期刊
NEUROIMAGE
卷 89, 期 -, 页码 143-151出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2013.10.040
关键词
Atomic magnetometer; Auditory evoked field; Biomedical signal processing; Magnetoencephalography
资金
- NIH
- Packard Foundation (US
- Korea Research Foundation and KRISS (Korea)
- Slovene Research Agency and MORS (Slovenia)
Atomic magnetometers are emerging as an alternative to SQUID magnetometers for detection of biological magnetic fields. They have been used to measure both the magnetocardiography (MCG) and magnetoencephalography (MEG) signals. One of the virtues of the atomic magnetometers is their ability to operate as a multi-channel detector while using many common elements. Here we study two configurations of such a multi-channel atomic magnetometer optimized for MEG detection. We describe measurements of auditory evoked fields (AEF) from a human brain as well as localization of dipolar phantoms and auditory evoked fields. A clear N100m peak in AEF was observed with a signal-to-noise ratio of higher than 10 after averaging of 250 stimuli. Currently the intrinsic magnetic noise level is 4 fIEz(-1/2) at 10 Hz. We compare the performance of the two systems in regards to current source localization and discuss future development of atomic MEG systems. (C) 2013 Elsevier Inc. All rights reserved.
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