北京生物醫(yī)學(xué)工程

用于經(jīng)顱磁刺激鐵芯線圈的仿真研究

Simulation research on iron-core coils for transcranial magnetic stimulation

作者：孫有為康宜華孫燕華朱沁

單位：華中科技大學(xué)數(shù)字制造裝備與技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室(武漢430074)

關(guān)鍵詞：經(jīng)顱磁刺激；鐵芯線圈；有限元分析；聚焦性；刺激強(qiáng)度

分類號(hào)：

出版年·卷·期（頁(yè)碼）：2013·32·4（342-346）

摘要：

目的研究鐵芯線圈感應(yīng)電場(chǎng)的仿真方法，分析鐵芯截面大小對(duì)線圈性能的影響。方法針對(duì)鐵芯線圈結(jié)構(gòu)復(fù)雜及存在非線性介質(zhì)的特點(diǎn)，采用有限元分析軟件Ansoft對(duì)鐵芯線圈模型進(jìn)行瞬態(tài)磁場(chǎng)仿真，求解不同鐵芯大小的線圈模型在空間域的感應(yīng)電流分布，利用靜態(tài)仿真求解電感值。結(jié)果計(jì)算出不同線圈在深度5mm沿坐標(biāo)軸的電場(chǎng)分布曲線，并統(tǒng)計(jì)曲線中旁峰值與最大值之比。對(duì)比仿真結(jié)果發(fā)現(xiàn)隨著鐵芯截面增大，線圈的刺激強(qiáng)度與電感值增加，聚焦性能先增強(qiáng)后減弱。當(dāng)鐵芯截面約為空心區(qū)域面積1/16時(shí)，鐵芯線圈聚焦性最好。結(jié)論本研究對(duì)帶鐵芯磁刺激線圈的設(shè)計(jì)具有參考作用。

Objective To investigate a simulation method for induced electric field of iron-core coils and analyze the influence of iron core with different cross-section size on the coil performance. Methods Due to iron-core coils with complex structure and nonlinear material，transient magnetic field simulation of iron-core coils was conducted by the finite element software Ansoft. The induced current distributions of the coils with different core size were simulated and inductance value was conducted by using static simulation solution. Results The electric field distribution curves of coils in the depth of 5mm along the coordinate axis were calculated，and the ratio of the second peak value and the maximum value in the curve was counted. As the cross-section of the iron core increased，both stimulus intensity and inductance of iron-core coils increased，focusing performance first increased and then decreased. Besides，the coils with iron core whose cross-section is about 1/16 of the hollow area had the best focusing performance. Conclusions This research provided a point of reference for the design of iron-corn coils for transcranial magnetic stimulation.

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