TITLE

Simulação computacional de um feixe de fótons de 6 MV em diferentes meios heterogêneos utilizando o côdigo PENELOPE

AUTHOR(S)
Salata, Camila; Sibata, Claudio Hissao; Ferreira, Nadya Maria; de Almeida, Carlos Eduardo
PUB. DATE
July 2009
SOURCE
Radiologia Brasileira;jul/aug2009, Vol. 42 Issue 4, p249
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The PENELOPE code was utilized to simulate irradiation geometries where heterogeneities are present and to simulate a photon beam behavior under these conditions. MATERIALS AND METHODS: For the homogeneous case, the ionizing radiation behavior was simulated only with water, and different materials were introduced to simulate heterogeneous conditions. Cubic geometries were utilized for the homogeneous phantoms, and parallelepiped-shaped geometries for the heterogeneities with the following composition: bone and lung tissue simulators, as recommended by the International Commission on Radiological Protection, and titanium, aluminum and silver. Input parameters were defined as follows: energy and type of source, 6 MV photons; source-surface distance=100 cm; and radiation field of 10×10 cm2. RESULTS: Percentage depth-dose curves were obtained for all the cases. As result, it was observed that for high electronic density materials, such as silver, the absorbed dose is higher than the absorbed dose in the homogeneous phantom, and for the lung tissue simulator, it is lower. CONCLUSION: Results clearly demonstrate the relevant role of heterogeneities in the treatment planning system algorithms utilized in the calculation of dose distribution in patients, increasing the accuracy of the dose delivered to the tumor and avoiding unnecessary irradiation of healthy tissues.
ACCESSION #
44451582

 

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