MCMEG
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2020
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Radiation Physics and Chemistry
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The improvement of the Monte Carlo (MC) community skills on computational simulations in Medical Physics is
crucial to the field of radiotherapy as well as radiology. The Monte Carlo Modelling Expert Group (MCMEG) is an
expert network specialized in MC radiation transport modelling and simulation applied to the radiation protection
and dosimetry research fields. The MCMEG addressed a multigroup dosimetric intercomparison exercise
for modelling and simulating a case of prostate radiation therapy (RT) protocol. This intercomparison was
launched in order to obtain the dose distribution in the prostate target volume and in the neighboring organs.
Dose assessments were achieved by using TLDs. A protocol using two pair of parallel-opposed fields were
planned and performed with Alderson-Rando Pelvic Phantom. The assessed organs at risk were the urinary
bladder, rectum and right and left femur heads. The RT simulations were performed using the MCNPx, MCNP6
and egs++ and BEAMnrc/DOSXYZnrc modules of EGSnrc Monte Carlo codes. The dose to the target volume,
mean doses and standard deviation in the organs at risk, and dose volume data were computed. A comparison
between the simulated results and the experimental values obtained from TLD measurements was made. In some
cases the results obtained using MC simulations showed large deviations in comparison to the results obtained
from the TLD measurements and these variations can be explained by the difficulties in the modelling of the
geometry, selection of MC parameters required for the simulations and the statistical errors and inaccuracies in
experimental measurements. Even though, the exercise has been a great opportunity for the MC groups to learn
and share the main difficulties found during the modelling and the analysis of the results. Concerned to the
obtained variations, the MCMEG team consider that this was expected for the level of complexity of the exercise
and must be studied by the MC groups.
Como referenciar
FONSECA, T.C.F.; ANTUNES, P.C.G.; BELO, M.C.L.; BASTOS, F.; CAMPOS, T.P.; GERALDO, J.M.; MENDES, A.M.; MENDES, B.M.; PAIXÃO, L.; SANTANA, P.C.; SENIWAL, B.; SQUAIR, P.L.; YORIYAZ, H. MCMEG: intercomparison exercise on prostate radiotherapy dose assessment. Radiation Physics and Chemistry, v. 167, p. 1-7, 2020. DOI: 10.1016/j.radphyschem.2019.04.045. Disponível em: http://repositorio.ipen.br/handle/123456789/30449. Acesso em: 25 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.