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Master's Dissertation
DOI
10.11606/D.85.2016.tde-19012016-132131
Document
Author
Full name
Jessica Luvizotto
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Yoriyaz, Hélio (President)
Fernandes, Marco Antonio Rodrigues
Shorto, Julian Marco Barbosa
Title in Portuguese
Caracterização do filme radiocrômico GAFCHROMIC modelo EBT3 para uso em braquiterapia
Keywords in Portuguese
braquiterapia
dosimetria
filmes radiocrômicos EBT3
método de Monte Carlo
Abstract in Portuguese
A braquiterapia é a modalidade de tratamento radioterápico que utiliza fontes radioativas seladas a uma distância curta do tumor, diminuindo o risco de aplicação de uma dose indesejável em tecidos sadios adjacentes. Para que a braquiterapia seja confiável, é necessário estabelecer um programa de práticas dosimétricas visando a determinação da dose ideal de radiação para esta prática radioterápica. Neste trabalho apresenta a aplicação de duas metodologias destinadas à dosimetria utilizando filmes radiocrômicos. Medidas experimentais foram realizadas com filmes EBT3 em objetos simuladores composto de material homogêneo e heterogêneo (pulmão, osso e tecidos moles) construídos especialmente para medidas de dose em braquiterapia. Os processamentos e analises das imagens resultantes do procedimento experimental foram realizados com o software IMAGEJ e MATLAB. Os resultados foram avaliados a partir de comparações medidas experimentais de dose e obtidas por simulações pelo Método de Monte Carlo.
Title in English
Characteristics of the film radiochromic gafchromic EBT3 model for use in brachytherapy
Keywords in English
brachytherapy
dosimetry
Monte Carlo method
radiochromic movies EBT3
Abstract in English
Brachytherapy is a radiotherapy treatment modality using radioactive sealed sources within walking distance of the tumor, reducing the risk of applying an unwanted dose to adjacent healthy tissues. For brachytherapy is reliable, it is necessary to establish a dosimetric practices program aimed at determining the optimal dose of radiation for this radiotherapy practice. This paper presents the application of two methodologies for the dosimetry using radiochromic movies. Experimental measurements were performed with EBT3 movies phantoms consisting of homogeneous and heterogeneous material (lung, bone and soft tissue) built especially for dose measurements in brachytherapy. The processing and analysis of the resulting images of the experimental procedure were performed with ImageJ software and MATLAB. The results were evaluated from comparisons dose of experimental measurements and simulations obtained by the Monte Carlo method.
 
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Publishing Date
2016-02-03
 
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