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Table 4 Dose comparison of the heart, coronary artery and heart minus coronary artery in the four plans

From: A comparative dosimetric study of left sided breast cancer after breast-conserving surgery treated with VMAT and IMRT

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 %

  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)