Accuracy of the Body Surface Potential Approximation

The problem of construction of body surface potential maps (BSPM) is important for many aspects of clinical practice. This study compares several methods of BSPM approximation, including three variants of spherical harmonics approximation and two variants of Laplacian interpolation. The methods were evaluated for their accuracy using tomographic and electrophysiological studies, as well as the results of computer modeling. The accuracy measures were locally estimated giving the distribution of these measures over the whole body and their variation during the cardiac cycle. Recommendations on the method implementation and proposals for further research are formulated.