三次元ベクトル計測による特異値分解を用いたα波脳磁界の解析 : 生体磁気

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This paper describes a method of source estimation for a magnetic alpha wave, using a combination of singular value decomposition (SVD) analysis and measurement of the tangential magnetic field component in a 3-D vector magnetoencephalogram (MEG). First, we found, as a result of singular value decomposition analysis, that two dominant singular values exist in not only the perpendicular component but also the tangential components (B_θ B_φ). To discuss the source structure of the right and the left hemisphere in the brain, we calculated the singular value with the data obtained from each the right and the left head. Two singular values with score proportion (>80 %) were also obtained to both of the right and the left. The second, using the isofield contour map of tangential component of magnetic alpha wave, it was found that there are two extreme values. These results indicated that there were two sources in the magnetic alpha wave. Further, we could confirm that SVD analysis and measuring tangential component were useful to separate sources of magnetic alpha wave overlapping in time.
社団法人日本磁気学会の論文
2002-04-01