Desenvolvimento de um fantoma para controle da qualidade em braquiterapia de alta taxa de dose com fonte de Irídio-192

Abstract

The technique of treatment called brachytherapy is a modality of radiotherapy in which the application of the dose of ionizing radiation to the patient occurs from radionuclides that, in sealed sources, are placed directly in the tumor volume (target of the treatment) or very close to this volume. This paper deals with high-dose intracavitary brachytherapy with an Iridium-192 source, aimed at the treatment of gynecological tumors. There have been many technological advances in this area in recent years, and with them, advances in quality control techniques for this treatment modality are becoming increasingly necessary. In this way, the present work has the objective to meet this need, offering a proposal of evaluation of the treatment delivered in relation to what is planned. For this, the creation of a prototype that was made in polylactic acid (PLA) using a 3D printer (fast and low cost manufacturing technology). A fundamental part of the irradiation arrangement, the phantom acts as a support for the placement of 4 parts of radiochromic film, a dosimeter widely used in brachytherapy. The methodology presented in this paper sought to investigate the capacity of the remote afterloading system to execute the treatment plan as foreseen by the computerized planning system (TPS)