Elaboração e implementação de um programa para aplicação do método de Clarkson em radioterapia / Elaboration and implementation of one program for application of the method of Clarkson in radiotherapy

AUTOR(ES)

Adriano Luiz Balthazar Bianchini

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

11/03/2011

RESUMO

Radiotherapy has a fundamental part that is the patient treatment planning. For its success, the medical physicist has to use physical parameters based on the radiation interaction with the matter, in this case the patient; in order to determine the radiation absorbed dose in the selected target volume. The physical parameters normally are related to regular radiation field sizes, although irregular fields can be also used in some treatments. To overcome this problem there are methods that convert irregular fields in regular fields, such as a square one. For small fields the Sterling\ s Method (technique to calculate equivalent square fields making use of ratio four times the effective area of irradiation by is perimeter) can be used. However, this method is not adequate for large irregular field. In this case, the Clarkson\ s Method is used. The Clarkson\ s Method uses values functions, such as Scattering-Air Ratio (SAR) and Tissue-Air Ratio (TAR), related with radiation interaction of with matter, to determine equivalent square fields from those large irregular ones or to calculate the radiation absorbed dose in the point of interest in a patient The application this method takes time, once it needs a considerable time from the medical physicist attention and also from the equipment. In this work, a software was developed to analyse digital images of large irregular fields, such as fields found in treatment of Hodgkin\ s disease (mantle) correlating them to regular equivalent fields. The uncertainty between the manual Clarkson and the programmed was inferred as ( -0,52 ± 0,60 )%, what can validate the program developed.

ASSUNTO(S)

clarkson s method doença de hodgkin. hodgkin s disease. método de clarkson radioterapia radiotherapy

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