Magnetoencephalography with an atomic magnetometer
Top Cited Papers
- 20 November 2006
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 89 (21) , 211104
- https://doi.org/10.1063/1.2392722
Abstract
The authors demonstrate detection and mapping of brainmagnetic 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 ∕ Hz 1 ∕ 2 at 10 Hz , similar to superconducting quantum interference devicemagnetoencephalography systems.Keywords
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