ANALYSIS OF THE INFLUENCE OF SELECTING THE ELECTRODES NUMBER ON RESULTS OF RECONSTRUCTION OF ELECTRICAL POTENTIAL DISTRIBUTION ON THE EPICARD SURFACE 

Kramm Mikhail Nikolaevich, candidate of technical sciences, professor, sub-department of radio engineering fundamentals, National Research University «MPEI» (14 Krasnokazarmennaya street, Moscow, Russia), E-mail: KrammMN@mail.ru 

615.47:616–072.7 

10.21685/2227-8486-2020-1-6 

Subject and goals. The aim of this study is to increase spatial resolution in the analysis of the heart electrical activity by reconstructing the maps of the electric potential distribution on the epicardium surface. The electrocardiograms of the multi-electrode system on the human torso surface and the geometric characteristics of the torso surface are used. We consider the influence of the choice of the electrodes number on the results of reconstruction of the electric potential distribution map on the epicardium surface. Using the model object, as an example, we compare the electric potential maps obtained by reconstruction according to potentials on the torso surface and the maps obtained by direct calculation. The study is relevant in the tasks of increasing the information content of electrocardiographic examinations by reconstructing the parameters of an equivalent electric heart generator (EEHG).
Methods. In the framework of the model of heart electrical activity with inhomogeneities of various sizes, we analyze maps of the electric potential distribution on the epicardium, obtained by solving the inverse problem under potentials, recorded on the torso surface.
Results and conclusions. We present the results of comparing electric potential maps on the epicardium surface, obtained by reconstruction according to potentials on the torso surface, and the maps, obtained by direct calculation. The influence of the choice
of the electrodes number on the results of reconstruction of the electric potential distribution map on the epicardium surface is considered. Estimates of the number of electrodes for various sizes of inhomogeneities in the potential distribution are obtained. The number of electrodes required for recording the potential and the optimal regularization coefficient substantially depend on the size of the inhomogeneity on the potential distribution map. For reconstruction of inhomogeneities of 3 cm or more in size, a sufficient number of electrodes is of the order of 40, for smaller inhomogeneities – up to 60 or more. 

electric potential distribution map, electrodes, torso, epicardium, reconstruction, regularization coefficient