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Abstract #3172

Field perturbations due to hollow spheres with anisotropic magnetic susceptibility

Matthew Cronin 1 , Samuel Wharton 1 , Penny Gowland 1 , and Richard Bowtell 1

1 Sir Peter Mansfield Magnetic Resonance Centre, The University of Nottingham, Nottingham, Notts, United Kingdom

The magnetic field perturbations produced when simple structures composed of materials with isotropic magnetic susceptibility are exposed to magnetic fields have been well documented, but the effect of material of anisotropic magnetic susceptibility has been less explored. Here, we experimentally investigate the field perturbations produced by spherical shells of pyrolytic graphite sheet, a material with a highly anisotropic susceptibility. It is shown that in agreement with theory, uniform, geometry-dependent field offsets are produced inside the spheres with minimal external field perturbation. The results indicate that hollow spheres with anisotropic susceptibility could form the basis of useful tunable contrast agents.

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