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1. 发明授权

US5439543A Apparatus and method for passive shimming of a superconducting magnet which images human limbs 失效
标题翻译：用于对人体肢体进行成像的超导磁体的被动匀场装置和方法
公开(公告)号：US5439543A
公开(公告)日：1995-08-08
申请号：US183375
申请日：1994-01-19
申请人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd , Raymond E. Gabis
发明人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd , Raymond E. Gabis
IPC分类号： G01R33/385 , G01R33/3873 , B65H81/00
CPC分类号： G01R33/3873 , G01R33/385
摘要： This invention relates to an apparatus and method for providing passive shimming for a superconducting magnet of the type that has a relatively small imaging volume. Such structures of this type, generally, provide the proper amount of passive shimming for a relatively small imaging volume.
摘要翻译：本发明涉及一种用于为具有相对小的成像体积的类型的超导磁体提供被动匀场的装置和方法。这种类型的这种结构通常为相对小的成像体积提供适当量的被动匀场。

2. 发明授权

US5304934A Superconducting magnet for imaging human limbs 失效
标题翻译：用于成像人体四肢的超导磁体
公开(公告)号：US5304934A
公开(公告)日：1994-04-19
申请号：US302
申请日：1993-01-04
申请人： Evangelos T. Laskaris , Bizhan Dorri , Kenneth G. Herd
发明人： Evangelos T. Laskaris , Bizhan Dorri , Kenneth G. Herd
IPC分类号： G01R33/3815 , G01R33/385 , G01R33/3873 , G01R33/20
CPC分类号： G01R33/3815 , G01R33/385 , G01R33/3873
摘要： This invention relates to a superconducting magnet of the type that has a relatively small imaging volume. Such structures of this type, generally, allow the operator to image human limbs without the use of a larger, more costly superconducting magnet.
摘要翻译：本发明涉及一种具有相对小的成像体积的超导磁体。这种类型的这种结构通常允许操作者在不使用更大，更昂贵的超导磁体的情况下对人体肢体进行成像。

3. 发明授权

US5317298A Apparatus and method for passive shimming of a superconducting magnet which images human limbs 失效
标题翻译：用于对人体肢体进行成像的超导磁体的被动匀场装置和方法
公开(公告)号：US5317298A
公开(公告)日：1994-05-31
申请号：US346
申请日：1993-01-04
申请人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd , Raymond E. Gabis
发明人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd , Raymond E. Gabis
IPC分类号： G01R33/385 , G01R33/3873 , G01V3/00
CPC分类号： G01R33/3873 , G01R33/385
摘要： This invention relates to an apparatus and method for providing passive shimming for a superconducting magnet of the type that has a relatively small imaging volume. Such structures of this type, generally, provide the proper amount of passive shimming for a relatively small imaging volume.
摘要翻译：本发明涉及一种用于为具有相对小的成像体积的类型的超导磁体提供被动匀场的装置和方法。这种类型的这种结构通常为相对小的成像体积提供适当量的被动匀场。

4. 发明授权

US5410288A Persistent superconducting switch for a superconducting magnet for imaging human limbs 失效
标题翻译：用于成像人体肢体的超导磁体的持续超导开关
公开(公告)号：US5410288A
公开(公告)日：1995-04-25
申请号：US235959
申请日：1994-05-02
申请人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd
发明人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd
IPC分类号： G01R33/3815 , H01B12/00 , H01F6/00 , H01L39/02 , H01L39/20 , H01F7/22
CPC分类号： H01L39/02 , G01R33/3815 , H01F6/003 , H01L39/20
摘要： A superconductive magnet subassembly has a single unbroken length of superconductive conductor which has a mid portion wound so as to define at least one superconductive magnetic coil and which has two end portions superconductively joined together by a superconductive joint. A superconductive switch is at least partially defined by the two end portions and by a heater for controllably heating the two end portions.
摘要翻译：超导磁体子组件具有单个不间断的超导导体，其中间部分被缠绕以限定至少一个超导磁性线圈，并且具有由超导接头超导地连接在一起的两个端部。超导开关至少部分地由两个端部限定，并且由用于可控制地加热两个端部的加热器限定。

5. 发明授权

US5396171A Field mapping fixture for a superconducting magnet for imaging human limbs 失效
标题翻译：用于成像人体肢体的超导磁体的场映射夹具
公开(公告)号：US5396171A
公开(公告)日：1995-03-07
申请号：US000345
申请日：1993-01-04
申请人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd , Raymond E. Gabis
发明人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd , Raymond E. Gabis
IPC分类号： G01R33/24 , G01R33/28
CPC分类号： G01R33/24
摘要： This invention relates to a field mapping fixture for mapping the magnetic fields of a superconducting magnet. Such structures of this type, generally, are capable of measuring the magnetic fields of a relatively small imaging volume.
摘要翻译：本发明涉及用于映射超导磁体的磁场的场映射夹具。这种类型的这种结构通常能够测量相对小的成像体积的磁场。

6. 发明授权

US5253413A Method for making a superconducting joint for a superconducting magnet which images human limbs 失效
标题翻译：制造超导磁体超导接头的方法，该超导磁体对人体肢体进行成像
公开(公告)号：US5253413A
公开(公告)日：1993-10-19
申请号：US347
申请日：1993-01-04
申请人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd , Richard A. Ranze
发明人： Bizhan Dorri , Evangelos T. Laskaris , Kenneth G. Herd , Richard A. Ranze
IPC分类号： H01L39/02 , H01L39/24
CPC分类号： H01L39/02 , Y10S505/925 , Y10S505/926 , Y10S505/927 , Y10T29/49014 , Y10T29/49194
摘要： This invention relates to a superconducting joint which is more commonly referred to as, a pigtail joint, for use in superconducting magnets. Such structures of this type, generally, exhibit total superconducting behavior at temperatures below the transition value of the superconducting joint and have high electrical resistance at temperatures above the transition point of the superconducting joint.
摘要翻译：本发明涉及一种超导接头，该超导接头通常被称为用于超导磁体的辫状接头。这种类型的这种结构通常在低于超导接头的转变值的温度下表现出全超导行为，并且在高于超导接头的转变点的温度下具有高的电阻。

7. 发明授权

US5594401A Closed superconductive magnet with uniform imaging volume 失效
标题翻译：封闭的超导磁体具有均匀的成像体积
公开(公告)号：US5594401A
公开(公告)日：1997-01-14
申请号：US603521
申请日：1996-02-20
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
IPC分类号： G01R33/38 , G01R33/3815 , G01R33/3873 , H01F6/00 , G01V3/00
CPC分类号： G01R33/3815 , G01R33/3806 , G01R33/3873
摘要： A closed magnetic resonance imaging (MRI) magnet has a single superconductive coil assembly including a toroidal-shaped coil housing containing a pair of superconductive main coils and at least one additional superconductive main coil. A pair of generally-non-permanently-magnetized ferromagnetic rings is spaced radially inward and apart from the superconductive main coils. The ferromagnetic rings allow the design of a shorter MRI magnet because the ferromagnetic rings overcome the gross magnetic field distortions in the imaging volume of the magnet (created by removing some of the additional longitudinally-outermost superconductive main coils, otherwise used in the magnet, to make the magnet shorter) to produce a magnetic field of high uniformity within the imaging volume.
摘要翻译：闭合磁共振成像（MRI）磁体具有单个超导线圈组件，其包括包含一对超导主线圈和至少一个额外的超导主线圈的环形线圈壳体。一对通常非永久磁化的铁磁环径向向内并与超导主线圈隔开。铁磁环允许设计较短的MRI磁体，因为铁磁环克服了磁体的成像体积中的总磁场失真（通过除去磁体中另外使用的一些附加的纵向最外面的超导主线圈产生，使磁体更短），以在成像体积内产生高均匀性的磁场。

8. 发明授权

US5568104A Open MRI superconductive magnet with cryogenic-fluid cooling 失效
标题翻译：用低温流体冷却打开MRI超导磁体
公开(公告)号：US5568104A
公开(公告)日：1996-10-22
申请号：US553738
申请日：1995-10-23
申请人： Evangelos T. Laskaris , Bizhan Dorri
发明人： Evangelos T. Laskaris , Bizhan Dorri
IPC分类号： G01R33/3815 , A61B5/055 , F17C13/00 , G01R33/38 , G01R33/385 , H01F6/00 , F25B19/00 , G01V3/00
CPC分类号： G01R33/3806 , H01F6/04 , G01R33/3815
摘要： An open magnetic resonance imaging (MRI) magnet having first and second spaced-apart superconductive coil assemblies each including a toroidal-shaped coil housing containing a superconductive main coil in thermal contact with a cryogenic fluid contained in a dewar. Preferably, each main coil is located outside of and in solid-conduction thermal contact with its corresponding dewar (instead of inside the dewar). Preferably, a surrounding single (not double) thermal shield is cooled by liquid cryogen boil-off or by a cryocooler coldhead. All this allows the main coil to be located closer to the magnet's open space which reduces magnet cost by reducing the amount of coil needed for the same-strength magnetic field.
摘要翻译：一种具有第一和第二间隔开的超导线圈组件的开放式磁共振成像（MRI）磁体，每个超导线圈组件包括环形线圈壳体，其包含与包含在杜瓦瓶中的低温流体热接触的超导主线圈。优选地，每个主线圈位于其相应的杜瓦瓶（而不是杜瓦瓶内）的固体传导热接触之外。优选地，周围的单个（不是双重）热屏蔽通过液体冷冻剂蒸发或者由低温冷却器冷头冷却。所有这些都允许主线圈靠近磁体的开放空间，通过减少相同强度磁场所需的线圈的数量来降低磁体成本。

9. 发明授权

US5517168A Superconducting magnet with magnetic shielding 失效
标题翻译：磁屏蔽超导磁体
公开(公告)号：US5517168A
公开(公告)日：1996-05-14
申请号：US323648
申请日：1994-10-17
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle
IPC分类号： G01R33/3815 , G01R33/421 , G01V3/00
CPC分类号： G01R33/421 , G01R33/3815
摘要： A superconductive magnet with magnetic shielding has an annularly-cylindrical-shaped housing whose first end wall and outer cylindrical wall are magnetizable (e.g., iron) walls and whose inner cylindrical wall is a non-magnetizable wall. At least one main superconductive coil is positioned within the housing and carries an electric current in a first (e.g., clockwise) direction. A first resistive (e.g., copper) deflection coil is positioned outside the housing radially proximate the outer cylindrical wall and longitudinally closer to the first end wall than to a midpoint located between the two end walls. The first deflection coil carries an electric current in an opposite direction to the first direction so that its magnetic field longitudinally pushes the stray magnetic field of the superconductive coil(s), which leaves the magnet's bore, inward to be captured by the iron first end wall.
摘要翻译：具有磁屏蔽的超导磁体具有环形圆柱形的壳体，其第一端壁和外圆柱形壁是可磁化的（例如铁）壁，并且其内圆柱形壁是不可磁化的壁。至少一个主超导线圈定位在壳体内并且以第一（例如，顺时针）方向承载电流。第一电阻（例如铜）偏转线圈位于外壳的径向附近的外圆柱形壁处并且纵向更靠近第一端壁而不是位于两个端壁之间的中点。第一偏转线圈沿着与第一方向相反的方向承载电流，使得其磁场纵向推动离开磁体孔的超导线圈的杂散磁场向内以被铁第一端捕获壁。

10. 发明授权

US5442928A Hybrid cooling system for a superconducting magnet 失效
标题翻译：用于超导磁体的混合冷却系统
公开(公告)号：US5442928A
公开(公告)日：1995-08-22
申请号：US286368
申请日：1994-08-05
申请人： Evangelos T. Laskaris , Bizhan Dorri
发明人： Evangelos T. Laskaris , Bizhan Dorri
IPC分类号： F17C3/08 , F17C13/00 , F25B25/00 , G01R33/38 , G01R33/3815 , F25B19/00
CPC分类号： F17C3/085 , F25B25/005 , G01R33/3815 , H01F6/065 , F17C2201/0157 , F17C2203/013 , F17C2203/0391 , F17C2203/0663 , F17C2203/0687 , F17C2221/017 , F17C2223/0161 , F17C2227/0353 , F17C2270/0509 , F17C2270/0536 , G01R33/3806 , Y10S505/892
摘要： A cooling system for a superconductive magnet. A dewar, located outside the magnet, includes a vacuum jacket hermetically connected to the magnet's vacuum enclosure and includes liquid helium located within the vacuum jacket. A thermal busbar is located within and spaced apart from the hermetically connected vacuum jacket and vacuum enclosure. The thermal busbar has a first end located within the vacuum jacket and a second end located within the vacuum enclosure and in thermal contact with the magnet's superconductive coil. A cryocooler coldhead, located outside the vacuum enclosure, has a housing located outside the vacuum jacket and has a cold stage extending from the housing to inside the vacuum jacket to re-liquefy any helium boiled-off in cooling the magnet 10.
摘要翻译：一种用于超导磁体的冷却系统。位于磁体外部的杜瓦瓶包括气密地连接到磁体真空外壳的真空夹套，并且包括位于真空夹套内的液氦。热母线位于气密连接的真空护套和真空外壳内并与之隔开。热母线具有位于真空护套内的第一端和位于真空外壳内并与磁体的超导线圈热接触的第二端。位于真空外壳外部的低温冷却器冷头具有位于真空护套外部的壳体，并且具有从壳体延伸到真空夹套内部的冷阶段，以在冷却磁体10时重新液化任何氦气沸腾。

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