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This paper describes an application of the equivalent multipole moment method (EMMM) with polar translations to calculation of magnetic fields induced by a current dipole placed in a human head model. Although the EMMM is a conventional Laplacian field solver based on spherical harmonic functions, the polar translations enable it to treat eccentric and exclusive spheres in arbitrary arrangements. The utilized head model is composed of seven spheres corresponding to skin, two eyeballs, skull, cerebral spinal fluid, grey matter, and white matter (See Fig. 1). First, the magnetic flux linkage Φ with a loop coil nearby the model is calculated by the following equations.

Application of Equivalent Multipole Moment Method with Polar Translations to Forward Calculation of Neuromagnetic Fields