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Three-dimensional conformal radiotherapy (3DCRT) is an advanced radiation treatment technique that shapes the radiation beams to match the shape of the tumor and it is used to treat brain tumors while avoiding radiation to the healthy tissue surrounding brain tumor.  the purpose of this study is to evaluate the dosimetric data (the planning target volume (PTV), dose homogeneity, dose of organs at risk (OARs)) among the patients with a brain tumor by using three-dimensional conformal radiotherapy (3D-CRT). 

In eight patients with brain tumors being treated by 3DCRT, the target, lenses of eyes, optic nerves, brain stem, and open chiasm were contoured. Two opposed lateral fields were used. The prescribed photon beam dose was depending on the type of tumor, in general for all cases is divided into 20 fractions using 6 MV photons.

The comparison of 3D-CRT …