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Magnetoencephalography with an atomic magnetometer
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup for optical magnetoencephalography system. The total distance between the probe beam and the room-temperature surface is , limited in part by optical imperfections of the K cell.

Image of FIG. 2.
FIG. 2.

Magnetic noise spectrum of the magnetometer obtained with six-channel photodetector. Dotted line: single channel noise. Solid line: intrinsic magnetometer noise determined from the noise in the difference between two adjacent channels separated by .

Image of FIG. 3.
FIG. 3.

(Color) Auditory evoked magnetic fields obtained with atomic magnetometer after averaging 600 stimuli presentations. Magnetic fields recorded with a six-channel linear photodetector [panel (a)] and magnetic field gradient determined from the difference between the two outermost channels [panel (c)] as a function of time. The magnetic field background fluctuations [seen, for example, before the auditory stimulus in panel (a)] are significantly reduced in the gradient measurement. The spatial dependence of the magnetic field at after the stimulus is shown in panel (b) with a dipolar field fit. 2D spatial distribution of magnetic fields recorded with photodiode array at after the stimulus is shown in panel (d).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetoencephalography with an atomic magnetometer