用于颅内压监护的多频阻抗同步测试系统  

Multi-frequency impedances simultaneously measuring system for monitoring of intracranial pressure

作　　者：苏密勇[1] 谭永红[2] 王子民[3] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071 [2]上海师范大学信息与机电工程学院,上海201418 [3]桂林电子科技大学电子工程与自动化学院,桂林541004

出　　处：《电子测量与仪器学报》2014年第6期637-643,共7页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(60971004)资助项目

摘　　要：设计了一种新的脑颅双侧多频阻抗同步测试系统,用于测试由于颅内压变化所引起的阻抗的变化.根据时域阻抗法原理,以及脑颅两侧多频阻抗同步测试的需要,搭建了能够实现任意电流波形发生以及3个通道信号（1个通道是发生的电流信号,另外2个通道是响应的电压信号）并行采集的功能的时域信号测试硬件平台.给出了1种基于特殊奇次多正弦信号作为输入的多频阻抗的无偏计算方法.初步实验结果表明,系统可以实现脑颅双侧1.8～ 71 kHz多频阻抗同步高精度测试.从而验证本系统的有效性.To measure the changes of brain impedances due to the changes of ICP （intracranial pressure）,an impedances measurement system is designed,which is used for accurately and simultaneously measuring multi-frequency Impedances （MFI） of bilateral sides of brain.According to the theory of time-based impedance measurement and the requirement of simultaneously measurement of MFI of bilateral sides of brain,a time-domain signal testing platform with arbitrary current waveform generation and three channels （one exciting current and two response voltages） simultaneously sampling is constructed.The measurement system also includes a set of MFI simultaneously unbiased computing algorithm based on special odd multi-sine current signal input.Preliminary validating experiments suggest that the system allows accurate and simultaneous measurement of MFI of bilateral sides of brain at least in the frequency range of 1.8 kHz to ～ 71 kHz.And the effectiveness of the system is verified.

关 键 词：颅内压 监护 多频阻抗 同步测试 

分 类 号：TN72[电子电信—电路与系统] R318[医药卫生—生物医学工程]