Measurements of Biomagnetic Fields Using a High-Resolution DC-SQUID Magnetometer

Abstract

We have developed a multi-channel high-resolution SQUID magnetometer. This system consists of 12-channel pick-up coils 5 mm in diameter located on a 7.5 mm grid. The base-line of the gradiometer is 15 mm. The distance between the pick-up coil and the outside surface of the dewar is 5 mm. We measured the magnetic field produced by the activity of the orbicular muscle of eye, the magnetocardiogram produced by a human, and the magnetocardiogram produced by a rat. It is possible to obtain signals with good spatial resolution.