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Table 1 PTV volume, anatomical characteristics and dose parameters of the left lung and the heart in FB and DIBH and the differences (∆)

From: Deep inspiration breath-hold for left-sided breast irradiation: Analysis of dose-mass histograms and the impact of lung expansion

 

FB

DIBH

∆ (DIBH-FB)

∆ (DIBH-FB)/FB

mean ± SD

mean ± SD

mean ± SD

mean ± SD

PTV volume [cm3]

969 ± 377

956 ± 374

− 13 ± 32

− 1 ± 3%

left lung

 volume [cm3]

1432 ± 290

2581 ± 321

1149 ± 261

84 ± 26%

 mass [g]

439 ± 68

443 ± 76

4 ± 46

1 ± 10%

 density [g/cm3]

0.31 ± 0.05

0.17 ± 0.03

−0.14 ± 0.04

− 44 ± 7%

 Dmean (DVH) [Gy]

10.0 ± 1.7

8.1 ± 1.6

− 1.9 ± 1.0

−19 ± 9%

 Dmean (DMH) [Gy]

8.3 ± 1.5

7.3 ± 1.5

−1.0 ± 0.9

−12 ± 11%

 V20 [%]

18.9 ± 3.6

14.4 ± 3.3

− 4.5 ± 2.1

− 24 ± 10%

 V20 [cm3]

267.5 ± 67.0

367.2 ± 86.6

99.7 ± 69.4

40 ± 29%

 M20 [%]

15.0 ± 3.0

12.6 ± 2.9

− 2.4 ± 1.9

− 16 ± 13%

 M20 [g]

65.3 ± 16.0

55.7 ± 16.4

− 9.6 ± 11.7

− 14 ± 18%

heart

 Dmean (DVH) [Gy]

4.0 ± 1.9

1.7 ± 1.0

− 2.3 ± 1.4

− 53 ± 19%

 V20 [%]

6.2 ± 4.2

1.2 ± 1.0

− 5.0 ± 3.1

−83 ± 23%

 V40 [%]

3.6 ± 2.7

0.4 ± 0.9

−3.3 ± 2.2

−87 ± 26%

  1. PTV planning target volume, DVH dose-volume histogram, DMH dose-mass histogram, FB free breathing, DIBH deep inspiration breath-hold, SD standard deviation