Fig. 2From: Dosimetric comparison of different radiation techniques (IMRT vs. 3-dimensional) of the “true” (deep) ano-inguinal lymphatic drainage of anal cancer patientsAxial CT slide 1.5 cm below the lower end of the anal canal in one patient. 30 Gy is represented in colorwash (red area). In this case, about 75% of ano-inguinal lymphatic drainage (cyan) is covered with 3D-RT (a) and just about 50% is covered using IMRT (b)Back to article page