THE EFFECT OF POSITIONING ACCURACY OF CANCER PATIENTS ON THE PARAMETERS OF THE INDIVIDUAL THREE-DIMENSIONAL DOSE DISTRIBUTION DELIVERED TO THEM

For the correct application of high-tech methods of radiation therapy, it is necessary to use strict requirements for the technical and dosimetric parameters of radiotherapy equipment, the accuracy of adjustment and calibration of its geometric, mechanical and radiation parameters. To determine the values of possible errors in patient positioning during radiation treatment, the authors considered the design and characteristics of typical RTS, developed a model of the patient’s «average» body, which allows changing the load on the TP RTS with a step of 1 kg. The parameters of the TP position were determined for the main types of localizations of radiation therapy for malignant neoplasms. Numerical values of deviations of the radiation beam isocenter from the treatment couch prescribed horizontal position were experimentally established for a load on it from 40 to 180 kg for treatment couch used for patients’ treatments in N.N. Alexandrov National Cancer Centre of Belarus.