CHARACTER AND ACQUISITION OF MULTICHANNEL BIOMAGNETIC DATA

During the past several years, biomagnetometers have evolved from sing le channel units to complex whole-cortex multichannel systems. Success ful operation of such systems requires good noise cancellation and low levels of residual noise (in both shielded and unshielded environment s). These requirements impose certain limits on dynamic range, slew ra te, linearity and inter-channel matching, which must be achieved by th e processing electronics and data acquisition system when coupled to t he large number of SQUID channels. (C) 1998 Elsevier Science Ltd. All rights reserved.