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.
@article{arxiv.physics/0611290,
title = {Multi-Channel SQUID System for MEG and Ultra-Low-Field MRI},
author = {Vadim S. Zotev and Andrei N. Matlachov and Petr L. Volegov and Henrik J. Sandin and Michelle A. Espy and John C. Mosher and Algis V. Urbaitis and Shaun G. Newman and Robert H. Kraus},
journal= {arXiv preprint arXiv:physics/0611290},
year = {2008}
}
Comments
To appear in Proceedings of 2006 Applied Superconductivity Conference