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Abstract #0798

Residual magnetization of human subjects after exposure to magnetic fields

George Hutchinson1, Niall Holmes1, Matthew Brookes1, and Richard Bowtell1

1SIr Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom

It is known that subjects who have recently had an MRI scan can produce greater "magnetic noise" in magnetoencephalography (MEG) studies. We investigated this phenomenon, which may be related to remanent magnetization of magnetite particles that have been identified in post mortem tissue, by analyzing the field variation produced by controlled head movements in a MEG scanner, before and after subjects had been exposed to the local magnetic field of a small permanent magnet or inserted in a 3T magnet. The results show significant variability across subjects, but with a general elevation of the measured field variation after field exposure.

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