Research on Biomedical Engineering
http://www.rbejournal.periodikos.com.br/article/5889fbac5d01231a018b4735
Research on Biomedical Engineering
Original Article

UM SISTEMA ESPECIALISTA EM MEDICINA TROPICAL UTILIZANDO QUANTIFICAÇÃO DA INCERTEZA

AN EXPERT SYSTEM FOR TROPICAL MEDICINE

Silva, R.; Infantosi, Antonio Fernando Catelli; Chacn, P.M.L

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Resumo

Um Sistema de Apoio ao Diagnóstico em Medicina Tropical foi desenvolvido usando técnicas de quantificação linguistica na representação do conhecimento e 'teoria da confirmação' na modelagem do mecanismo de inferência. Para permitir que as medidas de crença e descrença aumentem ou diminuam durante o processo de inferência, foram consideradas as percentagens de respostas congruentes e incongruentes. O Sistema inclui 59 doenças infectoparasitárias, 565 des critores e suas frequências de ocorrência. A avaliação inicial do Sistema, efetuada através de 10 casos clinicos reais, sugere 70% de sensibilidade diagnóstica.

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Abstract

This work aims to develop a computer based diagnostic consultant system in tropical medicine. For this purpose, linguistic expressions were quantified, and confirmation theory was applied to model the inference mechanism. Considering the percentage of congruent and incongruent answers, the measures of belief and disbelief were modified. Thus, these measures can increase or decrease during the inference process .Whith this system, the diagnosis of 59 infectious-parasitical diseases can be done. The knowledge base contain 565 signals, sympthoms and exams, and their correspondent frequency of occurrences, which caracterize the whole set of diseases considered. An initial evaluation of the system based on 10 clinical cases suggests a sensitivity of 70%.
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