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1.
Opt Express ; 24(14): 15403-16, 2016 Jul 11.
Article in English | MEDLINE | ID: mdl-27410816

ABSTRACT

We have developed a four-channel optically pumped atomic magnetometer for magnetoencephalography (MEG) that incorporates a passive diffractive optical element (DOE). The DOE allows us to achieve a long, 18-mm gradiometer baseline in a compact footprint on the head. Using gradiometry, the sensitivities of the channels are < 5 fT/Hz1/2, and the 3-dB bandwidths are approximately 90 Hz, which are both sufficient to perform MEG. Additionally, the channels are highly uniform, which offers the possibility of employing standard MEG post-processing techniques. This module will serve as a building block of an array for magnetic source localization.


Subject(s)
Brain/diagnostic imaging , Magnetoencephalography/instrumentation , Optical Devices , Magnetics
2.
Phys Med Biol ; 58(17): 6065-77, 2013 Sep 07.
Article in English | MEDLINE | ID: mdl-23939051

ABSTRACT

The authors have detected magnetic fields from the human brain with two independent, simultaneously operating rubidium spin-exchange-relaxation-free magnetometers. Evoked responses from auditory stimulation were recorded from multiple subjects with two multi-channel magnetometers located on opposite sides of the head. Signal processing techniques enabled by multi-channel measurements were used to improve signal quality. This is the first demonstration of multi-sensor atomic magnetometer magnetoencephalography and provides a framework for developing a non-cryogenic, whole-head magnetoencephalography array for source localization.


Subject(s)
Magnetoencephalography/instrumentation , Equipment Design , Evoked Potentials, Auditory , Humans
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