Human magnetoencephalogram measurements using newly developed compact module of high-sensitivity atomic magnetometer

In the field of biomagnetic measurements, optically pumped atomic magnetometers (OPAMs) are expected to be alternative sensors to magnetometers based on superconducting quantum interference devices (SQUIDs). In addition, miniaturized OPAMs are required for practical use. To address this issue, we de...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2015-02, Vol.54 (2), p.26601-1-026601-5
Main Authors: Kamada, Keigo, Sato, Daichi, Ito, Yosuke, Natsukawa, Hiroaki, Okano, Kazuhisa, Mizutani, Natsuhiko, Kobayashi, Tetsuo
Format: Article
Language:English
Subjects:
Density
Feasibility
Human
Modules
Noise
Potassium
Sensors
SQUIDs
Superconducting quantum interference devices
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Summary:In the field of biomagnetic measurements, optically pumped atomic magnetometers (OPAMs) are expected to be alternative sensors to magnetometers based on superconducting quantum interference devices (SQUIDs). In addition, miniaturized OPAMs are required for practical use. To address this issue, we developed a compact module of a high-sensitivity OPAM with a pump-probe arrangement and potassium used as the sensing atom. Because the noise spectrum density of the OPAM reached 21 fTrms/Hz1/2 at 10 Hz, we attempted to use it to measure human magnetocardiograms (MEGs). Compared with the results obtained with SQUID-based magnetometers, we could successfully observe distinct features of event-related desynchronization in the 8-13 Hz band associated with eye opening. The results demonstrate the feasibility of using the OPAM module for neuromagnetic field measurements.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.54.026601