In this paper we present a new method of medical diagnostics on the basis of computer reotomography. We have created a model of forearm. We have calculated the distribution of electrical potentials at the level of the forearm mean section in terms of theoretical approach on the basis of finite elements method. Information parameters of computer reotomography was found, it is the aspect of potentials distribution function. Our model calculations, which showed a qualitative agreement with experiments, make it possible to use the method of computer reotomography to detect the pathology of the organ under study.