An open database of EEG data from child epilepsy with postoperational foci localization at eeg.pl/epi
Spatial localization of brains electrical activity measured from the skull surface (EEG) is one of the most important and unresolved problems of contemporary electroencephalography. Apart from the inherent non-uniqueness of the inverse problem, there is a great amount of parameters influencing localization errors, like the tissue geometry in the forward model, localization of electrodes, anisotropy of the tissue etc. Assesment of the accuracy and applicability of such solutions is an extremely complicated problem, which requires availability of a large amount of well documented and freely available data. In certain types of epilepsy, removal of the epileptogenic zone within the brain tissue is the only possible therapy due to drug-resistance. However it is still very difficult to delineate the exact localization of the epileptogenic zone without invasive EEG registration. We present first 20 cases of severe epilepsy cases diagnosed and operated for intractable epilepsy with intraoperative ECoG. These cases provide also unique possibility of verification of the accuracy of the Inverse Solutions computed from the pre-operational surface EEG, owing to the availability of intracranial recordings from the same patients, aimed at foci localization, and post-operational assessment.