Evaluación de la interacción entre un haz de rayos x diagnóstico con un fantoma de PMMA empleando GATE

Abstract

The determination of the dose is traditionally done by using phantoms and detectors (thermoluminescent dosimeters and / or ionization chambers), but advances in technology have allowed the same data to be obtained through the simulations; From this perspective it is possible to use various software such as GATE, which was initially adapted to determine the dose absorbed in nuclear medicine treatments from Monte Carlo simulations. In this work we present the results obtained when using GATE to determine the dose that would be received per patient, both in surface and at different depths, when it is subjected to a radiodiagnosis procedure with conventional x-rays; for this, the multilayer Fantoma designed in the FIACIBI group was used, which was simulated in the program. Detectors are placed in each of the layers of the fantoma to determine the dose at different depth levels. The source of radiation is considered punctual and that it emits a beam of conical radiation. The radiation spectrum is calculated taking into account the kilovoltage, the angle of the anode and the characteristics of the x-ray tube. The methodology implemented allows analyzing and optimizing the protocols for obtaining the image in order to verify compliance with the diagnostic reference levels.