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71. 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。

72. 发明授权

US5363077A MRI magnet having a vibration-isolated cryocooler 失效
标题翻译： MRI磁体具有振动隔离的低温冷却器
公开(公告)号：US5363077A
公开(公告)日：1994-11-08
申请号：US188878
申请日：1994-01-31
申请人： Kenneth G. Herd , Evangelos T. Laskaris , Thompson Paul S.
发明人： Kenneth G. Herd , Evangelos T. Laskaris , Thompson Paul S.
IPC分类号： F17C13/00 , F25D19/00 , G01R33/3815 , H01F1/00 , F25B19/00
CPC分类号： F25D19/006 , G01R33/3815 , H01F6/04
摘要： A magnetic resonance imaging magnet includes a cryocooler penetration assembly and a superconducting coil assembly. The cryocooler penetration assembly has a thermal station within a thermal box within a vacuum vessel. The superconducting coil assembly has a magnet cartridge within a thermal shield within a vacuum enclosure. A flexible bellows hermetically connects the vacuum vessel and the vacuum enclosure. A first rigid thermal busbar is rigidly attached to the thermal shield, and a first flexible thermal busbar thermally connects the thermal box and the first rigid thermal busbar. A second rigid thermal busbar is rigidly attached to the magnet cartridge, and a second flexible thermal busbar thermally connects the second rigid thermal busbar and the thermal station. The weight of the cryocooler penetration assembly is supported independent of the superconducting coil assembly which, together with the flexible connections, isolates the vibrations of the cryocooler coldhead (which is attached to the cryocooler penetration assembly) from the superconducting coil assembly thereby improving imaging quality.
摘要翻译：磁共振成像磁体包括低温冷却器穿透组件和超导线圈组件。低温冷却器穿透组件在真空容器内的热箱内具有加热站。超导线圈组件具有在真空外壳内的热屏蔽内的磁体盒。柔性波纹管密封地连接真空容器和真空外壳。第一刚性热母线刚性地连接到热屏蔽，并且第一柔性热母线热连接热箱和第一刚性热母线。第二刚性热母线刚性地附接到磁体盒，并且第二柔性热母线热连接第二刚性热母线和热电站。独立于超导线圈组件支撑低温冷却器穿透组件的重量，该超导线圈组件与柔性连接件一起将低温冷却器冷却头（其连接到低温冷却器穿透组件）的振动与超导线圈组件隔离，从而提高成像质量。

73. 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。

74. 发明授权

US5153546A Open MRI magnet 失效
标题翻译：打开MRI磁铁
公开(公告)号：US5153546A
公开(公告)日：1992-10-06
申请号：US709528
申请日：1991-06-03
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： H01F7/20 , A61B5/055 , G01R33/28 , G01R33/38 , H01F6/00
CPC分类号： G01R33/3806 , G01R33/28
摘要： In an open MRI magnet, the magnet is capable of being rotated such that a patient can be imaged while either lying down or standing up. The open MRI magnet is rotated about a pivot located upon a pedestal.

75. 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.

76. 发明授权

US5023584A Magnet cartridge for magnetic resonance magnet 失效
标题翻译：磁共振磁铁磁铁
公开(公告)号：US5023584A
公开(公告)日：1991-06-11
申请号：US395636
申请日：1989-08-17
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： H01F7/20 , H01F6/00 , H01F6/04
CPC分类号： H01F6/04
摘要： A cylindrical sleeve of thermally conductive material is provided together with two epoxy impregnated superconductive coils. The cylindrical sleeve defines a circumferentially extending rabbet on either end of the sleeve on the inner diameter. The edge of the outer diameter of each coil is secured in one of the rabbets in the sleeve.

77. 发明授权

US4924198A Superconductive magnetic resonance magnet without cryogens 失效
标题翻译：超导磁共振磁体无冷冻
公开(公告)号：US4924198A
公开(公告)日：1990-05-08
申请号：US215165
申请日：1988-07-05
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： G01R33/20 , A61B5/055 , F25B9/00 , G01R33/381 , G01R33/3815 , H01F6/04 , H01F7/20 , H01L39/04
CPC分类号： G01R33/3815
摘要： A superconductive magnet for magnetic resonance imaging not requiring consumable cryogens or requiring cryogen liquid or vapor cooling of superconducting coils is provided having a resin impregnated coil of superconductor wire. Heat conductive means having a thermal conductivity greater than the resin, contact the impregnated coil along the length of at least one of the impregnated coil surfaces. A thermal radiation shield is spaced away from and surrounds the resin impregnated coil and heat conductive means. An evacuable housing is spaced away from and surrounds the shield. The housing supports the shield, heat conductive means and the impregnated coil. A multiple stage cryocooler is mounted in the housing with one stage of the cryocooler thermally coupled to the radiation shield and with another stage capable of achieving lower temperatures than the stage coupled to the shield, thermally coupled to the heat conductive means, so that superconductive operation in a vacuum can occur without the coil being immersed in cryogen liquid or vapor.

78. 发明授权

US4800354A Superconducting magnetic resonance magnet and method of making same 失效
标题翻译：超导磁共振磁铁及其制造方法
公开(公告)号：US4800354A
公开(公告)日：1989-01-24
申请号：US97572
申请日：1987-09-16
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： G01R33/20 , A61B5/055 , A61B10/00 , G01R33/38 , G01R33/3815 , H01F6/00 , H01F7/22
CPC分类号： G01R33/3815
摘要： A magnetic resonance superconductor magnet is provided comprising a cylindrical coil form having a plurality of circumferential grooves. Superconductor wire is wrapped under tension in each of the circumferential grooves. The superconductor wire in each groove forms a main magnet coil. The start and finish ends of the overwrapped wire are electrically shorted.

79. 发明授权

US4635451A Spring loaded valve for adding cryogenic liquid to a cryostat 失效
标题翻译：用于向低温恒温器加入低温液体的弹簧加载阀
公开(公告)号：US4635451A
公开(公告)日：1987-01-13
申请号：US826051
申请日：1986-02-04
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： F17C9/00 , F25B19/00
CPC分类号： F17C9/00 , F17C2203/0687 , F17C2221/014 , F17C2221/017 , F17C2270/0536 , Y10S505/897
摘要： A spring loaded valve for use with a cryostat insert is provided for selectively directing liquid cryogen to the bottom or top of a supercoolable vessel. The spring loaded valve situated at the tip of the insert extends into a housing in the top of the supercoolable vessel. A slidably mounted sleeve extends inside a cryogen fill tube. The sleeve is spring loaded and when the valve is inserted in the housing the fill tube covers apertures in the sleeve allowing fluid to flow from the fill tube through the end of the housing past the valve head. When the spring loaded valve is partially retracted from the housing the holes in the sleeve are uncovered and liquid can flow from the fill tube to a passageway in the housing extending to the bottom of the supercoolable vessel. The valve closes the aperture leading to the upper portion of the vessel.
摘要翻译：提供用于低温恒温器插入件的弹簧加载阀，用于选择性地将液体冷冻剂引导到过冷却容器的底部或顶部。位于刀片尖端的弹簧加载阀延伸到过冷却容器顶部的壳体中。可滑动安装的套筒延伸在冷冻剂填充管内。套筒是弹簧加载的，并且当阀被插入壳体中时，填充管覆盖套筒中的孔，允许流体从填充管流过壳体的端部经过阀头。当弹簧加载的阀部分地从壳体缩回时，套筒中的孔未被覆盖，并且液体可以从填充管流动到壳体中延伸到过冷却容器的底部的通道。阀关闭通向容器上部的孔。

80. 发明授权

US4526015A Support for cryostat penetration tube 失效
标题翻译：支持低温恒温穿透管
公开(公告)号：US4526015A
公开(公告)日：1985-07-02
申请号：US661013
申请日：1984-10-15
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： F17C6/00 , F17C3/08 , F17C13/08 , F25B19/00
CPC分类号： F17C13/087 , F17C3/085 , F17C2203/0391 , F17C2203/0687 , F17C2221/017 , F17C2223/0161 , F17C2270/0536 , Y10S220/901 , Y10S285/904 , Y10S505/892
摘要： Penetration tubes extending between inner and outer walls of a cryostat necessarily comprise thin walled structures to minimize thermal conduction. However, in cryostat structures in which the inner vessel is capable of undergoing the relative motion with respect to the outer vessel, particularly during transport and thermal contraction, a means of accommodating this motion must be found which does not impose significant stresses on the thin walled penetration tube. Accordingly, the present invention provides a bearing and bellows arrangement which accommodates axial motion, thermal expansion and contraction and rocking motions of the inner cryostat, while at the same time ensuring the maintenance of vacuum conditions between the cryostat walls.
摘要翻译：在低温恒温器的内壁和外壁之间延伸的穿透管必须包括薄壁结构以最小化热传导。然而，在内容器能够相对于外容器进行相对运动的低温恒温器结构中，特别是在运输和热收缩期间，必须发现容纳该运动的装置，其不会在薄壁上施加显着的应力穿透管。因此，本发明提供一种轴承和波纹管装置，其适应内部低温恒温器的轴向运动，热膨胀和收缩以及摇摆运动，同时确保维持低温恒温器壁之间的真空条件。

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