多信道脑部磁刺激仪的磁场有限元仿真  

FINITE-ELEMENT SIMULATION FOR MAGNETIC FIELDS CREATED BY MULTI-CHANNEL BRAIN MAGNETIC STIMULATOR

作　　者：王学民[1] 陈韵[1] 郭明霞[2] 王明时[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院生物医学工程系,天津300072 [2]天津医科大学医学影像系,天津300203

出　　处：《生物物理学报》2005年第5期377-384,共8页Acta Biophysica Sinica

基　　金：国家自然科学基金项目(30350003);天津市教育委员会科技发展基金项目(20030219)

摘　　要：利用外部的交变磁场,可以对大脑神经系统进行无创刺激。用有限元分析软件——ANSYS对多信道脑部磁刺激仪在不同工作模式下产生的磁场进行了模拟,并将其与实验测量值进行了比较。结果表明,两者之间的误差小于6%,ANSYS能有效模拟多信道磁刺激仪所产生的磁场。通过对仿真结果进行分析得出:改变多信道磁刺激仪工作线圈的位置,可以调整所产生磁场的位置及形状;增加刺激靶位置邻近的工作线圈个数,可以有效改善磁刺激的深度。The brain can be stimulated non-invasively with externally time-varying magnetic fields. The magnetic fields created by a multi-channel magnetic stimulator are simulated using finite-element analysis soflware-ANSYS, and the results of simulation are compared with that of experiments. The comparison showed that the error rate between simulation and experiment was less than 6%. By analyzing the results of the simulation, the conclusion was reached： the shape of magnetic fields could be adjusted by changing the operating mode of the stimulator. The depth of the magnetic stimulation could be improved evidently while increasing the stimulating number of the coil.

关 键 词：有限元分析 磁场 多信道磁刺激 

分 类 号：Q64[生物学—生物物理学]