Figure 4.

Isodose distribution in two patients, one with a left temporal lobe tumor and the other with a left frontoparietal tumor planned with three‐dimensional conformal radiation therapy (3D‐CRT, left) and intensity‐modulated radiation therapy (IMRT, right) techniques. For 3D‐CRT, both patients had anteroposterior and left lateral wedge paired fields. (The second patient had an additional right lateral field during the first 4500 cGy.) For IMRT, five oblique beams were used for both patients. From right to left, the isodose lines correspond to doses of 1800 cGy, 2400 cGy, 4500 cGy, 5643 cGy (95% of prescription dose), and 5940 cGy respectively.