Influência de blindagens de sala de radioterapia na dose efetiva de pacientes submetidos ao tratamento de câncer de próstata

Abstract

This paper presents an analysis of the influence of the shields of the radiotherapy room on the doses received by the organs/tissues adjacent to the target tumor. The development of the work was carried out by computationally simulating a Varian Clinac 2300/CD accelerator (15 MV), a radiotherapy room and an anthropomorphic phantom in voxels. The simulation of the linear accelerator was carried out based on the information of documents provided by the manufacturer Varian and validated, comparing the simulated results to those obtained by the Golden Data issued by the manufacturer. The doses used for throttle validation were obtained at 4x4 cm2 , 10x10 cm2 and 20x20 cm2 openings where the deep dose and lateral dose profiles were evaluated, taking into account the acceptance criteria described in the literature. Subsequently, the influence of shields on equivalent and effective doses was evaluated in a patient undergoing prostate radiotherapy. The addition of steel and lead to shielding showed that the materials contribute in a tiny way to the doses in the patient. The data obtained were compared with the literature, indicating that the dose distribution in tissues adjacent to the tumor is lower with increased energy of the therapeutic beam.