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In this study, cardiac source localization was simulated using the spatial filter method. Three types of spatial filters were obtained using the standardized low-resolution brain electromagnetic tomography (sLORETA) method, based on different examination procedures. In Type A filter, the examination was conducted at the front of the torso. In both Type B and Type C filters, the examinations were conducted at the front and back of the torso; however, the distance from the frontal observation plane to the center of the heart model was different for each type. In the simulation experiments, first the goodness of fit (GOF) value was introduced to determine the proper threshold for each spatial filter. Then, single and multiple dipole sources were simulated at different depths with and without noise. The extension of the solutions computed using these spatial filters was investigated. Finally, the performances of these spatial filters, with the corresponding averaged thresholds, were evaluated using the GOF. Type B and Type C spatial filters demonstrated reduction in the extension of source dependency on source depth and improvement in the accuracy of source localization with noisy data.

Simulation of Extended Source Localization using sLORETA Method for Magnetocardiography