中国物理B ›› 2023, Vol. 32 ›› Issue (2): 20703-020703.doi: 10.1088/1674-1056/aca5fe

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Measurement of T wave in magnetocardiography using tunnel magnetoresistance sensor

Zhihong Lu(陆知宏)1,2,3, Shuai Ji(纪帅)1,2,3, and Jianzhong Yang(杨建中)1,2,3,†   

  1. 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
  • 收稿日期:2022-06-01 修回日期:2022-10-22 接受日期:2022-11-25 出版日期:2023-01-10 发布日期:2023-01-10
  • 通讯作者: Jianzhong Yang E-mail:yang-jz@tsinghua.edu.cn
  • 基金资助:
    Project supported by the Suzhou Tsinghua innovation leading action project (Grant No. 2016SZ0217) and the National Key Research and Development Program of China (Grant No. 2016YFB0500902).

Measurement of T wave in magnetocardiography using tunnel magnetoresistance sensor

Zhihong Lu(陆知宏)1,2,3, Shuai Ji(纪帅)1,2,3, and Jianzhong Yang(杨建中)1,2,3,†   

  1. 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
  • Received:2022-06-01 Revised:2022-10-22 Accepted:2022-11-25 Online:2023-01-10 Published:2023-01-10
  • Contact: Jianzhong Yang E-mail:yang-jz@tsinghua.edu.cn
  • Supported by:
    Project supported by the Suzhou Tsinghua innovation leading action project (Grant No. 2016SZ0217) and 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

Abstract: 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.

Key words: magnetocardiography, tunnel magnetoresistance, optically pumped magnetometer, T wave detection

中图分类号:  (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

  • 07.07.Df
07.55.Ge (Magnetometers for magnetic field measurements)