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AssigneeEricsson Inc.
InventorsJohn Brian Pendry, Ian Robert Young, Michael Charles Keogh Wiltshire, Joseph Vilmos Hajnal, David James Larkman, David John Gilderdale
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A material having magnetic permeability at r.f. frequency, for example a microstructured magnetic material has a magnetic permeability of negative value but unity magnitude over a particular r.f. frequency range. The singularity in the flux pattern has the result that magnetic resonant disturbances in a plane C,E normal to the line C,D are focussed into a plane D,F also normal to the line C,D and vice versa. This is particularly applicable to magnetic resonance apparatus, since the material can be used to transfer the r.f. magnetic flux distribution in a target region in a patient, for example at C,E to D,F where the flux may be directly measured by receive coils. Equally, transmit coils may generate flux to be focussed into the target region by the material. Magnetic resonance apparatus may be constructed which does not require gradient coils, and r.f. hypothermia may be carried out in a focussed way, minimising damage to surrounding tissue.
A material having magnetic permeability at r.f. frequency, wherein the real part of the magnetic permeability is negative with magnitude unity over a particular r.f. frequency band.
A material having magnetic permeability at r.f. frequency, in a medium, wherein the real part of the magnetic permeability of the material is negative and the real part of the magnetic permeability of the medium is positive, both material and medium having the same magnitude of magnetic permeability.
A material substantially as herein described with reference to the drawings.
Magnetic resonance apparatus substantially as herein described with reference to the drawings.
Dependencies are inferred from the claim text.