![]() ![]() Intracerebral dipole source localization for FFT power maps. Frequency domain EEG source localization of ictal epileptiform activity in patients with partial complex epilepsy of temporal lobe origin. Lantz, G., Michel, C.M., Seeck, M., Blanke, O., Landis, T. Extracranial localization of intracranial interictal epileptiform activity using LORETA (low resolution electromagnetic tomography). Lantz, G., Michel, C.M., Pascual-Marqui, R.D., Spinelli, L, Seeck, M., Seri, S., Landis, T. A simple head shape approximation for the 3 shell model. Error analysis for multisphere approximation in EEG forward and inverse problems (Abstract). A critical analysis of linear inverse solutions to the neuroelectromagnetic inverse problem. Linear and nonlinear current density reconstructions. Remond (Eds.), Methods of Analysis of Brain Electrical and Magnetic Signals. Source localization of brain electrical activity. Wyllie (Ed.), The Treatment of Epilepsy: Principles and Practice. Historical perspectives and future direction. Spike voltage topography identifies two types of frontotemporal epileptic foci. Defining epileptogenic foci: past, present, future. ![]() Realistic head models improve non-invasive EEG dipole localization of spike foci (Abstract). EEG dipole modeling in complex partial epilepsy. Adaptive cone-kernal time-frequency analysis. Butterworth-Heinemann, Boston, 1996.Ĭzerwinski, R.N. Neuroimaging in epilepsy: Principles and Practice. (Ed.), Surgical Treatment of the Epilepsies. Surgically remediable lesional syndromes. Continuous source imaging of scalp ictal rhythms in temporal lobe epilepsy. Analysis of interictal spikes was less useful than analysis of the ictal discharge.Īssaf, B.A. LORETA combined with PEFSA of the ictal discharge can localize ictal EEG discharges accurately and improve correlation with brain anatomy by allowing coregistration of the ictal generator with the MRI. Only generators of the interictal spikes that were ipsilateral to seizure onset correlated with the ictal generators. Eight of 10 patients had interictal spikes, of which 4 were bilateral independent temporal lobe spikes. In patients with frontal lobe epilepsy, the ictal generators at the time that the spectral power was maximal localized to the MRI lesions. The LORETA generators were rostral to the MRI lesion in 87% (7/8) of patients with temporal lobe lesions, but all were located in the mesial temporal lobe in concordance with the patients' MRI lesions. In addition, the generators of interictal epileptogenic spikes were identified using time-domain LORETA. The ictal generators were obtained from the scalp map using LORETA. PEFSA was used to obtain a phase-encoded scalp map for the ictal frequencies. ![]() The scalp electrodes were located in three-dimensional space using a magnetic digitizer and coregistered with the patient's MRI. Ten patients admitted to the epilepsy monitoring unit with MRI-identified lesions and intractable partial epilepsy were studied using 31-electrode scalp EEG. Patients with medically intractable partial epilepsy and well-defined symptomatic MRI lesions were studied using phase-encoded frequency spectral analysis (PEFSA) combined with low-resolution electromagnetic tomography (LORETA). ![]()
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