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

Yagyu, Kazuyori; Takeuchi, Fumiya; Shiraishi, Hideaki; Nakane, Shingo; Sueda, Keitaro; Asahina, Naoko; Kohsaka, Shinobu; Umeoka, Shuichi; Usui, Naotaka; Baba, Koichi; Saitoh, Shinji

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

Yagyu, Kazuyori; Takeuchi, Fumiya; Shiraishi, Hideaki et al.

Epilepsy Research, 2010, 90(3), 199-206

Permalink : https://hdl.handle.net/2115/43835

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アクセス権	open access
URI	https://hdl.handle.net/2115/43835
タイトル	The applications of time-frequency analyses to ictal magnetoencephalography in neocortical epilepsy
著者	Yagyu, Kazuyori ; Takeuchi, Fumiya ; Shiraishi, Hideaki ; Nakane, Shingo ; Sueda, Keitaro ; Asahina, Naoko ; Kohsaka, Shinobu ; Umeoka, Shuichi ; Usui, Naotaka ; Baba, Koichi ; Saitoh, Shinji
著者名 Yagyu, Kazuyori
著者名 Takeuchi, Fumiya
著者名 Shiraishi, Hideaki
著者名 Nakane, Shingo
著者名 Sueda, Keitaro
著者名 Asahina, Naoko
著者名 Kohsaka, Shinobu
著者名 Umeoka, Shuichi
著者名 Usui, Naotaka
著者名 Baba, Koichi
著者名 Saitoh, Shinji
言語	英語
キーワード	Ictal onset
	Propagation
	Polyspike
	Short-time Fourier transform
	Ictal discharge
	Rhythmic activities
発行日	2010-08
出版者	Elsevier B.V.
収録物名	Epilepsy Research
巻(号)	90(3)
ページ	199-206
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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0920-1211
関連情報	PMID 20605700
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.eplepsyres.2010.05.001