A Novel Method for Extracting Interictal Epileptiform Discharges in Multi-channel MEG and Developing Support Analysis Tool

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  • Matsubara Teppei
    Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University
  • Hironaga Naruhito
    Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University
  • Uehara Taira
    Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University
  • Chatani Hiroshi
    Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University
  • Tobimatsu Shozo
    Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University
  • Kishida Kuniharu
    Professor Emeritus of Gifu University

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  • 新しい信号源分離解析による発作間欠期てんかん性放電の抽出と解析支援ツールの開発

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<p>Visual inspection of interictal epileptiform discharges (IEDs) in multi-channel magnetoencephalography (MEG) requires a time-consuming evaluation process and often leads to inconsistent results among interpreters. In most clinical situations, the application of independent component analysis is restricted to artifact rejection. Here, we propose a novel extraction method for IEDs using a T/k type of blind source separation (BSST/k). We conducted comparisons of the results of BSS components with those obtained by visual inspection in sensor-space analysis for seven patients with focal epilepsy. BSST/k provided better signal decomposition of variable IEDs in one dominant component compared with sensor-space analysis. The dominant component was able to uncover IEDs that could not be detected by visual inspection, showing sufficient sensitivity along with high specificity. BSST/k was able to visualize the spreading signals over multiple channels into a single component from a single epileptogenic zone. BSST/k can be applied to focal epilepsy with a simple parameter setting. Based on the above results, we plan to develop the support analysis tool for visual identification of IEDs in future.</p>

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