A.N. Tikhomirov - Assistant, Department of Medical and Technical Information Technology (BMT-2), Bauman Moscow State Technical University E-mail: aleksey.tihomirov@gmail.com A.I. Malakhov - Assistant, Department of Medical and Technical Information Technology (BMT-2), Bauman Moscow State Technical University E-mail: aimalakhov@bmstu.ru S.I. Shchukin - Dr.Sc. (Eng.), Professor, Head of Department of Medical and Technical Information Technology (BMT-2), Bauman Moscow State Technical University E-mail: schookin@mx.bmstu.ru

A mathematical model, which represent the heart in the chest as sphere in homogeneous half space, has been proposed to estimate the wall motion of heart by means of electrical impedance measurements.This method has several limitations,the fat layer in patients is one of the main limitations. An assumption was made about the influence of the skin-fat layer, its resistivity exceeds the resistivity of muscle tissue, by electrical impedance precordial research.In this paper studied this assumption, and estimated error caused by them. The research based on comparing the results of computing using the proposed mathematical model with the results obtained by numerical modeling using the finite element analysis ANSYS. The paper presents the results of a methodology that takes into account the contribution of the fat layer in precordial electrical impedance measurement. It was determined that when the thickness of the fat layer by 20 mm the accuracy of determining the displacement can reach 50%. The proposed method of compensation of influence of the fat layer allows to reduce the error in determining the movements of the heart ventricles walls to 7%.

 

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