Abstract
We have developed a precise off-diagonal magnetoimpedance (MI) gradiometer that can operate in an unshielded environment and at room temperature with 200 pT root-mean-square noise in a 100 Hz bandwidth. The MI sensor probe is compact and easy to handle. The achieved noise level corresponds approximately to the maximum magnetocardiography (MCG) signal reported so far. We have performed MCG measurements using the developed gradiometer system in an unshielded environment, and a real-time signal like MCG can be identified by the MI gradiometer when the distance between the sensor head and chest surface is less than 3 mm. However, the signal seems to be affected by the movement of the chest surface caused by the heartbeat. A peak magnetic signal of 100 pT (corresponding to conventional MCG) was observed when the sensor head was set 10 mm apart from the chest surface to avoid the influence of the chest movement. Under such conditions, the signal needed to be averaged over more than 50 cycles to identify the peak magnetic signal.
Highlights
Magnetocardiography (MCG) is a noninvasive, noncontact tool for the diagnosis of heart diseases
We developed a precise first-order off-diagonal MI gradiometer for the purpose of future medical use as an MCG device
The peak magnetic signal intensity of 100 pT was observed when the front edge of the sensor head was set 10 mm apart from the chest surface
Summary
Magnetocardiography (MCG) is a noninvasive, noncontact tool for the diagnosis of heart diseases. The possibility of MCG measurement using a room-temperature flux gate sensor has been reported.[2] A flux gate sensor with a probe a few centimeters in length can achieve a picotesla per square-root hertz noise level. The peak magnetic signal intensity of 100 pT (a value which corresponds to a conventional MCG) was observed when the front edge of the sensor head was set 10 mm apart from the chest surface. Under these conditions, the signal needed to be averaged over more than 50 cycles to identify the peak magnetic signal
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