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HTS-multichannel-system for magnetocardiography and magnetoencephalography

A new, small biomagnetic system with 8 channels operating at 77 K has been constructed. In the gantry inside the magnetically shielded room it can be shifted to five positions so that up to 40 positions can be measured successively. We employ low noise dc-SQUID magnetometers from high-temperature superconductors (HTS) to demonstrate mapping measurements of cardiac fields and measurements of somatosensory evoked signals. We compare our signals to measurements on the same volunteer with a conventional Helium cooled system based on dcSQUIDs.