Optimization of radiation therapy in prostatic cancer

The results of a study on optimizing external irradiation of prostatic cancer are discussed. The study was performed with the aid of an automatic water phantom, an automatic densitometer, and a computerized treatment planning system using anthropometric phantom Alderson. The following parameters were studied: Dose gradient, the size of areas of selected isodoses, and the shape of the 90% isodose. At present, we consider that the two-sector biaxial arc technique characterized by an arc angle of 120deg, a distance of the arc axes of 3 cm, employing a 20 MeV X-ray of a linear accelerator is considered to be the optimal technique for target irradiation of carcinomas of the prostate. (author). 4 figs., 1 tab., 19 refs