Table 4.
Dose comparison of the heart, coronary artery and heart minus coronary artery in the four plans
| Structure | Dose parameter | 2FIMRT | 4FIMRT | 2ArcVMAT | 1ArcVMAT |
|---|---|---|---|---|---|
| Heart | Dmean(Gy) | 2.8 ± 1.0 A | 3.0 ± 1.4 a | 3.3 ± 1.3 B | 3.7 ± 1.4 B,b |
| Dmax(Gy) | 50.2 ± 2.3 A | 48.2 ± 3.7 B,a | 44.1 ± 15.7 | 45.4 ± 5.2 B,b | |
| V5 | 8.6 % ± 3.8 % A | 11.0 % ± 6.9 % a | 13.7 % ± 7.0 % B | 16.6 % ± 9.2 % B,b | |
| V20 | 3.4 % ± 1.7 % A | 3.3 % ± 2.3 % A | 3.7 % ± 2.4 % B | 3.4 % ± 2.6 % A | |
| V40 | 0.9 % ± 0.5 % A | 0.7 % ± 0.5 % B | 0.9 % ± 0.6 % a | 0.4 % ± 0.5 % B,b | |
| CA | Dmean(Gy) | 13.2 ± 3.9 | 13.3 ± 4.0 | 12.7 ± 5.8 | 12.7 ± 4.3 |
| Dmax(Gy) | 50.2 ± 1.7 A | 48.7 ± 3.7 A | 48.9 ± 5.3 A | 45.6 ± 4.9 B | |
| V5 | 56.4 % ± 15.4 % A | 60.8 % ± 16.6 % | 62.1 % ± 18.6 % B | 62.7 % ± 15.2 % B | |
| V20 | 26.1 % ± 10.5 % | 25.7 % ± 10.9 % | 27.2 % ± 12.3 % A | 24.8 % ± 13.3 % B | |
| V40 | 7.3 % ± 3.8 % A | 5.9 % ± 3.5 % A | 6.8 % ± 4.0 % A | 3.3 % ± 3.5 % B | |
| Heart-CA | Dmean(Gy) | 1.4 ± 0.5 A | 1.8 ± 0.9 B,a | 2.0 ± 0.9 B,a | 2.5 ± 1.0 B,b |
| V5 | 2.4 % ± 2.0 % A | 5.6 % ± 5.3 % B,a | 7.3 % ± 6.1 % B | 10.5 % ± 8.5 % B,b | |
| V20 | 0.3 % ± 0.6 % | 0.6 % ± 1.2 % | 0.6 % ± 1.2 % | 0.6 % ± 1.1 % | |
| V40 | 0.1 % ± 0.2 % | 0.1 % ± 0.2 % | 0.1 % ± 0.2 % | 0.0 % ± 0.1 % |
“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)