Magnetocardiography with a modular spin-exchange relaxation-free atomic magnetometer array.

Author: Wyllie R, Kauer M, Smetana GS, Wakai RT, Walker TG.
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA.
Conference/Journal: Phys Med Biol.
Date published: 2012 May 7
Other: Volume ID: 57 , Issue ID: 9 , Pages: 2619-32 , Word Count: 93

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.
PMID: 22504066