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公开(公告)号：EP0918229A2
公开(公告)日：1999-05-26
申请号：EP98308282.7
申请日：1998-10-12
发明人： Ehnholm, Gosta Jakob , Kinanen, Llmari , Gylling, Robert G. , Young, Ian R. , Demeester, Gordon D.
IPC分类号： G01R33/38
CPC分类号： G01R33/421 , G01R33/3806
摘要： A magnetic resonance imaging suite is sheathed with plates ( 32, 34, 36 ) of iron or other ferrous material. The plates define projections ( 42, 44 ) in alignment with each other on opposite ceiling and floor or wall surfaces. A pair of magnetic pole pieces ( 10, 10' ) are surrounded by superconducting electromagnetic coils ( 12, 12' ). The pole pieces are positioned between the ferrous plates in axial alignment. When current flows through the electromagnetic coils, magnetic flux flows between the pole pieces. The ferrous wall sheathing or other ferrous constructions define a flux return path. The pole pieces are magnetically attracted toward each other and are each magnetically mirrored in and attracted toward the adjacent ferrous flux return path. The pole pieces are positioned relative to each other and the ferrous flux return path such that the attraction between the pole pieces is balanced by the attraction between each pole piece and its magnetically mirrored image in the adjacent ferrous material of the flux return path. Optionally, the magnets are selectively extinguished and one or both pole pieces are moved for better access to the patient.
摘要翻译： 磁共振成像套件包含铁或其他含铁材料的板（32,34,36）。 板在相对的天花板和地板或墙壁表面上限定了彼此对准的突起（42,44）。 一对磁极片（10,10'）被超导电磁线圈（12,12'）包围。 极片以轴向对准的方式定位在铁质板之间。 当电流流过电磁线圈时，磁通量在极片之间流动。 含铁壁护套或其他铁质结构限定了通量返回路径。 极片彼此磁吸引，并且各自磁性镜像并被吸引到相邻的铁流量返回路径。 极靴相对于彼此定位，并且铁质磁通返回路径使得磁极片之间的吸引力通过磁通返回路径的相邻铁质材料中的每个极片与其磁反射图像之间的吸引力平衡。 可选地，磁体被选择性地熄灭，并且一个或两个极片移动以更好地接近患者。
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公开(公告)号：EP0918229A3
公开(公告)日：2000-04-19
申请号：EP98308282.7
申请日：1998-10-12
发明人： Ehnholm, Gosta Jakob , Kinanen, Llmari , Gylling, Robert G. , Young, Ian R. , Demeester, Gordon D.
IPC分类号： G01R33/38
CPC分类号： G01R33/421 , G01R33/3806
摘要： A magnetic resonance imaging suite is sheathed with plates ( 32, 34, 36 ) of iron or other ferrous material. The plates define projections ( 42, 44 ) in alignment with each other on opposite ceiling and floor or wall surfaces. A pair of magnetic pole pieces ( 10, 10' ) are surrounded by superconducting electromagnetic coils ( 12, 12' ). The pole pieces are positioned between the ferrous plates in axial alignment. When current flows through the electromagnetic coils, magnetic flux flows between the pole pieces. The ferrous wall sheathing or other ferrous constructions define a flux return path. The pole pieces are magnetically attracted toward each other and are each magnetically mirrored in and attracted toward the adjacent ferrous flux return path. The pole pieces are positioned relative to each other and the ferrous flux return path such that the attraction between the pole pieces is balanced by the attraction between each pole piece and its magnetically mirrored image in the adjacent ferrous material of the flux return path. Optionally, the magnets are selectively extinguished and one or both pole pieces are moved for better access to the patient.
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