Modelagem computacional de tomografia com feixe de prótons / Computational modeling of protons tomography

AUTOR(ES)

Olga Yevseyeva

DATA DE PUBLICAÇÃO

2009

RESUMO

In the present work a preliminary research via computer simulations was made in order to elaborate a prior program for the first experimental pCT setup in Brazil. Proton therapy is a high precise form of a cancer treatment. Treatment planning nowadays is performed basing on X ray Computer Tomography data (CT), alternatively the same procedure could be performed using proton Computer Tomography (pCT). Some important questions, as a scale effect and so called Calibration Curve (as a source of primary data for pCT treatment planning) were studied in this work. The 19.68MeV; 23MeV; 25MeV; 49.10MeV e 230MeV protons passage through varied absorbers (water, aluminum, polyethylene, gold) were simulated by such popular Monte Carlo packages as SRIM and GEANT4. The simulation results were compared with a theoretic prevision based on approximate solution of the Boltzmann transport equation and with simulation results of the other popular Monte Carlo code MCNPX. The comparative analysis of the simulations results with the experimental data published in scientific literature for thick absorbers and within the energy range used in the pCT measurements was made. It was noted in spite of the fact that all codes showed similar results some nonsystematic displacements can be observed. Some important observations about the codes precision were made and a necessity of the systematic measurements of the proton stopping power in thick absorbers was declared.

ASSUNTO(S)

código geant4 monte carlo simulations código srim simulações monte carlo tomografia com prótons (pct) monte carlo method engenharia nuclear proton computer tomography (pct) tomografia computadorizada métodos de simulação método de monte carlo modelagem computacional geant4 code computer simulation proton beams - tomography feixes de prótons tomografia computadorized tomography - simulation methods srim code

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