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Open MRI magnet assembly with paired planar driving coils having opposite current flows and a racetrack, nested, or substantially-planar multi-coil shape
Open MRI magnet assembly with paired planar driving coils having opposite current flows and a racetrack, nested, or substantially-planar multi-coil shape
The present invention provides a magnet assembly (30a, 30b) comprising a pair of drive coils (31a, 31b; 32a, 32b; 33a, 33b) symmetrically disposed with respect to a reference plane. The reference plane is located approximately equidistant between the drive coils. Each of the drive coils has a current flowing through it which is in the opposite sense to the current flowing through the other drive coil, such that a primary magnetic field is generated in a plane which is parallel to and substantially coincident with the reference plane. The assembly may comprise further compensating coils (44a, 45a, 46a) which are configured to generate a magnetic field to improve homogeneity of the primary magnetic field. The drive coils and the compensating coils are generally in the shape of a racetrack and are preferably superconducting coils.
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机译：本发明提供了一种磁体组件（ 30 a ，30 b ），该磁体组件包括一对驱动线圈（< B> 31 a ，31 b ; 32 a < B>，32 b ; 33 a ，33 b ）相对于参考平面对称设置。参考平面位于驱动线圈之间大致等距。每个驱动线圈具有流过它的电流，该电流与流过另一个驱动线圈的电流相反，从而在与参考平面平行并基本重合的平面中产生一次磁场。该组件可以包括其他补偿线圈（ 44 a ，45 a ，46 a ），它们被配置为生成磁场以改善一次磁场的均匀性。驱动线圈和补偿线圈通常为跑道的形状，并且优选为超导线圈。
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