摘要
目的:为实现用于脑磁感应成像系统中的数字鉴相方法,寻求一种高精度的相位检测手段.方法:本研究采用LabView对数据采集卡编程,控制激励信号的产生和检测信号的采集;采用Matlab进行快速傅立叶变换法(FFT)法,相关法和经典法的编程,用于实现数字鉴相.结果:得到了步进0.1°条件下的数字鉴相结果,构建了一整套包含信号产生、采集和处理的鉴相系统,最终,实现了FFT法和相关法0.1°的相位差分辨率.结论:数字鉴相方法能够应用于脑磁感应断层成像技术(MIT)检测系统中,对高精度的系统测量提供了理论依据.
AIM： To realize digital phase detection methods in brain magnetic induction tomography （MIT） system and to find a phase detection method with high accuracy. METHODS： The data acquisition board was programmed with LabView to control the generation of excitation signal and the sampling of detection signal. The fast fourier transform （FFT） method, correlation method and classic method were programmed with Maflab to realize digital phase detection. RFSULTS： The phase detection results with 0.1 o step were obtained and a phase detection system including signal generation, collection and processing was obtained as well. Finally, the FFT method and correlation method reached the phase shift resolution of 0. 1^o. CONCLUSION： Digital phase detection method can be successfully used in the phase shift detection in MIT detection system and provide a theoretical foundation for system measurement.
出处
《第四军医大学学报》
北大核心
2007年第12期1144-1146,共3页
Journal of the Fourth Military Medical University
基金
全军"十一五"课题资助项目(06MA224)
关键词
脑磁感应成像
相位检测
导电性
傅里叶分析
相关法
brain magnetic induction tomography
phase detection
electric conductivity
fourier analysis
correlation method
