According to the recent EU Council Directive 2013/59/Euratom, information relating to patient exposure forms part of the report of the medical radiological procedure, this requirement will help to avoid deterministic effects on the skin, and patient follow-up. The main goal of the project is the development of a Monte Carlo-based method to assess patient doses, in particular by using the MC-GPU code (based on the physics of the PENELOPE code). The main characteristic of the MC-GPU code is that runs using graphic processing units (GPU), allowing to obtain results in a very fast way. To reach the proposed objective the project will address the optimization and automatization of the code as well as its validation against standard CPU-based codes.