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頁籤選單縮合
題 名 | Application of Dipole Modeling in Localization of Mesio-Temporal Epileptogenic Focus=應用電偶極模型定位近中顳葉癲癇焦點 |
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作 者 | 陳家進; 蔡景仁; 許慶煌; 林欣穎; 葉秩光; | 書刊名 | Proceedings of the National Science Council : Part B, Life Science |
卷 期 | 21:2 1997.04[民86.04] |
頁 次 | 頁61-70 |
分類號 | 410.01344、410.01344 |
關鍵詞 | 癲癇; Dipole modeling; EEG; Epilepsy; Singular value decomposition; |
語 文 | 英文(English) |
中文摘要 | 本研究主要在於發展一改良電偶極模型非侵入定位方法來定位癲癇焦點;在頭顱 模型方面,本研究利用三度空間定位儀量測出貼附在頭顱表面電極的正確位置。應用李文伯 格-馬奎德非線性最佳化演算法於電偶極的定位上,另外,為了使最佳化演算法收斂到正確 位置,則利用奇異值分解法擷取腦波中的主要棘波成份,並且以三度空間拓蹼映射求取最佳 化定位的初始位置。 本研究比較不同的電極組態,包含標準 10-20 電極、顳葉加強電極、 侵入式蝶骨插針電極等的定位結果。最後實驗結果證明,利用顳葉加強電極可提供與侵入式 蝶骨插針電極相同的定位效果,並且可以區分來自近中顳葉或顳葉的癲癇焦點。 |
英文摘要 | Improved methods for noninvasive localization of an epileptic focus, modeled as an electrical dipole, are developed in this research. For the head geometrical model, a three-dimensional (3-D) electromagnetic tracking system is utilized to measure the exact positions of electrodes. A nonlinear optimization technique, the Levenberg-Marquardt method, is adopted for dipole localization. For the optimization algorithm to convege to correct solution, the singular value decomposition (SVD) technique is used to extract the dominant component of the EEG spike for initial estimation and dipole localization. The localization results of varied montages, including standard 10-20 electrodes and enhanced temporal electrodes, with or without invasive sphenoid electrodes, are compared. Our experimental results indicate that dipole localization with enhanced temporal electrodes can be used as an alternative for the invasive sphenoid electrodes to differentiate the epileptogenic foci of mesio-temporal area from temporal convexity. |
本系統中英文摘要資訊取自各篇刊載內容。