自适应时间窗心磁源重构的方法研究  

Research on Adaptive Time Window Magnetocardiography Source Reconstruction Method

作　　者：潘宝君 朱俊杰[1] PAN Bao-jun;ZHU Jun-jie(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工大学电气工程与自动化学院

出　　处：《软件》2019年第11期43-48,共6页Software

基　　金：国家自然科学基金（61601173)

摘　　要：在使用线性约束最小方差(LCMV)波束形成器重构心脏磁场电流源的研究中,为了解决时间窗过大或者太小造成心脏电流源遗漏的问题,文中提出一种自适应时间窗波束形成的心磁源重构方法。该方法通过不断的调整时间窗得到相应的功率谱,然后求出功率谱中所有的局部极大值,当局部极大值中的最大值和最小值的比值达到最小时,此时对应的时间窗为源重构的最佳时间窗。在仿真实验中,用固定时间窗和自适应时间窗波束形成方法分别对两个和三个电流偶极子产生的心磁数据进行了重构,结果表明,自适应时间窗波束形成方法在两种情况下都具有较好的源重构能力。In the study of reconstructing the cardiac magnetic field current source using the linear constrained minimum variance(LCMV)beamformer,in order to solve the problem that the current source is missing due to too large or too small time window,an adaptive time window beamforming is proposed.Cardiac magnetic source reconstruction method.The method obtains the corresponding power spectrum by continuously adjusting the time window,and then finds all local maximum values in the power spectrum.When the ratio of the maximum value and the minimum value in the local maximum value reaches a minimum,the corresponding time at this time The window is the best time window for source reconstruction.In the simulation experiment,the cardiac magnetic data generated by two and three current dipoles are reconstructed by fixed time window and adaptive time window beamforming method respectively.The results show that the adaptive time window beamforming method is in two.In all cases,there is better source reconstruction capability.

关 键 词：心磁源重构 波束形成 线性约束最小方差 逆问题 心磁源成像 

分 类 号：TN911.73[电子电信—通信与信息系统]