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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