Cortical Dipole Layer Imaging of Brain Electrical Activity in Horizontal and Sagittal Planes

Horizontal and sagittal dipole layer distributions were estimated from scalp electroencephalogram for three dimensional dipole imaging of brain electrical activity. Horizontal dipole layer being parallel to the brain surface has been used in previous head models. In the present study, the dipole layer distribution in the sagittal plane was also introduced to identify the position of dipole sources in three dimensions. The parametric projection filter was applied to an inverse problem in a homogeneous plane head model under various signal conditions. The present simulation results suggest that the depth information of dipole sources could be observed by the present method.