ABSTRACT

Since the first detection of the magnetocardiogram (MCG) in 1963 by Baule and McFee [Baule and McFee, 1963], new diagnostic information from biomagnetic signals has been widely anticipated. The first recording of the magnetoencephalogram (MEG) was made in 1968 by David Cohen [Cohen, 1968], but it was not possible to record biomagnetic signals with good signal quality before the invention of the superconducting quantum interference device (SQUID) in 1970 [Zimmerman et al., 1970].