Magnetoencephalography with an atomic magnetometer

H. Xia, A. Ben-Amar Baranga, D. Hoffman, M. V. Romalis

Research output: Contribution to journalArticle

248 Scopus citations

Abstract

The authors demonstrate detection and mapping of brain magnetic fields evoked by auditory stimulation with a noncryogenic magnetometer based on spin precession of potassium atoms in spin-exchange-relaxation-free regime. Optical readout using a photodiode array allows flexibility in detector placement while using common elements for most components of the multichannel system. Absence of a cryogenic dewar eliminates magnetic Johnson noise from radiation shields and allows the use of a compact magnetic shield with a high shielding factor. The magnetometer sensitivity is currently equal to 3.5 fT Hz12 at 10 Hz, similar to superconducting quantum interference device magnetoencephalography systems.

Original languageEnglish (US)
Article number211104
JournalApplied Physics Letters
Volume89
Issue number21
DOIs
StatePublished - Dec 15 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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