Fig. 1From: Dosimetric analysis and comparison of reduced longitudinal cranial margins of VMAT-IMRT of rectal cancerRectal cancer - cranial radiation target volume reduced by 1, 2 and 3 cm. Red: Original PTV, PTV -1 cm, PTV-2 cm and PTV-3 cm. Original PTV cranial on level of L4/L5 interspace (posterior), PTV - 3 cm on the level of L5/S1. Green: Peritoneal space, yellow: Urinary bladderBack to article page