Abstract
We report on a practical approach to vector biomagnetism measurement with an optically pumped magnetometer for measuring total magnetic field intensity. Its application to vector magnetocardiography is experimentally demonstrated with a compact elliptically polarized laser-pumped M x atomic magnetometer (EPMx OPM). The approach is proved to be effective and able to provide more complete cardiac magnetic information. The cardiac magnetic vectors are displayed in three-dimensional space in the form of magnetic vector loops. The sensor configuration and the image processing method here are expected to form further values, especially for multi-channel vector biomagnetism measurement, clinical diagnosis, and field source reconstruction.
Highlights
The magnetic fields generated by different organs of the human body often convey valuable information about its source
A great deal of effort has been contributed to this topic, with major areas of interest being the magnetic fields of the human heart [2,3,4,5,6], brain [7], lung [8] and eye [9]
In the present paper we propose an approach to vector magnetocardiography (VMCG) with an optically pumped magnetometers (OPMs), unlike previous work, based upon the fact that cardiac magnetic field is four or five orders of magnitude smaller than the bias magnetic field required to run the OPM
Summary
The magnetic fields generated by different organs of the human body often convey valuable information about its source. The liquid-helium-cooled dewar restricts the distance between the skin and sensor and reduces the magnetic signal strength These technical limitations hinder the clinical spread of SQUID-based MCG. A number of OPMs record magnetic field information by measuring the Larmor precession frequency of atomic spins. They essentially measure the magnitude of the total magnetic field. To achieve a complete vector magnetocardiography (VMCG) measurement with vector magnetometers, we usually arrange three adjacent sensors, respectively recording the magnetic field component in one direction. We can alternate the measurement directions by rotating a single sensor head to realize VMCG Such mechanical operations complicate the MCG device and still introduce uncertainty to the measurement results. We propose a potential cardiac diagnostic indicator by fitting the MVL plane and extracting the orientation information
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