Evaluation of high frequency oscillations by gradient magnetic-oscillation topography in epilepsy
Background: To analyze High frequency oscillations (HFO) of magnetoencephalography, we have developed gradient magnetic-oscillation topography (GMOT), which projects every sensor vertically onto the brain surface and displays the power for each frequency on the brain surface. Methods: The subjects w...
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| Published in | Transactions of Japanese Society for Medical and Biological Engineering Vol. Annual59; no. Proc; pp. 672 - 674 |
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| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | Japanese |
| Published |
Japanese Society for Medical and Biological Engineering
2021
公益社団法人 日本生体医工学会 |
| Online Access | Get full text |
| ISSN | 1347-443X 1881-4379 |
| DOI | 10.11239/jsmbe.Annual59.672 |
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| Abstract | Background: To analyze High frequency oscillations (HFO) of magnetoencephalography, we have developed gradient magnetic-oscillation topography (GMOT), which projects every sensor vertically onto the brain surface and displays the power for each frequency on the brain surface. Methods: The subjects were 11 patients with intractable epilepsy who underwent focal resection. There were 7 males and 4 females (mean 23.0 years). Postoperative pathological findings were Glioma in 7, Cavernous hemangioma in 2, Hippocampal sclerosis in 1, and Focal cortical dysplasia type II in 1. GMOTs were created to visualize the power of 200-330 Hz. Fast ripples (FR) are defined as power of 800 (fT/m)^2/Hz or higher. The 3-35 Hz waveform was also analyzed by ECD.Results: ECDs clustered near the lesion in 8/11. GMOT visualized FR near the lesion in 9/11.Conclusion: The results of HFO analysis by GMOT showed almost the same as the ECD method. |
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| AbstractList | Background: To analyze High frequency oscillations (HFO) of magnetoencephalography, we have developed gradient magnetic-oscillation topography (GMOT), which projects every sensor vertically onto the brain surface and displays the power for each frequency on the brain surface. Methods: The subjects were 11 patients with intractable epilepsy who underwent focal resection. There were 7 males and 4 females (mean 23.0 years). Postoperative pathological findings were Glioma in 7, Cavernous hemangioma in 2, Hippocampal sclerosis in 1, and Focal cortical dysplasia type II in 1. GMOTs were created to visualize the power of 200-330 Hz. Fast ripples (FR) are defined as power of 800 (fT/m)^2/Hz or higher. The 3-35 Hz waveform was also analyzed by ECD.Results: ECDs clustered near the lesion in 8/11. GMOT visualized FR near the lesion in 9/11.Conclusion: The results of HFO analysis by GMOT showed almost the same as the ECD method. Background: To analyze High frequency oscillations (HFO) of magnetoencephalography, we have developed gradient magnetic-oscillation topography (GMOT), which projects every sensor vertically onto the brain surface and displays the power for each frequency on the brain surface. Methods: The subjects were 11 patients with intractable epilepsy who underwent focal resection. There were 7 males and 4 females (mean 23.0 years). Postoperative pathological findings were Glioma in 7, Cavernous hemangioma in 2, Hippocampal sclerosis in 1, and Focal cortical dysplasia type II in 1. GMOTs were created to visualize the power of 200-330 Hz. Fast ripples (FR) are defined as power of 800 (fT/m)^2/Hz or higher. The 3-35 Hz waveform was also analyzed by ECD.Results: ECDs clustered near the lesion in 8/11. GMOT visualized FR near the lesion in 9/11.Conclusion: The results of HFO analysis by GMOT showed almost the same as the ECD method. 【【背景】High frequency oscillations (HFO)はてんかん原性ネットワークの潜在的指標と考えられている。脳磁図の周波数解析の方法として、センサーを垂直方向に脳表へ射影して脳表上に周波数ごとにパワーを表示する、傾斜磁振動トポグラフィー(gradient magnetic-oscillation topography: GMOT)を開発した。【方法】2018年1月から2020年5月までに広島大学脳神経外科において焦点切除術を施行された病変を有する難治てんかん11例を対象とした。男性7名、女性4名で、平均年齢23.0歳（2－47歳）であった。術後病理所見は、Glioma 7例、Cavernous hemangioma 2例、Hippocampal sclerosis 1例、Focal cortical dysplasia type II 1例であった。頭蓋内電極設置は２例で施行されていた。術後発作転帰はEngel class I 10例、Engel class II 1例であった。脳磁図解析では、全検査時間について１秒おきに、HFOのうち200-330 Hzのパワーを脳表に描出するGMOTを作成した。パワーが800 (fT/cm)^2/Hz 以上をfast ripples (FR)と定義した。3-35Hzの波形についてECD推定により解析し、GMOTの結果と比較した。【結果】ECDは8/11例（72.7%）で病変近傍に集簇した。GMOTはFRを9/11例（81.8%）で病変近傍の脳表に描出した。頭蓋内脳波を施行した2例では、ictal onset zoneとGMOTで得られたFR領域との距離は3cm以内であった。【結論】GMOTによるHFOの解析結果はECD推定法とほぼ同様の結果を示した。 |
| Author | Hashizume, Akira Iida, Koji Katagiri, Masaya Kurisu, Kaoru Okamura, Akitake Kagawa, Kota Seyama, Go |
| Author_FL | 栗栖 薫 Kagawa Kota 瀬山 剛 Okamura Akitake Iida Koji Hashizume Akira 片桐 匡弥 |
| Author_FL_xml | – sequence: 1 fullname: Okamura Akitake – sequence: 2 fullname: Hashizume Akira – sequence: 3 fullname: Kagawa Kota – sequence: 4 fullname: 片桐 匡弥 – sequence: 5 fullname: 瀬山 剛 – sequence: 6 fullname: 栗栖 薫 – sequence: 7 fullname: Iida Koji |
| Author_xml | – sequence: 1 fullname: Kurisu, Kaoru organization: Department of Neurosurgery, Chugoku Rosai Hospital, Hiroshima, Japan – sequence: 1 fullname: Kagawa, Kota organization: Epilepsy Center, Hiroshima University Hospital, Hiroshima, Japan – sequence: 1 fullname: Okamura, Akitake organization: Department of Neurosurgery, Takanobashi Central Hospital, Hiroshima, Japan – sequence: 1 fullname: Hashizume, Akira organization: Department of Neurosurgery, Otagawa Hospital, Hiroshima, Japan – sequence: 1 fullname: Katagiri, Masaya organization: Epilepsy Center, Hiroshima University Hospital, Hiroshima, Japan – sequence: 1 fullname: Iida, Koji organization: Epilepsy Center, Hiroshima University Hospital, Hiroshima, Japan – sequence: 1 fullname: Seyama, Go organization: Epilepsy Center, Hiroshima University Hospital, Hiroshima, Japan |
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| Snippet | Background: To analyze High frequency oscillations (HFO) of magnetoencephalography, we have developed gradient magnetic-oscillation topography (GMOT), which... |
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| Title | Evaluation of high frequency oscillations by gradient magnetic-oscillation topography in epilepsy |
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