Comissionamento e validação do feixe de alta taxa de dose no acelerador Trilogy™ no INCA para tratamentos hipofracionados com correção de heterogeneidade

Abstract

Due to the José Alencar National Cancer Institute's demand for the number of patients treated with radiosurgery and hypofractionated techniques, the high-dose-rate beam data allows the configuration of the planning system. The CIRS electron density phantom allows the accomplishment of the HU to relative electron density curve. While the BluePhantom2, a motorized 3D simulator associated with an IC15 ionization chamber and diode type detector, surveyed the beam measurements. During the data, the survey was used the TRS-483 protocol formalism for small fields. The algorithm in the planning system is the AAA algorithm (version 13.6.23), and it modeled the treated data and the output factors table. The validation process ranged from measurements from simplified geometry configurations to more elaborate configurations in anthropomorphic simulators. The average deviation found between the absorbed dose calculation in the TPS and the measurements was -0.11% with a standard deviation of 0.31%, allowing us to consider that the commissioning was satisfactory and the beam was considered suitable for patient treatment.