关键词: 电阻抗成像;有限元模型;电极;优化设计

    摘 要:目的 研究医学电阻抗成像(EIT)系统电极结构对敏感场分布的影响. 方法 设计一个具有边界强制等势点的有限元模型，通过仿真，分析了复合电极宽度对敏感场分布的影响，并进一步对不同激励模式，敏感电极的结构尺寸进行了定量的优化设计. 结果 当电极覆盖比率为57.1%时，效果最优. 结论 进行电极优化设计时，其场分布的均匀性、敏度与电极覆盖率应综合考虑.

    Optimum design of the structure of electrode for clinical EIT system

    WANG Chao，WANG Hua-Xiang

    School of Automation，Tianjin University，Tianjin300072，China

    Keywords:electrical impedance tomography;finite element model;electrode;optimum design

    Abstract:AIM To study the distribution of sensing field af-fected by the structure of electrodes.METHODS A finite element model was designed with the condition of coercive e-quipotential nodes on boundary.RESULTS Distribution of sensitive field affected by the width of compound electrodes was described via simulation，and the optimum design of structure size of the electrode for different strategy was intro┐duced.CONCLUSION When electrode covering ratio is57.1% ......