title: Magnetocardiography with a modular spin-exchange relaxation-free atomic magnetometer array.
abstract: We present a portable four-channel atomic magnetometer array operating in the spin-exchange relaxation-free regime. The magnetometer array has several design features intended to maximize its suitability for biomagnetic measurement, specifically foetal magnetocardiography, such as a compact modular design and fibre-coupled lasers. The modular design allows the independent positioning and orientation of each magnetometer. Using this array in a magnetically shielded room, we acquire adult magnetocadiograms. These measurements were taken with a 6-11 fT Hz(-1/2) single-channel baseline sensitivity that is consistent with the independently measured noise level of the magnetically shielded room.
authors.affiliation: Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA. wyllie@wisc.edu
authors.forename: R
authors.initials: R
authors.lastname: Wyllie
authors.forename: M
authors.initials: M
authors.lastname: Kauer
authors.forename: G S
authors.initials: GS
authors.lastname: Smetana
authors.forename: R T
authors.initials: RT
authors.lastname: Wakai
authors.forename: T G
authors.initials: TG
authors.lastname: Walker
mesh_terms: D000328:Adult; D006801:Humans; D053798:Magnetocardiography / Q000379:methods*; D019047:Phantoms, Imaging; D017785:Photons