A bi-planar coil system for nulling background magnetic fields in scalp mounted magnetoencephalography

Holmes, Niall and Leggett, James and Boto, Elena and Roberts, Gillian and Hill, Ryan M. and Tierney, Tim M. and Shah, Vishal and Barnes, Gareth R. and Brookes, Matthew J. and Bowtell, Richard (2018) A bi-planar coil system for nulling background magnetic fields in scalp mounted magnetoencephalography. NeuroImage . ISSN 1095-9572 (In Press)

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Small, commercially-available Optically Pumped Magnetometers (OPMs) can be used to construct a wearable Magnetoencephalography (MEG) system that allows large head movements to be made during recording. The small dynamic range of these sensors however means that movement in the residual static magnetic field found inside typical Magnetically Shielded Rooms (MSR) can saturate the sensor outputs, rendering the data unusable. This problem can be ameliorated by using a set of electromagnetic coils to attenuate the spatially-varying remnant field. Here, an array of bi-planar coils, which produce an open and accessible scanning environment, were designed and constructed. The coils were designed using a harmonic minimisation method previously used for gradient coil design in Magnetic Resonance Imaging (MRI). Six coils were constructed to null

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Depositing User: Eprints, Support
Date Deposited: 18 Jul 2018 11:09
Last Modified: 18 Jul 2019 04:30
URI: http://eprints.nottingham.ac.uk/id/eprint/53007

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