MIT单通道测量的电磁关系及脑组织电导率测量参数计算  

Electromagnetic relation of single measurement channel of MIT and computing of electromagnetic parameters in measurement of brain conductivity

作　　者：秦明新[1] 焦李成[1] 李世俊[2] 王聪[2] 吕华[2] 董秀珍[2] 

机构地区：[1]西安电子科技大学电子工程学院智能信息处理研究所,陕西西安710071 [2]第四军医大学生物医学工程系医电工程教研室,陕西西安710033

出　　处：《第四军医大学学报》2004年第21期2007-2010,共4页Journal of the Fourth Military Medical University

基　　金：全军医药卫生科研基金重点课题 (0 1Z0 78)

摘　　要：目的 :基于已完成的单通道测量MIT实验系统 ,根据理想物理模型 ,推导实验系统的电磁关系 ,为系统的优化设计和改进提供理论依据 .方法 :采用电磁感应理论、理想物理模型 ,得到特定频率下目标电导率与系统测量参数的关系 .结果 :获得了目标电导率与系统测量线圈电流相位和幅值变化的关系 ,并计算了目标电导率为头皮、颅骨、脑脊液、脑灰质、脑白质、脑水肿时的相位和幅值变化 .结论 :为了提高单通道测量MIT实验系统性能 ,应适当增加激励频率 ;精确提取参考线圈电流与测量线圈电流的相位差 ;选用高性能的鉴相器件 .AIM: To further optimize and improve upon our MIT experiment system and explore specific electromagnetic relations of our experiment system. METHODS: Based on electromagnetic induction theory and ideal physical model of our single measurement channel of MIT, we deduced electromagnetic relations of the system. RESULTS: Current phase and magnitude in the receiving coil were related to the conductivity of objects. The phase shifts and magnitude changes of the receiving coil current were calculated when the object conductivity was set for five sorts of normal brain tissues and brain edema. CONCLUSION: To improve the performance of MIT measurement system, we should use higher exciting frequency, accurately acquire phase shift between reference and receiving coils and choose phase sensitive detector of high performance.

关 键 词：脑组织 非接触测量 磁感应断层成像 电导率 

分 类 号：R318.3[医药卫生—生物医学工程]