[en] The dose distributions for irradiation with telecobalt and 15 MeV x-ray,therapy, respectively, for the radiation treatment of the tumours localized in the sinus maxillaris are compared. In the case of ventral and lateral irradiation with two fixed fields the three-dimesional isodoses proved to be better for x-ray irradiation, moreover, the radiation burden of crystalline lens and of the skin was also lower. The isodose imaging was carried out by a CT controlled program, using a VAX11-780 computer and FORTMAN77 program language. (author)