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1. 发明授权

US5884489A Superconducting magnets 失效
标题翻译：超导磁体
公开(公告)号：US5884489A
公开(公告)日：1999-03-23
申请号：US744340
申请日：1996-11-07
申请人： Patrick William Retz , Keith White
发明人： Patrick William Retz , Keith White
IPC分类号： H01F6/00 , G01R33/3815 , H01F6/06 , F25B19/00
CPC分类号： G01R33/3815 , H01F6/065
摘要： A super-conducting electro-magnet for use in an MRI system comprising a helium vessel within which magnet windings are positioned, a vacuum chamber within which the helium vessel is contained, at least one thermal shield positioned between the helium vessel and the vacuum chamber in spaced apart relationship, a service turret including a refrigerator thermally coupled to the said at least one shield for cooling purposes, a tube which extends through the turret from the windings to facilitate filling, and conductors which extend through the turret from the windings to facilitate current injection to the windings and to provide a vent for the helium gas.
摘要翻译：一种用于MRI系统的超导电磁体，包括其中定位有磁体绕组的氦容器，其中容纳氦容器的真空室，位于氦容器和真空室之间的至少一个热屏蔽间隔开的关系，包括与所述至少一个屏蔽件热耦合以用于冷却目的的冷藏库的服务转塔，从绕组延伸穿过转台以促进填充的管和从绕组延伸穿过转台的导体，以便于电流注入到绕组中并为氦气提供排气口。

2. 发明授权

US5812043A Short superconducting annular MRI electro-magnet 失效
标题翻译：短超导环形MRI电磁铁
公开(公告)号：US5812043A
公开(公告)日：1998-09-22
申请号：US626403
申请日：1996-04-02
申请人： Russell Peter Gore , Francis John Davies
发明人： Russell Peter Gore , Francis John Davies
IPC分类号： A61B5/055 , G01R33/38 , G01R33/3815 , H01F6/00 , H01F6/06 , H01F7/20 , G01V3/00
CPC分类号： G01R33/3815 , H01F6/06 , G01R33/3806
摘要： A superconducting annular electro-magnet for MRI purposes includes an annular winding within which a generally cylindrical space is provided. The winding adjacent each end of the space is formed with a chamfer to provide flaring at each end of the space.
摘要翻译：用于MRI目的的超导环形电磁体包括环形绕组，其中设置有大致圆柱形的空间。邻近该空间的两端的绕组形成有倒角，以在该空间的每个端部处提供扩口。

3. 发明授权

US5431165A MRI magnets 失效
标题翻译： MRI磁铁
公开(公告)号：US5431165A
公开(公告)日：1995-07-11
申请号：US177820
申请日：1994-01-04
申请人： Michael B. Sellers
发明人： Michael B. Sellers
IPC分类号： A61B5/055 , G01R33/3873 , H01F7/02
CPC分类号： G01R33/3873
摘要： A magnet for magnetic resonance imaging comprising a pair of poles supported on a yoke and juxtaposed to define between them an imaging volume, the poles having opposed end faces which each include shim pieces set therein, which shim pieces are adapted and arranged to be positionally adjustable in directions parallel with the longitudinal axis of the poles for the purpose of homogenizing the magnetic field in the imaging volume.
摘要翻译：一种用于磁共振成像的磁体，包括支撑在磁轭上的一对磁极并置，以便在它们之间限定成像体积，所述磁极具有相对的端面，每个磁极包括设置在其中的垫片，所述垫片适于并布置成位置可调在与磁极的纵向轴线平行的方向上，以便使成像体积中的磁场均匀化。

4. 发明授权

US06950001B2 Superconducting open MRI magnet with transverse magnetic field 失效
标题翻译：超导开放MRI磁铁与横向磁场
公开(公告)号：US06950001B2
公开(公告)日：2005-09-27
申请号：US10470922
申请日：2002-02-01
申请人： Marcel Jan Marie Kruip , Paul Beasley
发明人： Marcel Jan Marie Kruip , Paul Beasley
IPC分类号： G01R33/3815 , A61B5/055 , G01R33/38 , H01F6/00 , H01F5/00
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 reflection and anti-symmetrical about the midplane, to produce a nett magnetic field at the center in a direction perpendicular to the plane of reflection.
摘要翻译：本发明涉及磁体和磁共振成像系统。磁体开放，磁性线圈排列成四分之一，分开约两个垂直平面，一个中平面和一个反射平面，并且其中绕组被配置为使得在操作中电流是关于反射平面和反对称的对称的围绕中平面，在与反射平面垂直的方向上的中心处产生网络磁场。

5. 发明申请

US20030137379A1 Mounting scheme for NMR gradient magnet coils 有权
标题翻译： NMR梯度磁铁线圈的安装方案
公开(公告)号：US20030137379A1
公开(公告)日：2003-07-24
申请号：US10347274
申请日：2003-01-21
申请人： Oxford Magnet Technology Limited
发明人： Andrew Farquhar Atkins
IPC分类号： H01F005/00
CPC分类号： G01R33/3854
摘要： The present invention relates to the mounting of magnet coils as used in Nuclear Magnetic Resonance systems. In particular, the mounting scheme is relevant to gradient magnet assembly of such systems. Using the present invention hard contact between gradient magnet assembly and a cryostat does not occur. This allows a reduction in the transmission of mechanical vibrations and any resultant disturbance. Furthermore vibration of the gradient magnet assembly is reduced enabling improved system performances.
摘要翻译：本发明涉及用于核磁共振系统中的磁体线圈的安装。特别地，安装方案与这种系统的梯度磁铁组件相关。使用本发明不会发生梯度磁体组件和低温恒温器之间的硬接触。这允许减少机械振动的传播和任何所产生的干扰。此外，梯度磁体组件的振动减小，从而能够改善系统性能。

6. 发明授权

US5982260A MRI magnets 失效
标题翻译： MRI磁铁
公开(公告)号：US5982260A
公开(公告)日：1999-11-09
申请号：US784337
申请日：1997-01-16
申请人： Alex Francis Byrne
发明人： Alex Francis Byrne
IPC分类号： H01F27/32 , G01R33/38 , H01F5/00 , H01F6/00 , H01F6/06
CPC分类号： G01R33/3806
摘要： An open electromagnet for use in MRI apparatus includes a pair of field coils which respectively comprise juxtaposed poles between which an imaging volume of substantially homogeneous magnetic field is defined. A support structure, which serves rigidly to support the field coils in spaced apart relationship, includes two steel plates between which the field coils are positioned. The relative position of the field coils and the plates is selected such that forces of magnetic attraction between the field coils are at least partly counter-balanced by forces of attraction between the plates and the field coils. In this manner, the force on the field coils and their associated support structure due to the forces of attraction between the poles is significantly reduced or nullified.
摘要翻译：用于MRI装置的开放电磁体包括一对励磁线圈，它们分别包括并置的极点，在该磁极线圈之间限定基本上均匀的磁场的成像体积。用于以间隔开的关系支撑励磁线圈的支撑结构包括两个钢板，励磁线圈位于该两个钢板之间。选择励磁线圈和板的相对位置，使得励磁线圈之间的磁吸引力至少部分地由板和励磁线圈之间的吸引力抵消平衡。以这种方式，由于极点之间的吸引力，励磁线圈上的力及其相关联的支撑结构显着减小或无效。

7. 发明授权

US5936851A Regulated resonant converter 失效
标题翻译：调节谐振转换器
公开(公告)号：US5936851A
公开(公告)日：1999-08-10
申请号：US815187
申请日：1997-03-11
申请人： Kevin Hickman
发明人： Kevin Hickman
IPC分类号： H02M3/335 , H02M3/24
CPC分类号： H02M3/33507 , Y02B70/1433
摘要： A regulated resonant converter comprises a series resonant circuit through which current is switched alternately in opposite directions by a pair of switching transistors, a rectifier via which the switching transistors are fed with d.c. current from an a.c. mains supply input, operation of the switching transistors being controlled by signals generated in a control circuit, in dependence upon a fed-back sample of a convertor output developed in the resonant circuit in accordance with the amplitude of which regulation is effected, and a cross-over voltage associated with current reversal in an inductor which forms a part of the resonant circuit, which cross-over voltage is fed to the control circuit via a differentiator whereby switch operation is effectively enhanced.
摘要翻译：调节型谐振变换器包括串联谐振电路，电流通过一对开关晶体管在相反方向交替切换，整流器通过该整流器将开关晶体管供给直流。来自a.c. 电源输入，开关晶体管的操作由控制电路中产生的信号控制，这取决于谐振电路中根据调节幅度产生的转换器输出的反馈采样，以及交叉与形成谐振电路的一部分的电感器中的电流反转相关的过电压，该交叉电压通过微分器馈送到控制电路，从而有效地提高了开关操作。

8. 发明授权

US5701112A Cryogenic MRI magnets 失效
标题翻译：低温MRI磁铁
公开(公告)号：US5701112A
公开(公告)日：1997-12-23
申请号：US556601
申请日：1995-11-13
申请人： Daniel Edward Brown
发明人： Daniel Edward Brown
IPC分类号： G01R33/3815 , A61B5/055 , G01R33/3873 , H01F1/00
CPC分类号： G01R33/3873 , G01R33/3815
摘要： An electromagnet for use in MRI apparatus comprising an annular vessel inside which annular windings energizable to produce a magnetic field are contained together with iron components, hereinafter termed cold iron, which components are mechanically anchored with respect to the windings, and iron shim rings positioned externally of the vessel within its annular bore, hereinafter termed warm iron, the size and relative position of the shim rings being chosen so that instability of the magnetic field introduced by one shim ring, due to vibration or temperature changes, is substantially compensated for by an equal and opposite effect produced by one or more other shim rings.
摘要翻译：一种用于MRI装置的电磁铁，包括一个环形容器，在该环形容器的内部，能够产生磁场的环形绕组与铁组件（以下称为冷铁）一起包含，该组件相对于绕组机械锚定，而铁垫圈位于外部容器在其环形孔内，以下称为暖铁，选择垫圈的尺寸和相对位置，使得由振动或温度变化引起的一个垫圈引入的磁场的不稳定性基本上被由一个或多个其他垫圈产生的相等和相反的效果。

9. 发明授权

US5691678A Electromagnets 失效
标题翻译：电磁铁
公开(公告)号：US5691678A
公开(公告)日：1997-11-25
申请号：US502957
申请日：1995-07-17
申请人： Russell Peter Gore , Graham Gilgrass
发明人： Russell Peter Gore , Graham Gilgrass
IPC分类号： A61B5/055 , F17C13/08 , G01R33/3815 , H01F6/00 , H01F7/20 , H01F1/00
CPC分类号： F17C13/087 , G01R33/3815 , H01F6/04 , F17C2203/0391 , F17C2203/0629 , F17C2203/0687 , F17C2221/017 , F17C2223/0161
摘要： A superconducting electromagnet comprising an annular inner helium container vessel within which the windings of an annular magnet are contained, an outer annular vacuum chamber within which the said inner vessel is contained, and a generally annular hollow thermal shield arranged to enclose the inner vessel and disposed between the said vessel and the said chamber in spaced apart relationship so that the longitudinal axes of the said shield and the magnet are substantially co-extensive, an outer wall of the shield being defined by concentric generally cylindrical mutually spaced inner and outer thermal screens, which in combination define a double wall screen, the shield having a double wall only in a region concentric with the longitudinal axis of the magnet.
摘要翻译：一种包括环形内氦容器容器的超导电磁体，其中容纳有环形磁体的绕组，外部环形真空室，所述内部容器被容纳在该外部环形真空室中，以及布置成封闭内部容器并设置在所述容器和所述室之间的间隔开的关系中，使得所述屏蔽件和磁体的纵向轴线基本上共同延伸，所述屏蔽件的外壁由同心大致圆柱形的相互间隔的内部和外部热屏蔽限定，其组合地限定双壁屏幕，屏蔽件仅在与磁体的纵向轴线同心的区域中具有双壁。

10. 发明授权

US4777807A Cryostat assembly 失效
标题翻译：冷冻机组装
公开(公告)号：US4777807A
公开(公告)日：1988-10-18
申请号：US87528
申请日：1987-08-20
申请人： Keith White
发明人： Keith White
IPC分类号： F25D3/10 , F17C3/08 , F25B9/00 , F25D19/00 , G01R33/3815 , H01L39/04 , F25B19/00
CPC分类号： G01R33/3815 , F17C3/085 , F25D19/006
摘要： A cryostat asssembly comprises at least one substantially heat insulating wall surrounding a cooled region for restricting heat flow into the cooled region. A refrigeration system is provided having a heat absorbing portion coupled with the wall to enable heat to transfer to the heat absorbing portion, the refrigeration system also having a heat evacuating portion to enable absorbed heat to be evacuated from the cryostat assembly.
摘要翻译：低温恒温器组件包括围绕冷却区域的至少一个基本上绝热的壁，用于限制进入冷却区域的热流。提供一种制冷系统，其具有与所述壁耦合的吸热部分，以使热量能够转移到所述吸热部分，所述制冷系统还具有排热部分，以使吸收的热量能够从所述低温恒温器组件排出。

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