Analysis of 3-D Somatosensory Evoked Field with Dynamic Singular Value Decomposition

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概要

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• We carried out a three-dimensional vector measurement of a somatosensory evoked field (SEF) with an electric stimulus to the right thumb, using three-dimensional second-order gradiometers connected to 39-channel SQUIDs, which can detect magnetic components perpendicular to the scalp (Br) and tangential to the scalp (Bθ, Bφ) simultaneously. A dynamic singular value decomposition method, with a time window and shift time, was applied to spatio-temporal magnetic data. First, averaging of the SEF data with a dynamic SVD was done with each trigger for stimulation. Second, dynamic SVD was applied to SEF data, having two frequencies ranges (1-80Hz and 15-80Hz), and with a time window of 10ms and which was shifted every 1ms in analysis. Two dominant singular values were obtained for the contralateral magnetic component in 90 to 110ms. Source localization of SI and SII activity with a ECD method showed dominant GOF (goodness of fitness) around 90ms. We concluded that the proposed dynamic SVD method, with a time window and shift time, is useful for reducing noise component in SEF data and discriminating multiple sources overlapping in time.

• 社団法人日本磁気学会の論文
• 2005-08-01

著者

• Kim B.s.

  School Of Science And Engineering Tokyo Denki Univ

• Kim B.s.

  School Of Science And Engineering Tokyo Denki Univ.

• UCHIKAWA Y.

  Graduate School of Advanced Science and Technology, Tokyo Denki University

• Uchikawa Y.

  School of Science and Engineering, Tokyo Denki Univ.

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• Analysis of 3-D Somatosensory Evoked Field with Dynamic Singular Value Decomposition

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