Use of MOSFET to verify and validate Monte Carlo radiation treatment calculation in an anthropomorphic phantom

Autores UPV
Año
CONGRESO Use of MOSFET to verify and validate Monte Carlo radiation treatment calculation in an anthropomorphic phantom

Abstract

Radiation therapy treatment planning based on Monte Carlo simulation provide a very accurate dose calculation compared to deterministic systems. Moreover, metal¿oxide¿semiconductor field effect transistor (MOSFET) dosimeters are increasingly utilized in radiation therapy. In the present work, we have used the MCNP5 (Monte Carlo N-Particle transport code) to simulate the irradiation of an anthropomorphic phantom (RANDO) with a medical linear accelerator. The detailed model of the Elekta Precise MultiLeaf Collimator using a 6 MeV photon beam was designed and validated by means of different beam sizes and shapes in previous works. This study includes in the simulation the RANDO phantom geometry. To that, a set of Computer Tomography images of the phantom was obtained via Computer Tomography and formatted. The slices are input in PLUNC software, which performs the segmentation by defining anatomical structures and a Matlab algorithm writes the phantom information in MCNP5 input deck format. The simulation has been verified and validated throughout the comparison of High-Sensitivity MOSFET dosimeter (Best medical Canada) measurements in different points inside the phantom with simulation results. On-line Wireless MOSFET provide dose estimation in the extremely thin sensitive volume, so a meticulous and accurate validation has been performed. The comparison show good agreement between the MOSFET measurements and the Monte Carlo calculations, confirming the validity of the developed procedure to include patients CT