CRITERIA FOR EVALUATION OF DOSIMETRIC VERIFICATION OF RADIOTHERAPY HIGH-TECH TREATMENT PLANS FOR CANCER PATIENTS

To test the effectiveness of the dose delivery system of the treatment plan in intensity modulated radiation therapy, quality assurance systems are used. The main tool for verifying the correspondence between the reference and the estimated dose distribution is Y—indexing. In the process of Y—analysis of individual dose distributions, both point dose values and geometrical offset between the reference and delivered distributions are evaluated. To check the compliance of dose distributions, the concepts of action limits and tolerances are used. The action limits are defined as the total percentage of the estimated value by which deviation of the indicators checked by the quality assurance system is allowed, with a minimal risk of harm to the patient. Tolerances are defined as the boundaries of the magnitude change within which the treatment process is considered to be performed according to the prescribed conditions.