Desenvolvimento de um sistema postal para controle de qualidade de dosimetrias realizadas em feixes de fotons produzidos em aceleradores lineares de uso clinico

AUTOR(ES)
DATA DE PUBLICAÇÃO

1984

RESUMO

There are a great number of parameters involved in the performance of a clinical linear accelerator. These parameters must be verified periodically to eliminate errors in the treatment performed. Such verifications are usually made by clinical physicists with special equipment?s. With the intent of helping and optimizing the physicists work, the organizations responsible for the control and utilization of ionizing radiation?s have conducted a number of studies. A result of these studies led to the implementation of a postal system for, the verification of the dosimetry of clinical irradiators and of their parameters which are relevant to the success of, radiotherapy. The system developed to be used in the quality assurance of linear accelerators only, verifies the absorbed depth dose given by these machines. In this work a different system is proposed which is able to verify the absorbed depth dose given at two different depths, the irradiation field homogeneity and its coincidence with the light field of the machine, the source to surface distance used and the beam nominal energy. These radiation field parameters are very important in the tumour treatment and they may help in the determination of the error sources of the absorbed depth dose. The system developed uses a water phantom, LiF thermoluminescent dosimeters and a radiographic film to evaluate such parameters. The postal system developed in this work has been tested in linear accelerators of 4 to 18 MV with good results

ASSUNTO(S)

radiação - dosimetria radioterapia radiação ionizante

ACESSO AO ARTIGO

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