Modeling an EPID to simulate radiotherapy transmission images

Abstract

During an oncological treatment with external-beam radiotherapy, it is essential to avoid any movement or displacement of the patient. To guarantee this, modern medical accelerators are equipped with a device called EPID, capable of detecting the radiation that passed through the patient and create an image. The aim of this paper is to model a realistic geometry of an EPID to simulate radiotherapy transmission images and test if these changes in the considered geometry produce more useful and closer to reality dose distribution images. To do so, Monte Carlo simulations were done using the PENELOPE/penEasy code to simulate the transport of photons, and the images were analyzed employing the gamma index method