关键词: 感应电流;电阻抗;体层摄影术;激励线圈

    摘 要:目的 研究在感应电流电阻抗断层成像(induced current electrical impedance tomography，ICEIT)中，线圈的形状、规格和位置对整体性能的影响. 方法 研究了用于I-CEIT系统的两种线圈.以敏感矩阵的条件数为原则，对圆形线圈的配置进行了研究.计算了另一种有轴线圈内感应电流分布及边界电压，探讨了限制分辨能力的因素.结果 找到了选用圆形线圈时对线圈大小和位置的要求，证实了有轴线圈能增大目标中心区域的电流. 结论 用恰当的配置，使用圆形线圈可使敏感矩阵的条件数较小，而用有轴线圈可以提高中心区域的敏感度和径向分辨能力.

    Design of coils in induced current electrical impedance tomography

    XIANG Hai-Yan，DONG Xiu-Zhen，QIN Ming-Xin，YOU Fu-Sheng，SHI Xue-Tao，FU Feng，LIU Rui-Gang，MA Jian-Ying

    Department of Medical Electronic Engineering，Fac-ulty of Biomedical Engineering，Fourth Military Medical University，Xi'an，710033，China

    Keywords:induced current;electrical impedance;tomogra-phy;exciting coil

    Abstract:AIM To research the effect of the shape，size and configuration of the exciting coils on the perform ance of the system in induced current electrical impedance tomography.

    METHODS Two kinds of exciting coils were studied.Circu-lar coil's configuration was studied on the basis of the condi-tion number of the sensitive matrix.For the axis coil ......