Fuzzy sets and their application in medicine

In the last couple of decades intelligent systems have appeared in many technical areas, such as consumer electronics, robotics and industrial control systems. Many of these intelligent systems are based on the fuzzy set theory which describes complex systems mathematical model in terms of linguistic rules. Fuzzy set theory and fuzzy logic, which was founded in 1965 by Lotfi A. Zadeh, are a highly suitable and applicable basis for developing systems in medicine. This paper surveys the utilisation of the fuzzy set theory of two research areas, i.e. fuzzy relations and fuzzy control in medical sciences in general, as well as on three concrete medical fuzzy applications.