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Ictal and interictal electric source imaging in pre‐surgical evaluation: a prospective study

Accurate localization of the epileptic focus is essential for surgical treatment of patients with drug‐resistant epilepsy. Electric source imaging (ESI) is increasingly used in pre‐surgical evaluation. However, most previous studies have analysed interictal (II) discharges. Prospective studies comparing the feasibility and accuracy of II and ictal (IC) ESI are lacking.