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Magnetoencephalographic Localization of Epileptic foci using a 37-Channel Biomagnetometer Motohide Ogashiwa 1 , Hiroshi Takahashi 2 , Hirotake Nakano 1 , Yuu Kaneko 3 , Kintomo Takakura 3 1Department of Neurosurgery, National Center of Neurology and Psychiatry 2Department of Neurosurgery, Tokyo Metro-politan Neurological Hospital 3Department of Neurosurgery, Faculty of Medicine, University of Tokyo Keyword: magnetoencephalography , focal epnepsy , interictal spike , dipole fitting , electroence-phalography pp.1067-1074
Published Date 1991/11/1
DOI https://doi.org/10.11477/mf.1406900274
  • Abstract
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The magnetoencephalography (MEG) and elec-troencephalography (EEG) were recorded simulta-neously from 10 normal subjects using a 37-channel biomagnetometer. No paroxysmal spikelike waveform was observed in MEG at rest with eyes closed. The MEG and EEG were recorded also from 16 patients with primary epilepsy and 24 patients with secondary epilepsy. The examination proved to be safe for both normal subjects and patients with epilepsy. Interictal spikes were observed in 27 cases during the examination. The percentage of spikes identified in MEG but not in EEG was found to be 2. 3% of all spikes. The foci of the spikes identified in MEG were localized and determined in 20 cases. In 10 patients with secondary epilepsy, the localization of the foci were compared with the lesion demon-strated by magnetic resonance imaging (MRI) or computerized tomography (CT) and with the findings of EEG. In 6 cases, the foci by MEG were consistent. In the 4 cases where the MEG foci did not correspond to the MRI or CT findings, MEG foci were supported by the findings of EEG. MEG allows three-dimensional localization and enables us to elucidate the propagation of paroxysms. MEG was very useful in diagnosing epilepsy.


Copyright © 1991, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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