Oxford Magnet Technology Limited

Nicholas David Parker

Marcel Jan Marie Kruip

Peter Jonathan Davis

Francis John Davies

Alex Francis Byrne

Apparatus is provided for generating an accurate magnetic field in a magnetic resonance imaging device. The device comprises a number of permanent magnet assemblies ( ) each of which is in thermal contact with a plate ( ) having good thermal conductivity, the plate ( ) is positioned between said permanent magnetic assemblies ( ) and gradient coils ( ). The plate ( ) has connected thereto one or more temperature sensors ( ) which provide a signal to control circuit ( ) which is arranged to control the operation to a plurality of thermoelectric heat pumping devices ( ) which are connected to a plate ( ) so that the overall heat generated by the heat pumping devices ( ) and the gradient coils ( ) is kept constant and is dissipated by a yoke ( ) of the magnetic resonance imaging apparatus.

Stabilization of a magnetic field of a magnetic resonance imaging apparatus

Temperature control system for a permanent magnetic system

An open electromagnet including a pair of field coils which respectively comprise juxtaposed poles of the electromagnet between which an imaging volume of substantially homogeneous magnetic field is defined, toroidal shielding coil means arranged on a locus which forms a loop, so that when energized, the said shielding coil means produces a controlling magnetic field which configures a magnetic flux return path for the field coils so that the magnetic flux return path describes the said loop, and a support structure which serves rigidly to support the shielding coil means and the field coils.

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Harbury, United Kingdom

Nicholas David Parker