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11. 发明授权

US5563566A Cryogen-cooled open MRI superconductive magnet 失效
标题翻译：低温冷却开放MRI超导磁体
公开(公告)号：US5563566A
公开(公告)日：1996-10-08
申请号：US555952
申请日：1995-11-13
申请人： Evangelos T. Laskaris , Bizhan Dorri , Robert A. Ackermann
发明人： Evangelos T. Laskaris , Bizhan Dorri , Robert A. Ackermann
IPC分类号： G01R33/3815 , A61B5/055 , G01R33/38 , H01F6/00 , H01F7/22
CPC分类号： G01R33/3806 , G01R33/3815 , Y10S505/893
摘要： An open magnetic resonance imaging (MRI) magnet having longitudinally spaced-apart superconductive main coils surrounded by a dewar containing a cryogenic liquid (e.g., liquid helium) and boiled-off cryogenic gas (e.g., helium vapor). A condenser is in physical contact with the boiled-off vapor and is in thermal contact with a cold stage of a cryocooler coldhead so as to re-liquefy the vapor. This allows the coils to be surrounded by a single (not double) thermal shield which allows the coils structurally 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：具有由包含低温液体（例如液氦）和沸腾低温气体（例如氦气））的杜瓦围绕的纵向隔开的超导主线圈的开放式磁共振成像（MRI）磁体。冷凝器与沸腾的蒸汽物理接触并与冷却器冷头的冷级热接触，以便重新液化蒸气。这允许线圈由单个（不是双重）热屏蔽围绕，其允许线圈在结构上位于更接近磁体的开放空间，从而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。

12. 发明授权

US5521571A Open MRI magnet with uniform imaging volume 失效
标题翻译：打开具有均匀成像体积的MRI磁体
公开(公告)号：US5521571A
公开(公告)日：1996-05-28
申请号：US553736
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： G01R33/38 , G01R33/3875 , G01V3/00 , H01F1/00 , H01F5/00
CPC分类号： G01R33/3806 , G01R33/3875
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. A generally annular-shaped resistive coil is associated with each coil assembly, being generally coaxially aligned with the associated coil assembly and being spaced radially inward and radially apart from the associated coil assembly's superconductive main coil. The resistive coils overcome the gross magnetic field distortions in the imaging volume of the superconductive main coils (created by the open space between the magnet's superconductive coil assemblies) to produce a magnetic field of high uniformity within the imaging volume.
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，每个包括包含超导主线圈的环形线圈壳体。大致环形的电阻线圈与每个线圈组件相关联，与相关联的线圈组件大致同轴对准，并且与相关联的线圈组件的超导主线圈径向向内和径向间隔开。电阻线圈克服了超导主线圈（由磁体的超导线圈组件之间的开放空间产生的）的成像体积中的总磁场失真，以在成像体积内产生高均匀性的磁场。

13. 发明授权

US5517169A Superconducting magnet with magnetic shielding 失效
标题翻译：磁屏蔽超导磁体
公开(公告)号：US5517169A
公开(公告)日：1996-05-14
申请号：US323649
申请日：1994-10-17
申请人： Evangelos T. Laskaris , Bizhan Dorri , Madabushi V. Chari , Gerald B. Kliman , Michele D. Ogle
发明人： Evangelos T. Laskaris , Bizhan Dorri , Madabushi V. Chari , Gerald B. Kliman , 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. An annular first permanent magnet is positioned outside the housing longitudinally proximate the first end wall. The first permanent magnet has a number of equivalent ampere turns and has a magnetic field direction oriented parallel to the axis pointing towards the second end wall so that its magnetic field longitudinally pulls 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。环形第一永久磁铁定位在外壳的纵向附近，靠近第一端壁。第一永磁体具有多个等效的安匝数，并且具有平行于指向第二端壁的轴定向的磁场方向，使得其磁场纵向拉动超导线圈的杂散磁场，其离开磁铁的内孔，被铁的第一端壁捕获。

14. 发明授权

US5446434A Magnet having pole faces with trapezoidal-shaped shims 失效
标题翻译：磁铁具有带梯形垫片的极面
公开(公告)号：US5446434A
公开(公告)日：1995-08-29
申请号：US280976
申请日：1994-07-27
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 , G01R33/383 , G01R33/3873 , H01F6/00 , G01V3/00
CPC分类号： H01F6/00 , G01R33/383 , G01R33/3873 , G01R33/3806
摘要： A magnet including spaced-apart first and second pole pieces with generally opposing first and second pole faces. The first pole face has an axis extending generally towards the second pole face and has a generally circular shim tray generally coaxially aligned with the axis and attached to the first pole face. The circular shim tray has shims each with a shape of generally a trapezoid when viewed facing the first pole face. The trapezoidal shaped shims may be arranged on the circumferences of imaginary concentric circles on the circular shim trays, with trapezoids on the same circumference having generally the same trapezoidal shape and with trapezoids on different circumferences having generally different trapezoidal shapes, to provide a smoother magnetic field to better reduce 3D (three-dimensional) magnetic field inhomogeneity.
摘要翻译：磁体包括间隔开的第一和第二极片，其具有大致相对的第一和第二极面。第一极面具有大致朝向第二极面延伸的轴线，并且具有大致圆形的垫片托盘，其大致与轴线同轴对准并且附接到第一极面。当朝向第一极面时，圆形垫片每个都具有大致梯形的形状。梯形垫片可以布置在圆形垫片托盘上的虚拟同心圆的圆周上，同一圆周上的梯形具有大致相同的梯形形状，并且梯形在不同的圆周上具有大致不同的梯形形状，以提供更平滑的磁场以更好地减少3D（三维）磁场不均匀性。

15. 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。

16. 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。

17. 发明授权

US5635838A Method for operating a superconductive magnet 失效
标题翻译：操作超导磁体的方法
公开(公告)号：US5635838A
公开(公告)日：1997-06-03
申请号：US597789
申请日：1996-02-07
申请人： Bizhan Dorri , Evangelos T. Laskaris , Howard R. Hart, Jr.
发明人： Bizhan Dorri , Evangelos T. Laskaris , Howard R. Hart, Jr.
IPC分类号： G01R33/3815 , G01R33/3875 , G01R33/20
CPC分类号： G01R33/3815 , G01R33/3875
摘要： A method for operating a superconductive magnet having a superconductor. The magnet is ramped to generally the design current. After that, the magnet is brought to an annealing temperature which is above the operating temperature and below the critical temperature. After that, the magnet is shimmed at a shimming temperature which is at least as cold as the annealing temperature. After that, the magnet is used, at the operating temperature, for a predetermined purpose, such as MRI imaging for medical diagnosis. Preferably, the superconductor has less than twenty-five superconductive filaments.
摘要翻译：一种用于操作具有超导体的超导磁体的方法。磁体通常倾斜到设计电流。之后，使磁体达到高于工作温度并低于临界温度的退火温度。之后，磁体以至少与退火温度一样冷的匀场温度被调光。之后，在工作温度下使用磁铁进行预定的目的，例如用于医学诊断的MRI成像。优选地，超导体具有少于二十五个超导细丝。

18. 发明授权

US5428292A Pancake MRI magnet with modified imaging volume 失效
标题翻译：具有改良成像体积的煎饼MRI磁体
公开(公告)号：US5428292A
公开(公告)日：1995-06-27
申请号：US237516
申请日：1994-04-29
申请人： Bizhan Dorri , Evangelos T. Laskaris
发明人： Bizhan Dorri , Evangelos T. Laskaris
IPC分类号： G01R33/3815 , A61B5/055 , G01R33/38 , G01R33/3875 , G01R33/421 , H01F7/20 , G01V3/00
CPC分类号： G01R33/3875 , G01R33/3806 , G01R33/3815 , G01R33/421
摘要： A pancake magnetic resonance imaging (MRI) magnet having a superconductive coil assembly including a toroidal-shaped coil housing containing a superconductive main coil set and a radially spaced-apart superconductive supplemental coil set. The main coil set includes a first main coil located radially towards the circumferential outside surface which faces away from the bore, and the supplemental coil set includes three radially spaced-apart supplemental coils located radially towards the circumferential outside surface which faces towards the bore. The first main coil and the middle supplemental coil each carry an equal electric current in a first direction while the other two supplemental coils each carry the same electric current in the opposite direction. Such coil arrangement produces an imaging volume longitudinally wider than the longitudinal thickness of the magnet. By adding a sufficient number of additional main coils and by longitudinally offsetting certain coils, the spherical imaging volume may be changed to a longitudinally offset ellipsoidal imaging volume. Such imaging volumes are better designed for breast imaging.
摘要翻译：一种具有超导线圈组件的薄煎饼磁共振成像（MRI）磁体，其包括含有超导主线圈组和径向隔开的超导辅助线圈组的环形线圈壳体。主线圈组包括径向地朝向圆周外表面的第一主线圈，其面向远离孔，并且辅助线圈组包括径向朝向朝向孔的周向外表面径向间隔开的补充线圈。第一主线圈和中间辅助线圈每个在第一方向上承载相等的电流，而另外的两个补充线圈每个在相反方向上承载相同的电流。这种线圈布置产生纵向宽于磁体纵向厚度的成像体积。通过添加足够数量的附加主线圈并且通过纵向偏移某些线圈，球形成像体积可以改变为纵向偏移的椭圆形成像体积。这样的成像体积更好地设计用于乳房成像。

19. 发明授权

US5410287A Open MRI magnet with uniform magnetic field 失效
标题翻译：打开具有均匀磁场的MRI磁体
公开(公告)号：US5410287A
公开(公告)日：1995-04-25
申请号：US223200
申请日：1994-04-05
申请人： Evangelos T. Laskaris , Bizhan Dorri
发明人： Evangelos T. Laskaris , Bizhan Dorri
IPC分类号： G01R33/3875 , A61B5/055 , G01R33/38 , G01R33/3815 , G01R33/421 , H01F7/20 , H01F1/00 , G01V3/00 , H01F5/00
CPC分类号： G01R33/3806 , G01R33/3815 , G01R33/3875 , G01R33/421
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 and a superconductive bucking coil. The bucking coil is spaced radially inward and radially apart from the main coil. The bucking coil carries an electric current equal in amperage, and opposite in direction, to the main coil. The bucking coils overcome the gross magnetic field distortions in the imaging volume of the main coils (created by the open space between the magnet's superconductive coil assemblies) to produce a magnetic field of high uniformity within the imaging volume.
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磁共振成像（MRI）磁体，每个超导线圈组件包括含有超导主线圈和超导电压线圈的环形线圈壳体。抗压线圈径向向内并与主线圈径向分开。抗压线圈以与安装在主线圈上的电流相等的方向传送电流。抵抗线圈克服了主线圈的成像体积（由磁体的超导线圈组件之间的开放空间产生）的总磁场失真，以在成像体积内产生高均匀性的磁场。

20. 发明授权

US5225782A Eddy current free MRI magnet with integrated gradient coils 失效
标题翻译：具有积分梯度线圈的涡流无磁共振磁铁
公开(公告)号：US5225782A
公开(公告)日：1993-07-06
申请号：US759389
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 , G01R33/421
CPC分类号： G01R33/3815 , G01R33/385 , G01R33/421
摘要： This invention relates to refrigerated superconducting eddy current free MR magnets having integrated gradient coils. In particular, the amount of resultant 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 acceptable MR image.
摘要翻译：本发明涉及具有积分梯度线圈的冷冻超导无涡流MR磁体。特别地，由磁体产生的涡流的量大大降低，同时减小了尺寸和重量，并因此降低了产生可接受的MR图像所需的超导磁体的成本。

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