Multi-channel atomic magnetometer for magnetoencephalography: A configuration study

Kiwoong Kim, Samo Begus, Hui Xia, Seung Kyun Lee, Vojko Jazbinsek, Zvonko Trontelj, Michael V. Romalis

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

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 4fTHz-1/2 at 10Hz. We compare the performance of the two systems in regards to current source localization and discuss future development of atomic MEG systems.

Original languageEnglish (US)
Pages (from-to)143-151
Number of pages9
JournalNeuroimage
Volume89
DOIs
StatePublished - Apr 1 2014

All Science Journal Classification (ASJC) codes

  • Neurology
  • Cognitive Neuroscience

Keywords

  • Atomic magnetometer
  • Auditory evoked field
  • Biomedical signal processing
  • Magnetoencephalography

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