Séminaires des Doctorants 2016: R. Fabbro

Tuesday 29 Mar 2016, 10:30 → 11:00 Europe/Paris

Grand Amphithéâtre

10h30: Présentation de Robin Fabbro

Developments and simulation around a detector dedicated to the quality assurance in radiation therapy

Abstract:

Quality assurance is a key topic in clinical radiation therapy. The possible mistakes are numerous (human, machine, etc…) and various devices have been developed to help the medical physicist to perform as clean verification procedures as possible. However, those devices come with several drawbacks, and the salvation seems to come from bi-dimensional detectors located upstream of the patient. In this context, the PHYSMED group of the LPSC is developing TraDeRa, a pixelated matrix of ionization chambers with embedded electronics. The detector is able to provide a real-time map of the photon flux right after the medical linear accelerator.
Nevertheless, the raw electrical charges collected by the detector have to be processed to provide medical observables. In other words, one has to “translate” the given signal map into a relative dose map, which isn’t trivial and can only be achieved with very accurate Monte Carlo simulations.
I will first introduce the basics of quality assurance in clinical radiation therapy, and present some of the solutions already available for the medical physicist. Then, I will talk about the simulation mandatory to calibrate the response of the detector in terms of dose, and the importance to reproduce as precisely as possible a reference medical accelerator. I will finally present the last developments and measurements campaign dedicated to the improvement of the detector features.

Talk: français, slides: anglais

 

Transparents Seminaire_Doctorant_Robin_FABBRO_2016_V1_.pdf