Abstract
A SQUID-based MEG measurement system cooled by a GM/JT cryocooler have been developed. The system consists of 61 channels of axial gradiometers arranged on a spherical surface, and thus can conform to a human head. The white level of the system is in a range between 12 and 18 fT/Hz/sup 1/2/. The from the cryocooler controlled to a level of 15 pT by several improvements to the cryostat (e.g., using low electrical conductivity material). Since the latter have a periodic characteristics, it can be reduced by using a noise template (i.e., a digital process using a computer). The system is described here, and its performance demonstrated by using it to measuring the faint biomagnetic fields from a human brain.
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