Determination of Tissue Properties Based on Modeling and Electrical Impedance Registration

In this paper we consider the determination of the electrical characteristics of tissues using physical simulations based on the finite element method with anatomical geometry in conjunction with electrical impedance measurements. Simulated anatomical geometry was constructed based on MRI of the volunteers’ forearms. The electrical impedance around the limb was recorded to obtain real values, based of which the specific resistance of the tissues in the studied area was determined. The minimum error that the models give when measuring electrical impedance values is about 20%. Using the developed physical model, the dependence of the change in electrical impedance on the change in the electrical characteristics of tissues that occurs during the execution of an action was investigated. The results showed that with the same change in tissue resistivity, the skin-fat layer makes a greater contribution to the electrical impedance value. An increase in the specific resistance of the muscle layer by 10% leads to an increase in the impedance by 1-2 Ohm, which corresponds to a change in the impedance when making a movement.