生体医工学
Online ISSN : 1881-4379
Print ISSN : 1347-443X
研究
経頭蓋磁気刺激用の偏心8字コイルの回路定数と脳内渦電流分布の数値解析
加藤 拓哉関野 正樹松崎 大河西川 敦齋藤 洋一大崎 博之
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2012 年 50 巻 1 号 p. 180-188

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We previously proposed an eccentric figure-eight coil design which induces sufficient currents in the brain at lower output powers of stimulator. In the present study, numerical analyses were performed with various coil design parameters, such as outer and inner diameters and number of turns, to investigate the influence of these parameters on the eddy current distribution in the brain and the coil characteristics. Increases in the inner diameter, the outer diameter, and the number of turns caused increases in the induced currents. In order to downsize the stimulator system, we need to strengthen the eddy current in the brain, maintaining inductance as small as possible. Our results show that it is effective to enlarge outer diameter. In addition, there is only small difference in the eddy current distributions between the eccentric coil and the concentric coil in direction along with the coil plane and with depth of the brain.

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© 2012 社団法人日本生体医工学会
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