TY - GEN
T1 - Recording the Distribution of Cardiac Magnetic Fields in Unshielded Earth's Field
AU - Sun, Chenxi
AU - Xiao, Wei
AU - Ding, Yudong
AU - Zhang, Rui
AU - Liu, Meng
AU - Wu, Teng
AU - Peng, Xiang
AU - Chen, Jingbiao
AU - Guo, Hong
N1 - Publisher Copyright:
© 2021 IEEE.
PY - 2021
Y1 - 2021
N2 - Magnetocardiography (MCG) is a noninvasive technique that allows to measure the cardiac magnetic fields generated by the electrical activity of the heart. Conventionally, the magnetic field distributions around the body surface are recorded by superconducting quantum interference devices (SQUIDs). The SQUID magnetometer usually requires a big cryogenic Dewar vessel and a magnetically shielded room, which makes the SQUID-based MCG system inflexible and expensive. In this paper, we introduce an unshielded MCG system based on optically-pumped magnetometers (OPMs). By operating the magnetometers in a gradiometric mode, together with magnetic-field stabilization methods, the magnetic field noise from surroundings is suppressed and a noise floor of 10{fT}{cm}{Hz} ) is achieved under a bias field of 54, 500 nT. With the MCG system, we successfully observe the MCG signal including P-wave, the QRS complex and the T-wave and further measure the MCG signal distribution around the chest in unshielded environment.
AB - Magnetocardiography (MCG) is a noninvasive technique that allows to measure the cardiac magnetic fields generated by the electrical activity of the heart. Conventionally, the magnetic field distributions around the body surface are recorded by superconducting quantum interference devices (SQUIDs). The SQUID magnetometer usually requires a big cryogenic Dewar vessel and a magnetically shielded room, which makes the SQUID-based MCG system inflexible and expensive. In this paper, we introduce an unshielded MCG system based on optically-pumped magnetometers (OPMs). By operating the magnetometers in a gradiometric mode, together with magnetic-field stabilization methods, the magnetic field noise from surroundings is suppressed and a noise floor of 10{fT}{cm}{Hz} ) is achieved under a bias field of 54, 500 nT. With the MCG system, we successfully observe the MCG signal including P-wave, the QRS complex and the T-wave and further measure the MCG signal distribution around the chest in unshielded environment.
KW - Magnetocardiography
KW - multi-channel
KW - optically-pumped magnetometer
KW - unshielded
UR - https://www.scopus.com/pages/publications/85123043671
U2 - 10.1109/EFTF/IFCS52194.2021.9604275
DO - 10.1109/EFTF/IFCS52194.2021.9604275
M3 - Conference contribution
AN - SCOPUS:85123043671
T3 - 2021 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2021 - Proceedings
BT - 2021 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2021 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2021 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2021 - Proceedings
Y2 - 7 July 2021 through 17 July 2021
ER -