Three-dimensional dose distributions for radiotherapy of sinus maxillary tumours.

Three-dimensional dose distributions for the radiation therapy of sinus maxillary tumours have been calculated. Irradiation techniques with 8 MV X-rays and 15 MV X-rays from a linear accelerator (Siemens Mevatron 74 and Siemens Mevatron 77) and 60Co gamma-irradiation (Siemens Gammatron S80) are compared to each other. Using an anterior and a lateral field, the three-dimensional dose distribution of high energy photons shows that the radiation burden of the lens and the skin is significantly lower than with the use of 60Co irradiation. Sufficient dose coverage and sparing of the lens and the skin can be reached using the irradiation technique with 8 MV X-rays.