Fig. 3From: Volumetric and dosimetric comparison of organs at risk between the prone and supine positions in postoperative radiotherapy for prostate cancerOverlapping volumes of the PTV and the extended volumes with the small intestine. a PTV ∩ small intestine (P = 0.036). b PTV + 0.5 cm ∩ small intestine (P = 0.035). c PTV + 1 cm ∩ small intestine (P = 0.035). d PTV + 2 cm ∩ small intestine (P = 0.035). e PTV + 3 cm ∩ small intestine (P = 0.021). f PTV + 4 cm ∩ small intestine (P = 0.16). Abbreviations: PTV planning target volume, ∩ overlapping. The plots of the same patients are connected by black lines. Overlapping volumes were zero in both the prone and supine position in eleven patients of the PTV, ten patients of the PTV + 0.5 cm, PTV + 1 cm, and PTV + 2 cm, five patients of the PTV + 3 cm, and two patients of the PTV + 4 cm. Their lines and plots are overlapping at the bottom of each graph. P values were calculated by the Wilcoxon signed-rank testBack to article page