Magnetoencephalography with an atomic magnetometer

作者：Hui Xia, A. Ben-Amar Baranga, Dan Hoffman, Michael Romalis · 发表于：Applied Physics Letters · 年份：2006 · DOI：10.1063/1.2392722 · 被引用次数：455 · 研究领域：Atomic and Subatomic Physics Research、Advanced MRI Techniques and Applications、Functional Brain Connectivity Studies

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 3.5fT∕Hz1∕2 at 10Hz, similar to superconducting quantum interference device magnetoencephalography systems.