Scalp potential and current density mapping with an enhanced spherical spline interpolation

A method for producing rapid and accurate scalp electroencephalography, evoked potential and current density mapping is described. This method is based on the spherical spline interpolation, which has been validated as the most suitable function for this application. In comparison with the basic algorithm, the proposed technique is accurate and fast: it reduces the computation time by a factor of 10, while preserving the desired precision level. Furthermore, we study the choice of an optimal configuration and number of electrodes in order to produce a good reconstruction of brain electrical activity with this method. The implementation and application of this enhanced method in a three-dimensional brain mapping system is shown.