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(A) 9-channel MCG. * Sensor tower containing the cryostat with nine SQUIDs; ** Gantry tower containing the cryostat and SQUID electronics; *** Couch for sequential mapping from four positions over the chest (also shown at the bottom). (B) 36-channel MCG. This system maps the same grid points with a single recording.
SQUID = super conducting quantum interference device.
