Measurement of T wave in magnetocardiography using tunnel magnetoresistance sensor  

作　　者：陆知宏 纪帅 杨建中 Zhihong Lu;Shuai Ji;Jianzhong Yang(Department of Precision Instrument,Tsinghua University,Beijing 100084,China;Beijing Innovation Center for Future Chips,Beijing 100084,China;State Key Laboratory of Precision Measurement Technology and Instruments,Tsinghua University,Beijing 100084,China)

机构地区：[1]Department of Precision Instrument,Tsinghua University,Beijing 100084,China [2]Beijing Innovation Center for Future Chips,Beijing 100084,China [3]State Key Laboratory of Precision Measurement Technology and Instruments,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Physics B》2023年第2期5-10,共6页中国物理B（英文版）

基　　金：supported by the Suzhou Tsinghua innovation leading action project(Grant No.2016SZ0217);the National Key Research and Development Program of China(Grant No.2016YFB0500902)。

摘　　要：Several critical clinical applications of magnetocardiography(MCG)involve its T wave.The T wave’s accuracy directly affects the diagnostic accuracy of MCG for ischemic heart disease and arrhythmogenic.Tunnel magnetoresistance(TMR)attracts attention as a new MCG measurement technique.However,the T waves measured by TMR are often drowned in noise.The accuracy of T waves needs to be discussed to determine the clinical value of MCG measured by TMR.This study uses an improved empirical mode decomposition(EMD)algorithm and averaging to eliminate the noise in the MCG measured by TMR.The MCG signals measured by TMR are compared with MCG measured by the optically pumped magnetometer(OPM)to judge its accuracy.Using the MCG measured by OPM as a reference,the relative errors in time and amplitude of the T wave measured by TMR are 3.4%and 1.8%,respectively.This is the first demonstration that TMR can accurately measure the time and amplitude of MCG T waves.The ability to provide reliable T wave data illustrates the significant clinical application value of TMR in MCG measurement.

关 键 词：MAGNETOCARDIOGRAPHY tunnel magnetoresistance optically pumped magnetometer T wave detection 

分 类 号：TN911.7[电子电信—通信与信息系统] TP212[电子电信—信息与通信工程] R318.6[自动化与计算机技术—检测技术与自动化装置]