Table 5.
Dmean (cGy), D2% (cGy) and V8 (%) to organs at risk (OARs) for volumetric modulated arc therapy (VMAT) and helical tomotherapy (HT) plans
| Structure | Dmean [cGy] | D2% [cGy] | V8 (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| VMAT | HT | p-value | VMAT | HT | p-value | VMAT | HT | p-value | |
| Eye balls | 12.72 ± 2.14 | 35.88 ± 10.87 | 0.109 | 16.70 ± 5.64 | 8.32 ± 1.43 | 0.109 | 0 | 0 | 0 |
| Eye lens | 10.88 ± 2.38 | 26.20 ± 4.09 | 0.068 | 13.50 ± 3.81 | 28.20 ± 5.82 | 0.144 | 0 | 0 | 0 |
| Optic chiasm | 15.80 ± 3.53 | 15.80 ± 3.54 | 0.109 | 19.75 ± 4.74 | 8.32 ± 2.43 | 0.109 | 0 | 0 | 0 |
| EACs | 630.03 ± 7.49 | 644.02 ± 12.73 | 0.180 | 621.95 ± 4.31 | 700.50 ± 21.92 | 0.180 | 0 | 0 | 0 |
| Parotids | 277.72 ± 30.56 | 463.17 ± 54.64 | 0.028 | 661.13 ± 95.20 | 632.20 ± 32.90 | 0.893 | 9.05 ± 1.57 | 2.58 ± 1.43 | 0.068 |
| TMJ | 122.93 ± 21.99 | 505.38 ± 85.35 | 0.008 | 356.27 ± 67.66 | 667.50 ± 93.85 | 0.028 | 0 | 0 | 0 |
| Mandible | 683.10 ± 112.06 | 674.54 ± 83.83 | 0.064 | 867.92 ± 19.24 | 827.42 ± 19.56 | 0.020 | 31.66 ± 13.62 | 25.53 ± 15.21 | 0.023 |
| Thyroid gland | 778.34 ± 33.23 | 751.07 ± 85.04 | 0.363 | 860.08 ± 40.97 | 832.29 ± 12.96 | 0.019 | 41.71 ± 12.73 | 37.95 ± 17.19 | 0.594 |
| Larynx | 753.28 ± 39.49 | 727.85 ± 68.82 | 0.221 | 857.47 ± 28.19 | 827.09 ± 23.76 | 0.011 | 31.91 ± 16.78 | 27.24 ± 16.56 | 0.347 |
| Esophagus | 810.39 ± 19.61 | 804.07 ± 15.49 | 0.272 | 877.64 ± 17.09 | 846.23 ± 16.02 | 0.013 | 77.55 ± 11.22 | 75.1 ± 12.27 | 0.272 |
| Humeral Heads | 237.54 ± 55.34 | 388.90 ± 83.26 | 0.012 | 544.16 ± 105.78 | 615.50 ± 114.79 | 0.123 | 0 | 0 | 0 |
| Breast | 362.79 ± 57.28 | 334.46 ± 62.35 | 0.500 | 777.28 ± 60.66 | 484.54 ± 58.92 | 0.144 | 1.94 ± 1.46 | 0.76 ± 0.03 | 0.068 |
| Lungs | 501.14 ± 72.30 | 545.67 ± 90.08 | 0.058 | 842.33 ± 18.43 | 827.11 ± 15.81 | 0.022 | 8.87 ± 2.85 | 10.07 ± 3.75 | 0.394 |
| Heart | 545.34 ± 81.11 | 527.14 ± 92.61 | 0.421 | 839.94 ± 28.02 | 815.89 ± 23.94 | 0,000 | 8.46 ± 1.54 | 7.71 ± 1.08 | 0.077 |
| Liver | 308.63 ± 57.41 | 366.19 ± 97.25 | 0.007 | 749.36 ± 76.17 | 756.42 ± 65.22 | 0.557 | 1.72 ± 0.40 | 1.69 ± 0.46 | 0.498 |
| Stomach | 680.98 ± 79.12 | 655.71 ± 33.17 | 0.173 | 857.90 ± 29.35 | 831.57 ± 46.26 | 0.138 | 25.13 ± 1.84 | 28.76 ± 2.65 | 0.917 |
| Right kidney | 391.14 ± 62.39 | 314.81 ± 54.22 | 0.000 | 666.83 ± 106.46 | 591.68 ± 101.00 | 0.048 | 1.27 ± 0.83 | 1.75 ± 0.85 | 0.155 |
| Left kidney | 557.77 ± 61.76 | 553.14 ± 86.79 | 0.848 | 791.76 ± 104.13 | 825.74 ± 20.24 | 0.372 | 11.85 ± 2.02 | 8.76 ± 1,43 | 0.046 |
| Brain stem | 122.30 ± 40.74 | 211.75 ± 13.91 | 0.109 | 471.53 ± 73.33 | 409.25 ±42.15 | 0.285 | 0 | 0 | 0 |
| Spinal marrow | 540.43 ± 91.62 | 466.20 ± 77.09 | 0.061 | 731.64 ± 72.57 | 598.93 ± 105.01 | 0.005 | 2.61 ± 1.81 | 0.91 ± 0.51 | 0.173 |
| Vertebral body | 634.01 ± 69.87 | 575.10 ± 83.12 | 0.075 | 733.55 ± 20.26 | 834.22 ± 11.28 | 0.753 | 17.6 ± 1.53 | 10.52 ± 2.41 | 0.028 |
| Bowel | 414.00 ± 46.73 | 454.43 ± 66.16 | 0.128 | 837.42 ± 54.56 | 815.04 ± 67.88 | 0.018 | 9.83 ± 3.05 | 11.41 ± 2.04 | 0.570 |
| Rectum | 604.29 ± 99.50 | 618.27 ± 86.77 | 0.865 | 820.19 ± 47.53 | 824.57 ± 18.93 | 0.397 | 9.23 ± 3.26 | 13.96 ± 4.74 | 0.570 |
| Bladder | 543.19 ± 80.16 | 534.06 ± 70.59 | 0.896 | 807.26 ± 86.81 | 739.10 ± 207.48 | 0.011 | 5.69 ± 2.50 | 9.64 ± 3.73 | 0.586 |
| Femoral heads | 452.21 ± 99.06 | 446.59 ± 97.58 | 0.868 | 749.69 ± 92.74 | 699.86 ± 102.84 | 0.016 | 1.61 ± 0.31 | 2.24 ± 1.15 | 0.480 |
| Gonads | 101.24 ± 88.59 | 226.33 ± 78.52 | 0.028 | 296.80 ± 86.81 | 418.00 ± 59.30 | 0.068 | 0 | 0 | 0 |
EAC — external auditory canal; TMJ — temporomandibular joint