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1.发明授权
公开(公告)号：EP1112507B8
公开(公告)日：2004-05-26
申请号：EP99941743.9
申请日：1999-08-23
IPC分类号： G01R33/383
CPC分类号： G01R33/383 , G01R33/3804 , G01R33/389
摘要： Apparatus is provided for generating an accurate magnetic field in a magnetic resonance imaging device. The device comprises a number of permanent magnet assemblies (1) each of which is in thermal contact with a plate (5) having good thermal conductivity, the plate (5) is positioned between said permanent magnetic assemblies (1) and gradient coils (3). The plate (5) has connected thereto one or more temperature sensors (7) which provide a signal to control circuit (8) which is arranged to control the operation to a plurality of thermoelectric heat pumping devices (9) which are connected to a plate (5) so that the overall heat generated by the heat pumping devices (9) and the gradient coils (3) is kept constant and is dissipated by a yoke (10) of the magnetic resonance imaging apparatus.
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2.发明公开
公开(公告)号：EP1112507A1
公开(公告)日：2001-07-04
申请号：EP99941743.9
申请日：1999-08-23
IPC分类号： G01R33/383
CPC分类号： G01R33/383 , G01R33/3804 , G01R33/389
摘要： Apparatus is provided for generating an accurate magnetic field in a magnetic resonance imaging device. The device comprises a number of permanent magnet assemblies (1) each of which is in thermal contact with a plate (5) having good thermal conductivity, the plate (5) is positioned between said permanent magnetic assemblies (1) and gradient coils (3). The plate (5) has connected thereto one or more temperature sensors (7) which provide a signal to control circuit (8) which is arranged to control the operation to a plurality of thermoelectric heat pumping devices (9) which are connected to a plate (5) so that the overall heat generated by the heat pumping devices (9) and the gradient coils (3) is kept constant and is dissipated by a yoke (10) of the magnetic resonance imaging apparatus.
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公开(公告)号：EP1360517A1
公开(公告)日：2003-11-12
申请号：EP02719773.0
申请日：2002-02-01
IPC分类号： G01R33/38
CPC分类号： G01R33/3806 , G01R33/3815
摘要： The present invention relates to magnets and to magnetic resonance imaging systems. The magnet is open with magnetic coils arranged in quadrant, separated about two perpendicular planes, a midplane and a plane of reflection, and wherein the windings are configured such that, in operation, current flow is symmetrical about the plane of refection and anti-symmetrical about the midplane, to produce a nett magnetic field at the centre in a direction perpendicular to the plane of reflection.
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4.发明授权
公开(公告)号：EP1112507B1
公开(公告)日：2004-03-03
申请号：EP99941743.9
申请日：1999-08-23
IPC分类号： G01R33/383
CPC分类号： G01R33/383 , G01R33/3804 , G01R33/389
摘要： Apparatus is provided for generating an accurate magnetic field in a magnetic resonance imaging device. The device comprises a number of permanent magnet assemblies (1) each of which is in thermal contact with a plate (5) having good thermal conductivity, the plate (5) is positioned between said permanent magnetic assemblies (1) and gradient coils (3). The plate (5) has connected thereto one or more temperature sensors (7) which provide a signal to control circuit (8) which is arranged to control the operation to a plurality of thermoelectric heat pumping devices (9) which are connected to a plate (5) so that the overall heat generated by the heat pumping devices (9) and the gradient coils (3) is kept constant and is dissipated by a yoke (10) of the magnetic resonance imaging apparatus.
摘要翻译： 提供了用于在磁共振成像装置中产生精确磁场的装置。 该装置包括多个永磁体组件（1），每个永磁体组件都与具有良好导热性的板（5）热接触，板（5）位于所述永磁组件（1）和梯度线圈（3）之间 ）。 板（5）上连接有一个或多个温度传感器（7），该温度传感器向控制电路（8）提供信号，该控制电路布置成控制连接到板的多个热电热泵装置（9） （5），使得由热泵装置（9）和梯度线圈（3）产生的总体热量保持恒定并由磁共振成像设备的磁轭（10）消散。
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公开(公告)号：EP1226448A1
公开(公告)日：2002-07-31
申请号：EP00966328.7
申请日：2000-10-12
IPC分类号： G01R33/38
CPC分类号： G01R33/3806 , G01R33/3815 , G01R33/3875
摘要： 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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公开(公告)号：EP1112506A1
公开(公告)日：2001-07-04
申请号：EP99940395.9
申请日：1999-08-23
IPC分类号： G01R33/383
CPC分类号： G01R33/383 , G01R33/3804
摘要： A temperature control system for a permanent magnet system having at least one magnetic assembly, which is mounted in thermal contact with a yoke via a plurality of thermoelectric heat pumping devices, and having at least one temperature sensor connected to an electronic control circuit, said thermoelectric heat pumping devices being connected to and controlled by said electronic control circuit which controls the current passing through said thermoelectric heat pumping devices in dependance upon the temperature, so that the permanent magnet assembly is maintained at a desired temperature enabling the permanent magnet system to generate an accurate magnetic field. The temperature control system assures a constant temperature of the permanent magnetic material, essential for accurate magnetic field for a permanent magnetic system.
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