感应电流EIT中激励线圈的设计  

Design of coils in induced current electrical impedance tomography

作　　者：向海燕[1] 董秀珍[1] 秦明新[1] 尤富生[1] 史学涛[1] 付峰[1] 刘锐岗[1] 马建英[1] 

机构地区：[1]第四军医大学生物医学工程系医学电子工程教研室,陕西西安710033

出　　处：《第四军医大学学报》2002年第6期568-571,共4页Journal of the Fourth Military Medical University

基　　金：中国 -以色列科学与战略研究开发专项资金合作研究项目( 99M-0 0 2 14 2 6 )

摘　　要：目的　研究在感应电流电阻抗断层成像 (inducedcurrent electrical im pedance 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 。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. Circular coil's configuration was studied on the basis of the condition number of the sensitive matrix. For the axis coil, the currents in the object and the potential of the boundary were calculated. Furthermore, the factors confining the distinguishability were discussed. RESULTS The appropriate size and configuration of cirlular coils was found and axis coil was able to enhance the currents in the center of the object. CONCLUSION Circular coil of appropriate configuration is able to obtain lesser condition number and axis coil is able to enhance the sensitivity of the center and the radius distinguishability.

关 键 词：感应电流 电阻抗 体层摄影术 激励线圈 设计 圆形线圈 有轴线圈 

分 类 号：TH774[机械工程—仪器科学与技术] R812[机械工程—精密仪器及机械]