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The applications of time-frequency analyses to ictal magnetoencephalography in neocortical epilepsy

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タイトル: The applications of time-frequency analyses to ictal magnetoencephalography in neocortical epilepsy
著者: Yagyu, Kazuyori 著作を一覧する
Takeuchi, Fumiya 著作を一覧する
Shiraishi, Hideaki 著作を一覧する
Nakane, Shingo 著作を一覧する
Sueda, Keitaro 著作を一覧する
Asahina, Naoko 著作を一覧する
Kohsaka, Shinobu 著作を一覧する
Umeoka, Shuichi 著作を一覧する
Usui, Naotaka 著作を一覧する
Baba, Koichi 著作を一覧する
Saitoh, Shinji 著作を一覧する
キーワード: Ictal onset
Propagation
Polyspike
Short-time Fourier transform
Ictal discharge
Rhythmic activities
発行日: 2010年 8月
出版者: Elsevier B.V.
誌名: Epilepsy Research
巻: 90
号: 3
開始ページ: 199
終了ページ: 206
出版社 DOI: 10.1016/j.eplepsyres.2010.05.001
抄録: Purpose: Ictal magenetoencephalographic (MEG) discharges convey significant information about ictal onset and propagation, but there is no established method for analyzing ictal MEG. This study sought to clarify the usefulness of time-frequency analyses using short-time Fourier transform (STFT) for ictal onset and propagation of ictal MEG activity in patients with neocortical epilepsy. Methods: Four ictal MEG discharges in two patients with perirolandic epilepsy and one with frontal lobe epilepsy (FLE) were evaluated by time-frequency analyses using STFT. Prominent oscillation bands were collected manually and the magnitudes of those specific bands were superimposed on individual 3D-magnetic resonance images. Results: STFT showed specific rhythmic activities from alpha to beta bands at the magnetological onset in all four ictal MEG records. Those activities were located at the vicinity of interictal spike sources, as estimated by the single dipole method (SDM), and two of the four ictal rhythmic activities promptly propagated to ipsilateral or bilateral cerebral cortices. The patients with FLE and perirolandic epilepsy underwent frontal lobectomy and resection of primary motor area, respectively including the origin of high-magnitude areas of a specific band indicated by STFT, and have been seizure free after the surgery. Conclusions: STFT for ictal MEG discharges readily demonstrated the ictal onset and propagation. These data were important for decisions on surgical procedure and extent of resection. Ictal MEG analyses using STFT could provide a powerful tool for noninvasive evaluation of ictal onset zone.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/43835
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 柳生 一自

 

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