Table 3 Volumes and dosimetric values of PTV_EVAL and OARs in the prone and supine positions

 PTV_EVAL volume (cm³)

629 ± 252

636 ± 247

0.74

 D_5% (Gy)

52.3 ± 0.8

53 ± 1

0.004

 D_95% (Gy)

45.2 ± 1.4

42.3 ± 4.8

0.01

 Dmean (Gy)

48.9 ± 1.8

48.6 ± 1.5

0.53

 HI

1.16 ± 0.04

1.27 ± 0.19

0.008

 Lung V₂₀ (%)

0.8 ± 0.8

4.6 ± 1.7

<0.0001

 Mean lung dose (Gy)

1.4 ± 0.6

3.6 ± 0.8

<0.0001

 Mean heart dose (Gy) (n = 9)

3.1 ± 1.6

3.0 ± 0.9

0.9