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Table 3 Dose comparison of the ipsilateral lung, the contralateral lung, contralateral breast, liver, esophagus, and spinal cord 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

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

  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)