Fig. 4

Ictal MEG localization, comparison of minimum norm estimation (MNE) with FCD [28]. a MEG at time of seizure onset (arrow). b Morlet wave transformation. c Mapping of current density of the narrow band identified in b. d Localization in the precentral gyrus by equivalent current dipole (ECD) analysis (upper row), and localization in the anterior edge of the prior resection (21.8 mm to ECD) by L2 MNE solution (lower row). e Postsurgical resection of the area delineated by L2-MNE narrow band. The MNE solution was in the resection cavity. f L2-MNE solution, the ECD localization was 21.8 mm more posterior. Only the MNE localization was within the resection cavitiy