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Abstract #0303

Relating external magnetic field changes to head movement using motion and field cameras

Laura I. Bischoff1, James A. Smith1, Olivier E. Mougin1, Glyn S. Spencer1, Kingkarn Aphiwatthanasumet1, Penny A. Gowland1, and Richard W. Bowtell1

1Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom

The effect of head movement in high-field MRI is assessed by measuring changes in the spatial pattern of magnetic field perturbation, generated outside the head, using a set of 16 NMR probes fixed into a specially constructed coil mount. Information from the field probes was combined with head position measurements provided by an optical tracking system and quantitative relations between field and position changes were characterised. By relating the field probe and optical tracking measurements, acquired in a training-phase, it was possible to predict head movements based solely on measured magnetic field changes made in subsequent recordings.

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