Boundary Influence on MCG Sparse Inverse Problem

Abstract

In this paper, we discuss the influence for MCG (magnetocardiography) sparse inverse problem when conductivity uncertainty exists, through a heart- torso model by boundary element method. Fixed and moving current dipoles are designed in order to study the influence of cardiac conductivity on source reconstruction. Two indicators including the position error and the reconstructed source mean distance are used to evaluate the results. The simulating results demonstrate that the index of dipole source reconstruction outside the heart is better than that inside the heart, that is, the complicated conductivity has a greater impact on source reconstruction. In addition, the position error of the source by modified FOCUSS reconstruction is close to that of the fast greedy sparse method, and sometimes better than the latter.