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Table 2 Target coverage and critical organ dose

From: A retrospective study of adjuvant proton radiotherapy for breast cancer after lumpectomy: a comparison of conventional-dose and hypofractionated dose

 

40.05 Gy group

50 Gy group

CTV(clinical target volume)

V95

99.86 ± 0.13%

99.72 ± 0.28%

V99

94.37 ± 4.66%

94.13 ± 4.03%

Ipsilateral lung

V5

23.40 ± 9.73%

30.72 ± 9.95%

V10

17.08 ± 7.10%

23.38 ± 8.49%

V20

8.86 ± 4.31%

13.41 ± 5.91%

V30

3.43 ± 2.36%

6.63 ± 3.74%

V40

0.31 ± 0.55%

2.53 ± 1.97%

V50

–

0.28 ± 0.49%

Dmean

4.53 ± 1.84 Gy

6.61 ± 2.52 Gy

Contralateral lung

V5

0.45 ± 0.79%

2.16 ± 2.17%

V10

0.17 ± 0。01%

0.92 ± 1.11%

V20

0.03 ± 0.07%

0.19 ± 0.31%

V30

0.01 ± 0.00%

0.04 ± 0.09%

V40

–

0.02 ± 0.03%

V50

–

–

Dmean

0.11 ± 0.13 Gy

0.39 ± 0.33 Gy

Heart (left breast cancer)

D2%

9.09 ± 6.19 Gy

15.40 ± 9.90 Gy

V5

3.25 ± 1.98%

4.74 ± 2.87%

V10

1.87 ± 1.29%

3.09 ± 2.20%

V20

0.71 ± 0.66%

1.63 ± 0.85%

V30

0.20 ± 0.24%

0.85 ± 0.31%

V40

0.02 ± 0.04%

0.31 ± 0.31%

V45

–

0.13 ± 0.03%

V50

–

0.03 ± 0.06%

Dmean

0.58 ± 0.33 Gy

0.98 ± 0.63 Gy

LAD (left anterior descending artery)

D2%

17.33 ± 10.98 Gy

28.59 ± 11.05 Gy

Dmean

4.27 ± 3.27 Gy

4.86 ± 2.42 Gy