---|---|---|
| PTVGTV Dmax |
1332.6 ± 42.4 |
1343.5 ± 65.9 |
0.77 |
| PTVGTV Dmean |
1257.2 ± 30.1 |
1253.5 ± 40.3 |
0.97 |
| PTVGTV V93 |
98.2 ± 1.7 |
96.9 ± 3.0 |
0.12 |
| PTVGTV V95 |
94.8 ± 4.7 |
91.8 ± 7.2 |
0.26 |
| PTVCTV Dmax |
1341.8 ± 40.7 |
1349.4 ± 61.3 |
0.85 |
| PTVCTV Dmean |
1087.2 ± 20.7 |
1083.4 ± 31.5 |
0.91 |
| PTVCTV V93 |
99.2 ± 0.7 |
98.9 ± 1.1 |
0.27 |
| PTVCTV V95 |
98.8 ± 0.9 |
98.4 ± 1.3 |
0.62 |
| Brainstem Dmax |
844.7 ± 95.4 |
859.7 ± 89.1 |
0.94 |
| Brainstem Dmean |
448.5 ± 76.4 |
457.2 ± 92.3 |
0.84 |
| Cord Dmax |
695.5 ± 44.2 |
692.0 ± 29.8 |
0.87 |
| Cord Dmean |
409.0 ± 54.7 |
413.3 ± 64.2 |
0.82 |
| Mandible Dmax |
1128.2 ± 95.0 |
1146.9 ± 99.5 |
0.76 |
| Mandible Dmean |
705.4 ± 70.9 |
691.7 ± 70.2 |
0.91 |
| Lt parotid Dmax |
1138.7 ± 114.6 |
1134.0 ± 143.2 |
0.99 |
| Lt parotid Dmean |
581.9 ± 87.1 |
519.4 ± 61.3 |
0.05 |
| Lt parotid V5 |
49.9 ± 12.3 |
42.1 ± 8.5 |
0.01 |
| Rt parotid Dmax |
1151.8 ± 108.1 |
1144.0 ± 95.8 |
0.75 |
| Rt parotid Dmean |
581.2 ± 79.8 |
514.9 ± 32.8 |
0.02 |
| Rt parotid V5 | 50.7 ± 8.3 | 39.5 ± 4.0 | 0.001 |
Note: the unit for dose is cGy, V5 = the volume receiving 5 Gy.