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Master's Dissertation
DOI
10.11606/D.85.2006.tde-03052012-103720
Document
Author
Full name
Cristiane Barsanelli
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Rodrigues, Laura Natal (President)
Carvalho, Heloisa de Andrade
Rodrigues, Letícia Lucente Campos
Title in Portuguese
Métodos para implementação da dosimetria in vivo (dose de entrada) com dosímetros termoluminescentes na radioterapia externa com feixe de fóton
Keywords in Portuguese
dose de entrada
dosimetria in vivo
dosimetria termoluminescente
Abstract in Portuguese
Neste trabalho, estão descritos os métodos de seleção, calibração e de determinação dos fatores de correção, as características físicas dos dosímetros termoluminescentes, o procedimento de cálculo para converter a leitura do dosímetro em dose absorvida e a metodologia para se determinar a dose de entrada. Foram investigadas a praticidade e a utilidade das medidas de dose de entrada com os dosímetros termoluminescentes, bem como a exatidão e a reprodutibilidade no fornecimento da dose diária. As medidas de dose de entrada foram realizadas em cinco pacientes com diagnóstico de câncer de mama tratadas com um feixe de fótons de 6 MV. Não foram detectados grandes desvios entre a dose medida e a dose esperada (os valores concordaram em ± 5%), devido à excelente estabilidade do equipamento de tratamento, ao sistema automático de verificação e à boa exatidão no ajuste diário do tratamento. Uma boa precisão pode ser alcançada quando os fatores de correção para cada parâmetro de influência na resposta do dosímetro são cuidadosamente determinados e aplicados para converter o sinal termoluminescente em dose absorvida. O estudo demonstrou a viabilidade do uso dos dosímetros termoluminescentes para a dosimetria in vivo e sua utilidade como parte de um programa de garantia de qualidade em um serviço de radioterapia.
Title in English
Methods for implementation of in vivo dosimetry (entrance dose) using thermoluminescent dosimeters during radiotherapy treatment with photon beam
Keywords in English
dosimetry
in vivo
mmary glands
neoplasm
photon beams
radiotherapy
thermoluminescent dosimetry
Abstract in English
Selection, calibration procedure to convert TLD signal into absorbed dose and physical characteristics at the thermoluminescent dosimeters, as well as the determination of correction factors and the methodology to determine expected entrance dose, are described in this work. Practical aspects and the utility of entrance dose measures with thermoluminescent dosimeters were investigated, as well as the exactness and the reproducibility of the daily dose release. The entrance dose measures were performed in five patients with diagnosis of breast cancer treated with a 6 MV photon beam. The measured dose and the expected dose values agreed in ± 5%, due to excellent treatment equipment stability, to automatic verification system and the good exactness in the daily treatment adjustment. Good precision can be achieved when the correction factors for each parameter of influence in the dosimeter response are carefully determined and applied to convert the thermoluminescent signal into absorbed dose. The study demonstrates the viability of thermoluminescent dosimeters use for in vivo dosimetry and its utility as part of a quality assurance program in a radiation therapy service.
 
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Publishing Date
2012-05-07
 
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