Model of Inhomogeneous Volume Conductors for a Magnetic Nerve Stimulation Mechanism

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  • Kobayashi M.
    Institute of Medical Electronics, Faculty of Medicine, University of Tokyo
  • Ueno S.
    Institute of Medical Electronics, Faculty of Medicine, University of Tokyo
  • Kurokawa T.
    Department of Orthopedic Surgery, Faculty of Medicine, University of Tokyo

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Other Title
  • 神経磁気刺激の機序解明のための不均一容積導体モデル
  • シンケイ ジキ シゲキ ノ キジョ カイメイ ノ タメ ノ フキンイツ ヨウセ
  • 神経磁気刺激の機序解明のための不均一容積導体モデル (<特集>生体磁気・磁場効果)

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Abstract

We measured the electric fields induced by figure-of-eight coils in homogeneous and inhomogeneous volume conductor models. Each model consisted of two troughs separated by a sheet of cellophane. In the inhomogeneous model, one of the two troughs was filled with 0.9% saline solution, and the other with 0.1% saline solution. In the homogeneous model, both troughs were filled with 0.9% saline solution. The figure-of-eight coil was held beneath the troughs with its wings parallel to a boundary between the two troughs. In the inhomogeneous model, the electric field along the boundary and especially its first spatial derivative were markedly elevated in comparison with the corresponding values recorded in the homogeneous model. The response of a nerve fiber to magnetic stimulation in an inhomogeneous medium is different from that in a homogeneous medium.

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