Patient Technique | 1 | 2 | 3 | 4 | 5 | ||
---|---|---|---|---|---|---|---|
PTVboost | CI95 | VMAT | 1.37 ± 0.03 | 1.41 ± 0.06 | 1.46 ± 0.10 | 1.30 ± 0.03 | 1.31 ± 0.03 |
IMRT | 1.54 ± 0.09 | 1.44 ± 0.04 | 1.50 ± 0.07 | 1.33 ± 0.05 | 1.42 ± 0.17 | ||
PTVtotal | CI95 | VMAT | 1.43 ± 0.06 | 1.58 ± 0.07 | 1.52 ± 0.04 | 1.57 ± 0.08 | 1.40 ± 0.04 |
IMRT | 1.53 ± 0.04 | 1.71 ± 0.09 | 1.63 ± 0.06 | 1.67 ± 0.10 | 1.57 ± 0.11 | ||
Spinal cord | D1% (Gy) | VMAT | 42.1 ± 5.5 | 44.7 ± 2.6 | 43.4 ± 3.5 | 44.0 ± 4.1 | 42.9 ± 3.6 |
IMRT | 43.8 ± 4.3 | 44.3 ± 2.9 | 44.8 ± 2.4 | 44.5 ± 4.7 | 44.4 ± 4.2 | ||
Brain stem | D1% (Gy) | VMAT | 48.3 ± 4.7 | 42.1 ± 6.0 | 45.5 ± 5.6 | 41.4 ± 6.9 | 41.7 ± 5.0 |
IMRT | 48.2 ± 1.9 | 45.7 ± 4.3 | 47.6 ± 4.2 | 40.5 ± 3.6 | 37.9 ± 5.0 | ||
Parotid gland ipsilateral | Dmean (Gy) | VMAT | 21.7 ± 2.0 | 30.3 ± 4.9 | 24.8 ± 3.5 | 38.1 ± 9.2 | 25.1 ± 2.4 |
IMRT | 23.6 ± 1.7 | 33.3 ± 3.5 | 30.5 ± 10.2 | 41.8 ± 11.0 | 26.3 ± 3.2 | ||
Parotid gland contralateral | Dmean (Gy) | VMAT | 21.1 ± 1.9 | 23.1 ± 1.0 | 22.1 ± 2.1 | 25.0 ± 2.9 | 18.6 ± 1.9 |
IMRT | 23.2 ± 1.9 | 24.1 ± 1.3 | 24.2 ± 0.5 | 25.3 ± 3.5 | 19.4 ± 1.5 | ||
Submandibular gland contralateral | Dmean (Gy) | VMAT | 49.2 ± 6.0 | 55.0 ± 6.3 | -- | -- | 54.8 ± 4.3 |
IMRT | 49.6 ± 5.6 | 57.4 ± 6.4 | -- | -- | 55.7 ± 3.7 | ||
Oral cavity | Dmean (Gy) | VMAT | 31.3 ± 4.8 | 34.7 ± 5.4 | 33.3 ± 7.0 | 47.7 ± 1.7 | 36.5 ± 7.4 |
IMRT | 34.2 ± 4.8 | 38.2 ± 3.1 | 37.4 ± 8.9 | 48.8 ± 1.7 | 38.7 ± 7.2 | ||
Larynx | Dmean (Gy) | VMAT | 43.2 ± 4.4 | 44.9 ± 7.3 | 47.1 ± 4.6 | 46.8 ± 5.5 | 45.3 ± 5.5 |
IMRT | 44.5 ± 4.3 | 45.5 ± 5.8 | 47.5 ± 4.2 | 47.7 ± 4.7 | 47.0 ± 3.9 | ||
Pharyngeal constrictors° | Dmean (Gy) | VMAT | 42.3 ± 3.9 | 50.5 ± 6.6 | 48.9 ± 2.6 | 48.0 ± 4.9 | 45.7 ± 5.2 |
IMRT | 42.1 ± 2.7 | 48.2 ± 3.7 | 49.3 ± 2.3 | 47.9 ± 3.6 | 46.9 ± 2.6 | ||
Mandible° | Dmean (Gy) | VMAT | 41.7 ± 1.3 | 45.1 ± 1.4 | 55.2 ± 1.7 | 54.2 ± 1.5 | 46.7 ± 1.7 |
IMRT | 42.4 ± 0.9 | 47.2 ± 1.2 | 57.6 ± 1.5 | 55.2 ± 1.6 | 48.9 ± 1.7 | ||
Effective delivery time | (min:sec) | VMAT | 5:38 ± 0:42 | 6:00 ± 0:48 | 6:22 ± 1:28 | 6:07 ± 1:31 | 5:26 ± 1:04 |
IMRT | 12:52 ± 0:41 | 13:09 ± 2:18 | 13:46 ± 1:07 | 13:30 ± 1:50 | 12:57 ± 2:23 | ||
MUs | -- | VMAT | 581 ± 55 | 641 ± 90 | 735 ± 170 | 668 ± 91 | 589 ± 73 |
IMRT | 702 ± 92 | 836 ± 166 | 975 ± 125 | 855 ± 100 | 773 ± 142 |