Experimental study demonstrates room-temperature cardiac and neural magnetic signal detection using tunnel magneto-resistance sensors, indicating potential for accessible biomagnetic diagnostic tools.
Magnetocardiography (MCG) and magnetoencephalography (MEG) signals were detected at room temperature using tunnel magneto-resistance (TMR) sensors. TMR sensors developed with low-noise amplifier circuits detected the MCG R wave without averaging, and the QRS complex was clearly observed with averaging at a high signal-to-noise ratio. Spatial mapping of the MCG was also achieved. Averaging of MEG signals triggered by electroencephalography (EEG) clearly observed the phase inversion of the alpha rhythm with a correlation coefficient as high as 0.7 between EEG and MEG.
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Fujiwara et al. (2018) studied this question.
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