Fig. 2From: Impact of VMAT-IMRT compared to 3D conformal radiotherapy on anal sphincter dose distribution in neoadjuvant chemoradiation of rectal cancerIsodoses in rectal cancer patients treated with neoadjuvant radiation therapy. There is a steep drop of dose from the PTV in caudal extension in the area of the caudal anal sphincters with IMRT (left), whereas there is a much wider distance between the different isodoses in 3D-radiation technique (right)Back to article page