Study of the impact of artificial articulations on the dose distribution under medical irradiation.
Fiche publication
Date publication
février 2005
Auteurs
Membres identifiés du Cancéropôle Est :
Pr GSCHWIND Régine
Tous les auteurs :
Buffard E, Gschwind R, Makovicka L, Martin E, Meunier C, David C
Lien Pubmed
Résumé
Perturbations due to the presence of high density heterogeneities in the body are not correctly taken into account in the Treatment Planning Systems currently available for external radiotherapy. For this reason, the accuracy of the dose distribution calculations has to be improved by using Monte Carlo simulations. In a previous study, we established a theoretical model by using the Monte Carlo code EGSnrc [I. Kawrakow, D.W.O. Rogers, The EGSnrc code system: MC simulation of electron and photon transport. Technical Report PIRS-701, NRCC, Ottawa, Canada, 2000] in order to obtain the dose distributions around simple heterogeneities. These simulations were then validated by experimental results obtained with thermoluminescent dosemeters and an ionisation chamber. The influence of samples composed of hip prostheses materials (titanium alloy and steel) and a substitute of bone were notably studied. A more complex model was then developed with the Monte Carlo code BEAMnrc [D.W.O. Rogers, C.M. MA, G.X. Ding, B. Walters, D. Sheikh-Bagheri, G.G. Zhang, BEAMnrc Users Manual. NRC Report PPIRS 509(a) rev F, 2001] in order to take into account the hip prosthesis geometry. The simulation results were compared to experimental measurements performed in a water phantom, in the case of a standard treatment of a pelvic cancer for one of the beams passing through the implant. These results have shown the great influence of the prostheses on the dose distribution. (C) 2004 Elsevier B.V. All rights reserved.
Référence
Nucl Instrum Methods Phys Res Sect B-beam Interact Mater Atoms. 2005 Feb;229(1):78-84.