A measurement system for evaluating electrical properties of flowing blood

Abstract

Electrical properties of blood can be isotropic (described by a scalar) or anisotropic (described by a tensor). Moreover, they depend on electric field frequency, state of motion, shape of the vessel, assuming that the morphology of blood is fixed during measurements. A measurement system for evaluating electrical properties of blood flowing in compliant vessel has been developed. It enables measurements of real and imaginary parts of complex conductivity and their changes induced by e.g. different velocity of blood flow. Measurements can be done simultaneously in two directions, perpendicular each to other. It has been achieved by electrical isolation of measurement channels and slightly different frequency of electrical current. A special measurement cell has been developed.