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1. 发明授权

US5345208A Pole face design for a C-shaped superconducting magnet 失效
标题翻译： C形超导磁体的极面设计
公开(公告)号：US5345208A
公开(公告)日：1994-09-06
申请号：US67183
申请日：1993-05-26
申请人： Bizhan Dorri , Evangelos T. Laskaris , Gary Bedrosian , Bu-Xin Xu
发明人： Bizhan Dorri , Evangelos T. Laskaris , Gary Bedrosian , Bu-Xin Xu
IPC分类号： H01F6/00 , G01R33/38 , G01R33/3873 , H01F27/24 , G01V3/00 , G01R33/20
CPC分类号： G01R33/3873 , G01R33/3806
摘要： This invention relates to a pole face design for superconducting magnets of the type that are C-shaped. Such structures of this type, generally, employ pole faces which homogenize the magnet field within the imaging volume.
摘要翻译：本发明涉及一种C型超导磁体的极面设计。这种类型的这种结构通常采用使成像体积内的磁场均匀化的极面。

2. 发明授权

US5539366A Magnet having contoured pole faces for magnetic field homogeneity 失效
标题翻译：具有磁场均匀性的磁极形状的磁体
公开(公告)号：US5539366A
公开(公告)日：1996-07-23
申请号：US281044
申请日：1994-07-27
申请人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle , Bu-Xin Xu
发明人： Bizhan Dorri , Evangelos T. Laskaris , Michele D. Ogle , Bu-Xin Xu
IPC分类号： G01R33/38 , G01R33/3815 , H01F6/00 , H01F3/00 , G01V3/00
CPC分类号： G01R33/3806 , G01R33/3815 , H01F6/00
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 surface region which includes at least two frustoconical surfaces. The frustoconical surfaces are generally coaxially aligned about the axis, and radially-adjacent frustoconical surfaces abut each other. In a second embodiment, points on the surface region located an identical radial distance from the axis are also located a common axial distance along the axis, and a graph of axial distance along the axis versus radial distance from the axis for such points is a curve having a continuous slope with at least two sign reversals. Such contoured pole faces allow for a smoother magnetic field to better reduce axisymmetric 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，并且具有包括至少两个截头圆锥形表面的表面区域。截头圆锥形表面通常围绕轴线同轴对准，并且径向相邻的截头圆锥形表面彼此邻接。在第二实施例中，位于与轴相同的径向距离的表面区域上的点也沿着轴线定位共同的轴向距离，并且沿轴线的轴向距离与该轴线相对于径向距离的曲线图是曲线具有至少两个符号反转的连续斜率。这种轮廓极面允许更平滑的磁场更好地减少轴对称磁场不均匀性。

3. 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。

4. 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。

5. 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。

6. 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。

7. 发明授权

US5416415A Over-shoulder MRI magnet for human brain imaging 失效
标题翻译：用于人脑成像的超肩MRI磁铁
公开(公告)号：US5416415A
公开(公告)日：1995-05-16
申请号：US286364
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 , G01R33/3875 , G01V3/00
CPC分类号： G01R33/3815 , G01R33/3806 , G01R33/3875
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 first longitudinal end of the vacuum enclosure fits over a patient's shoulders with the patient's head at least partially passing through the first bore and extending into the second 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。真空罩的第一纵向端部装配在患者的肩部上，患者的头部至少部分地穿过第一孔并延伸到用于MRI脑成像的第二孔中。

8. 发明授权

US5278502A Refrigerated superconducting MR magnet with integrated cryogenic gradient coils 失效
标题翻译：具有集成低温梯度线圈的冷冻超导MR磁体
公开(公告)号：US5278502A
公开(公告)日：1994-01-11
申请号：US759387
申请日：1991-09-13
申请人： Evangelos T. Laskaris , Bizhan Dorri , Mark E. Vermilyea , Otward M. Mueller
发明人： Evangelos T. Laskaris , Bizhan Dorri , Mark E. Vermilyea , Otward M. Mueller
IPC分类号： G01R33/3815 , G01R33/385 , G01R33/3873 , G01R33/422 , G01V3/00
CPC分类号： G01R33/385 , G01R33/3815 , G01R33/3873 , G01R33/422 , G01R33/3856
摘要： This invention relates to refrigerated superconducting MR magnets having integrated cryogenic 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 acceptable MR image.
摘要翻译：本发明涉及具有集成的低温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。

9. 发明授权

US5574417A Open MRI magnet with homogeneous 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：US5574417A
公开(公告)日：1996-11-12
申请号：US547002
申请日：1995-10-23
申请人： Bizhan Dorri , Evangelos T. Laskaris
发明人： Bizhan Dorri , Evangelos T. Laskaris
IPC分类号： G01R33/38 , G01R33/3815 , H01F7/22 , G01V3/00
CPC分类号： G01R33/3806 , 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. A generally annular-shaped permanent magnet array 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 permanent magnet arrays 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。大致环形的永磁体阵列与每个线圈组件相关联，其大体上与相关联的线圈组件同轴对准并且相对于相关联的线圈组件的超导主线圈径向向内和径向间隔开。永磁体阵列克服了超导主线圈（由磁体超导线圈组件之间的开放空间产生）的成像体积中的总磁场失真，从而在成像体积内产生高均匀性的磁场。

10. 发明授权

US5568102A Closed superconductive magnet with homogeneous 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：US5568102A
公开(公告)日：1996-10-22
申请号：US603520
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 , G01R33/3873 , H01F6/06 , G01V3/00
CPC分类号： G01R33/3815 , 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 annular-shaped permanent magnet arrays is spaced radially inward and apart from the superconductive main coils. The permanent magnet arrays allow the design of a shorter MRI magnet because the permanent magnet arrays 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。一对大致环形的永磁体阵列径向向内并与超导主线圈隔开。永磁体阵列允许设计较短的MRI磁体，因为永久磁体阵列克服了磁体成像体积中的总磁场失真（通过去除一些附加的纵向最外面的超导主线圈而产生，否则在磁体中使用，以使磁体更短）以在成像体积内产生高均匀性的磁场。

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