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21. 发明授权

US5396207A On-shoulder MRI magnet for human brain imaging 失效
标题翻译：用于人脑成像的肩关节MRI磁铁
公开(公告)号：US5396207A
公开(公告)日：1995-03-07
申请号：US286363
申请日：1994-08-05
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： A61B5/055 , G01R33/38 , G01R33/3815 , G01R33/20 , H01F7/22
CPC分类号： G01R33/3815 , G01R33/3806
摘要： A magnetic resonance imaging (MRI) magnet having an annularly cylindrical-shaped vacuum enclosure with a longitudinal axis, first and second longitudinal ends, a first larger diameter bore extending from the first towards the second longitudinal end, and a second smaller diameter bore extending from the second longitudinal end to the first bore. First and second superconductive coils are placed in the vacuum enclosure with the first coil generally circumferentially surrounding the first bore and the second coil circumferentially surrounding the second bore, wherein the radial distance of the radially innermost portion of the second coil from the axis is smaller than the radius of the first bore. The second longitudinal end of the vacuum enclosure fits on a patient's shoulders with the patient's head passing through the second bore and extending into the first bore for MRI brain imaging.
摘要翻译：一种磁共振成像（MRI）磁体，其具有带有纵向轴线的环形圆柱形真空外壳，第一和第二纵向端部，从第一至第二纵向端部延伸的第一较大直径的孔，以及从第第二纵向端到第一孔。第一和第二超导线圈被放置在真空壳体中，其中第一线圈大致周向地围绕第一孔，第二线圈周向围绕第二孔，其中第二线圈的径向最内部分与轴线的径向距离小于第一个孔的半径。真空罩的第二纵向末端装在患者的肩膀上，患者的头部通过第二孔并延伸到第一个孔中用于MRI脑成像。

22. 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。

23. 发明授权

US5093645A Superconductive switch for conduction cooled superconductive magnet 失效
标题翻译：用于导电冷却超导磁体的超级开关
公开(公告)号：US5093645A
公开(公告)日：1992-03-03
申请号：US563584
申请日：1990-08-06
申请人： Bizhan Dorri , Evangelos T. Laskaris
发明人： Bizhan Dorri , Evangelos T. Laskaris
IPC分类号： H01F6/04 , H01F6/00 , H01H37/00 , H01H37/32
CPC分类号： H01L39/20 , H01F6/003
摘要： A superconductive switch for a superconductive magnet is bifilarly wound on a bobbin with niobium-tin tape and laminated with stainless steel foil for structural rigidity is provided. The switch is vacuum pressure epoxy impregnated and cooled by copper bus bars which are heat stationed to a cryocooler which is also used to conduction cool the superconductive magnet. The bus bars are also used to introduce a voltage across the switch and the magnet windings which are connected in series with one another to ramp up the current.

24. 发明授权

US5568110A Closed MRI magnet having reduced length 失效
标题翻译：闭合MRI磁体具有减小的长度
公开(公告)号：US5568110A
公开(公告)日：1996-10-22
申请号：US603522
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： G01R33/3815 , G01R33/3875 , H01F6/06 , G01V3/00
CPC分类号： G01R33/3815 , G01R33/3875
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. A pair of generally annular-shaped bucking coils, carrying electric current in a direction opposite to that of the superconductive main coils, is spaced radially inward and apart from the superconductive main coils. The bucking coils allow the design of a shorter MRI magnet because the bucking coils 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，其包括含有一对超导主线圈的环形线圈壳体。在与超导主线圈的方向相反的方向上承载电流的一对大体呈环形的抵抗线圈与超导主线圈径向向内和间隔开。屈曲线圈允许设计较短的MRI磁体，因为降压线圈克服了磁体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。

25. 发明授权

US5565831A Shielded and open MRI magnet 失效
标题翻译：屏蔽和开放MRI磁铁
公开(公告)号：US5565831A
公开(公告)日：1996-10-15
申请号：US547083
申请日：1995-10-23
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle , Timothy J. Havens
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle , Timothy J. Havens
IPC分类号： G01R33/421 , A61B5/055 , G01R33/38 , G01R33/3815 , H01F6/00 , H05K9/00 , G01V3/00
CPC分类号： G01R33/3806 , G01R33/3815
摘要： A shielded and open magnetic resonance imaging (MRI) magnet having two spaced-apart, generally toroidal-shaped superconductive coil assemblies. Each coil assembly has a coil housing containing a generally annular-shaped superconductive main and a radially-outwardly spaced-apart shielding coil carrying electric currents in opposing directions. Preferably, supplemental shielding is provided with the addition of: a generally annular permanent magnet configuration internal to, or external of, the coil housings; a generally-non-permanently-magnetized external ferromagnetic shield having at least a portion positioned longitudinally between the coil housings, an external resistive coil; or combinations thereof.
摘要翻译：具有两个间隔开的大致环形形状的超导线圈组件的屏蔽和开放磁共振成像（MRI）磁体。每个线圈组件具有线圈壳体，其包含大致环形的超导主体和沿相反方向承载电流的径向向外间隔开的屏蔽线圈。优选地，补充屏蔽被提供有：线圈壳体内部或外部的大致环形的永磁体构造; 一个非永久磁化的外部铁磁屏蔽件，至少有一部分纵向位于线圈壳体之间，一个外部电阻线圈; 或其组合。

26. 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。

27. 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。

28. 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。

29. 发明授权

US5179338A Refrigerated superconducting MR magnet with integrated gradient coils 失效
标题翻译：具有集成梯度线圈的冷冻超导MR磁体
公开(公告)号：US5179338A
公开(公告)日：1993-01-12
申请号：US759337
申请日：1991-09-13
申请人： Evangelos T. Laskaris , Peter B. Roemer , Bizhan Dorri , Mark E. Vermilyea
发明人： Evangelos T. Laskaris , Peter B. Roemer , Bizhan Dorri , Mark E. Vermilyea
IPC分类号： G01R33/3815 , G01R33/385 , G01R33/3873 , G01R33/422
CPC分类号： G01R33/385 , G01R33/3815 , G01R33/3873 , G01R33/422
摘要： The invention relates to refrigerated superconducting MR magnets having integrated gradient coils. In particular, the amount of eddy currents produced by the magnet are substantially reduced while reducing the size and weight, and, therefore, the cost of the superconducting magnet required to produce an MR image.
摘要翻译：本发明涉及具有积分梯度线圈的冷冻超导MR磁体。特别地，磁体产生的涡流的量大大减小，同时减小了产生MR图像所需的超导磁体的尺寸和重量，并因此降低了超导磁体的成本。

30. 发明授权

US4926647A Cryogenic precooler and cryocooler cold head interface receptacle 失效
标题翻译：低温预冷器和冷冻机冷头接口插座
公开(公告)号：US4926647A
公开(公告)日：1990-05-22
申请号：US335466
申请日：1989-04-10
申请人： Bizhan Dorri , Evangelos T. Laskaris
发明人： Bizhan Dorri , Evangelos T. Laskaris
IPC分类号： F17C13/00 , F25D3/10 , F25D19/00 , H01F6/04 , H01L39/04
CPC分类号： F25D19/006 , F25D3/10 , H01F6/04 , Y10S505/892
摘要： A superconductive magnet coolable with a two stage cryocooler is provided. The superconductive magnet includes a cryostat containing a magnet winding, a thermal radiation shield surrounding the magnet winding and spaced away therefrom. The cryostat defines an aperture in which a cryocooler cold head interface receptacle is situated. The interface receptacle has a first and second heat station for connecting in a heat flow relationship with the first and second heat stations of the crycooler, respectively. A precooler has first and second stage heat exchangers connected in a heat flow relationship with the first and second heat stations of said interface, respectively. The interface has an inlet and outlet port for supplying and removing cryogens. Piping means fabricated from heat insulating material connect the first and second heat exchangers in a series flow relationship between the inlet and outlet ports.

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