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

From: Prospective study of postoperative whole breast radiotherapy for Japanese large-breasted women: a clinical and dosimetric comparisons between supine and prone positions and a dose measurement using a breast phantom

  Prone Supine p
Mean ± SD
PTV_EVAL
 PTV_EVAL volume (cm3) 629 ± 252 636 ± 247 0.74
 D5% (Gy) 52.3 ± 0.8 53 ± 1 0.004
 D95% (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
OARs
 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
  1. HI homogeneity index (D5%/D95%), OARs organs at risk, PTV_EVAL planning target volume for evaluation