Table 3.
Dose comparison of the ipsilateral lung, the contralateral lung, contralateral breast, liver, esophagus, and spinal cord in the four plans
| Structure | Dose parameter | 2FIMRT | 4FIMRT | 2ArcVMAT | 1ArcVMAT |
|---|---|---|---|---|---|
| Body-PTV | Dmean(Gy) | 2.2 ± 0.7 A | 2.4 ± 0.7 A | 2.3 ± 0.7 A | 2.8 ± 0.8 B |
| ID (Gy*litre) | 43.7 ± 13.5 A | 48.0 ± 13.9 B,a | 44.7 ± 13.6 A,a | 54.5 ± 16.7 B,b | |
| Left Lung | Dmean(Gy) | 4.9 ± 2.4 A | 5.2 ± 2.1 | 5.0 ± 2.0 A | 5.4 ± 1.8 B |
| V5 | 16.6 % ± 7.9 % A | 19.1 % ± 7.7 % B | 18.4 % ± 7.2 % B,a | 21.7 % ± 6.9 % B,b | |
| V20 | 9.3 % ± 5.1 % | 9.5 % ± 4.7 % | 9.2 % ± 4.2 % | 9.3 % ± 4.1 % | |
| V40 | 4.3 % ± 2.8 % A | 3.7 % ± 2.3 % B,a | 3.8 % ± 2.2 % a | 3.1 % ± 1.9 % B,b | |
| Right lung | Dmean (Gy) | 0.2 ± 0.1 A | 0.3 ± 0.2 A | 0.3 ± 0.1 A | 0.8 ± 0.4 B |
| V5 | 0.0 % ± 0.0 % A | 0.4 % ± 1.0 % | 0.0 % ± 0.1 % a | 0.9 % ± 1.5 % B,b | |
| Right breast | Dmean(Gy) | 0.5 ± 0.3 A | 0.8 ± 0.4 B,a | 0.9 ± 0.3 B,a | 1.8 ± 0.8 B,b |
| V5 | 0.1 % ± 0.2 % A | 1.9 % ± 1.9 % B,a | 0.6 % ± 1.1 % B,b | 1.5 % ± 2.3 % B | |
| Esophagus | Dmean(Gy) | 0.3 ± 0.1 A | 0.4 ± 0.1 A | 0.4 ± 0.1 A | 0.7 ± 0.3 B |
| Liver | Dmean(Gy) | 0.2 ± 0.1 A | 0.2 ± 0.1 A | 0.3 ± 0.2 A | 1.0 ± 0.7 B |
| Spinal cord | Dmean(Gy) | 0.1 ± 0.0 A | 0.2 ± 0.0 A | 0.2 ± 0.0 A | 0.4 ± 0.2 B |
“A” is statistically significantly different from “B” (p < 0.05); “a” is statistically significantly different from “b” (p < 0.05). No other statistically significant difference was found between any two (p > 0.05)