Multi-Channel SQUID System for MEG and Ultra-Low-Field MRI
  A seven-channel system capable of performing both magnetoencephalography (MEG) and ultra-low-field magnetic resonance imaging (ULF MRI) is described. The system consists of seven second-order SQUID gradiometers with 37 mm diameter and 60 mm baseline, having magnetic field resolution of 1.2-2.8 fT/rtHz. It also includes four sets of coils for 2-D Fourier imaging with pre-polarization. The system's MEG performance was demonstrated by measurements of auditory evoked response. The system was also used to obtain a multi-channel 2-D image of a whole human hand at the measurement field of 46 microtesla with 3 by 3 mm resolution. 
Vadim S. Zotev, Andrei N. Matlachov, Petr L. Volegov, Henrik J.   Sandin, Michelle A. Espy, John C. Mosher, Algis V. Urbaiti...