The locally orthogonal coordinate systems for analyzing inverse problems of magnetostatic fields-applications to magnetocardiogram and magnetoencephalogram

The authors previously proposed the sampled pattern matching (SPM) method to analyze inverse problems in magnetostatic fields. Because of current dipole angle subdivisions, the SPM method essentially requires considerable CPU time. In order to remove the current dipole angle subdivisions, the authors propose a formulation of the SPM method using cylindrical and spherical coordinate systems. Applications of this faster SPM method to the magnetocardiogram (MCG) and magnetoencephalogram (MEG) identify the heart defect and activated brain parts, respectively