心脏磁场强度检测信号的频域空间滤波法  

The Spatial Filtering Method of Detected Cardiac Magnetic Signal

作　　者：陈波[1] 蒋式勤[1] 张磊[1] 李安力[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201804

出　　处：《现代科学仪器》2007年第1期37-40,共4页Modern Scientific Instruments

基　　金：上海市科学发展基金资助(项目编号:054407061)。

摘　　要：目前,与人体无接触的多通道高温超导量子干涉器能够记录人体心脏表面的磁场强度,在发达国家,相关技术已经被用于临床诊断心肌缺血等疾病[1]。本文利用心脏磁场单磁偶极子模型研究了心脏磁场强度检测信号的频域空间滤波法。由于心脏磁场呈空间分布,对心脏表面多通道检测信号整体滤波可以参考相关信息。我们用心脏磁场模型的数据分别加5%,10%和20%的高斯白噪声来模拟受环境噪声影响的检测数据。基于二维频域变换的思想,对心磁信号按行和列进行了空间滤波,并通过数字仿真,计算和比较了滤波前后心磁信号的信噪比(SNR)与拟和优度(GOF),从而验证了这种信号预处理方法的有效性。At present, multi-channels SQUID records the cardiac magnetic data detected on the surface of human hearts, Correlative technology has been used to diagnose disease in developed countries, Based on single magnetic dipole model, the spatial filtering method of cardiac magnetic signal in the frequency domain was investigated, Owing to cardiac magnetic distribution in the space, the overall filtering of detected Multi-channels signals is able to use correlative information references, We added 5%, 10% and 20% Gauss White Noise, which were used to simulate environment noise, to the computing data of cardiac magnetic field model, Based on the theory of two-dimensional transform in frequency domain, the spatial filtering method was applied to cardiac magnetic signals by row and column, Through digital simulation, we calculated the GOF and SNR before filtering and after filtering respectively, then compared them, The results testified the validity of this signal pretreatment method.

关 键 词：空间滤波 磁场模型 快速傅立叶变换 等磁场图 

分 类 号：TH789[机械工程—仪器科学与技术]