Independent Dose Calculation when External Radiotherapy Cancer Patient Planning

Abstract

Purpose: Independent dose calculation (IDC) and quantitative processing of the calculating the 3D
 CRT, IMRT, RapidArc results of patients irradiation plans was conducted. Criteria for passing the exposure plans for the implementation of radiation therapy was developed.
 Materials and methods: An independent manual dose calculation of patient exposure plans was performed using 3D CRT, IMRT and RapidArc techniques. Discrepancies were obtained for three groups of
 patients: 3D CRT group contained 1584 patients, the group of patients who received IMRT included
 647 patients. The patient group, in which rotary mode RapidArc was performed, included 364 patients.
 Results: As the analysis result of the IDC for 3D CRT, IMRT, RapidArc technologies, the quantitative indicators were ranked. The allowable discrepancies between the dose IDC and the dose calculated by the
 TPS were proposed for consideration: for 3D CRT technology from –5 to +10 %, for IMRT from 1.5 to 6
 times, for RapidArc from 1, 5 to 2.5 times. Outside the specified intervals, it is necessary to check and
 reschedule plans or conduct verification.