公开(公告)号：US5690991A

公开(公告)日：1997-11-25

申请号：US576707

申请日：1995-12-21

Applicant: Bu-Xin Xu ,  O'Neil T. McClam ,  Geer Ward

Inventor： Bu-Xin Xu ,  O'Neil T. McClam ,  Geer Ward

IPC: H01R43/02 ,  H01L39/02 ,  B05D1/18 ,  B05D5/12

CPC classification number: H01L39/02 ,  Y10S505/924 ,  Y10S505/925

Abstract: A method of forming a superconducting joint between the Nb.sub.3 Sn layer of a superconducting tape and a superconducting NbTi wire through use of a Pb-Bi bath, joint securing arrangement and mold around the joint.

Abstract translation: 通过使用Pb-Bi浴，在接头周围的接头固定装置和模具在超导带的Nb ​​3 Sn层和超导NbTi线之间形成超导接头的方法。

公开(公告)号：US5394130A

公开(公告)日：1995-02-28

申请号：US1692

申请日：1993-01-07

Applicant: Bu-Xin Xu ,  Raghavan Jayakumar ,  John J. Wollan

Inventor： Bu-Xin Xu ,  Raghavan Jayakumar ,  John J. Wollan

IPC: H01F6/06 ,  H01L39/20 ,  H01F1/00 ,  H01F7/06 ,  H01H47/00

CPC classification number: H01F6/06 ,  H01L39/20 ,  Y10S336/01 ,  Y10S505/879

Abstract: A stable superconducting switch suitable for use in a conduction-cooled superconducting magnet includes a tape wound in a coil with the tape including an Nb.sub.3 Sn conductor sandwiched between stabilizing layers of copper, bronze or brass and wound in layers, with groups of layers separated by a partial layer of electrically conductive material.

Abstract translation: 适合用于传导冷却超导磁体的稳定超导开关包括缠绕在线圈中的带，该带缠绕在包含铜，青铜或黄铜的稳定层之间的Nb3Sn导体，并以层缠绕，层被 部分导电材料层。

公开(公告)号：US07196520B2

公开(公告)日：2007-03-27

申请号：US10904094

申请日：2004-10-22

Applicant: Weijun Shen ,  Minfeng Xu ,  Bu-Xin Xu

Inventor： Weijun Shen ,  Minfeng Xu ,  Bu-Xin Xu

IPC: G01V3/00

CPC classification number: G01R33/3873

Abstract: An apparatus and method for shimming a magnetic field of a magnet in a volume of interest includes a nonmagnetic holder configured with an array of fluid containing pockets; and a solidified ferromagnetic fluid in each pocket of the array of fluid containing pockets, wherein the solidified ferromagnetic fluid is fabricated from a ferromagnetic fluid, a diluting liquid, a hardener, and an accelerator agent. The ferromagnetic fluid includes a carrier liquid, ferromagnetic particles, and a surfactant.

Abstract translation: 用于对感兴趣的体积中的磁体的磁场进​​行匀场的装置和方法包括：非磁性保持器，其配置有包含口袋的流体阵列; 以及在包含凹穴的流体阵列的每个凹槽中的固化铁磁流体，其中固化的铁磁流体由铁磁流体，稀释液体，固化剂和促进剂制成。 铁磁流体包括载液，铁磁颗粒和表面活性剂。

公开(公告)号：US07001479B2

公开(公告)日：2006-02-21

申请号：US10406431

申请日：2003-04-03

Applicant: Ronald Floyd Lochner ,  Weijun Shen ,  Geer Ward ,  Bu-Xin Xu

Inventor： Ronald Floyd Lochner ,  Weijun Shen ,  Geer Ward ,  Bu-Xin Xu

IPC: B32B31/04

CPC classification number: G01R33/383 ,  G01R33/3802 ,  Y10T29/49014 ,  Y10T29/49075 ,  Y10T29/49895 ,  Y10T29/49899 ,  Y10T29/49902 ,  Y10T156/1089

Abstract: A method for bonding a plurality of magnetized blocks together includes providing at least two magnetized blocks, and bonding at least two magnetized blocks together using a door translatable in two orthogonal directions.

Abstract translation: 用于将多个磁化块结合在一起的方法包括提供至少两个磁化块，并且使用可在两个正交方向上平移的门将至少两个磁化块结合在一起。

公开(公告)号：US06859123B2

公开(公告)日：2005-02-22

申请号：US10406531

申请日：2003-04-03

Applicant: Jinsheng Zheng ,  Jinhua Huang ,  Ronald Floyd Lochner ,  Weijun Shen ,  Hideaki Uno ,  Geer Ward ,  Bu-Xin Xu

Inventor： Jinsheng Zheng ,  Jinhua Huang ,  Ronald Floyd Lochner ,  Weijun Shen ,  Hideaki Uno ,  Geer Ward ,  Bu-Xin Xu

IPC: A61B5/055 ,  G01R33/383 ,  H01F7/02 ,  H01F7/00

CPC classification number: H01F7/0278 ,  G01R33/383 ,  Y10T29/49014

Abstract: A method for positioning permanent magnetic blocks includes providing a plurality of magnetized blocks, positioning the magnetized blocks on a yoke in a row by applying a mechanical force at a first end of the row with a first clamping member and at a second end of the row with a second clamping member, and repositioning the blocks by reducing the mechanical force at the first end by moving the first clamping member away from the first end, and moving the second clamping member toward the second end.

Abstract translation: 用于定位永磁块的方法包括提供多个磁化块，通过用第一夹紧构件在该行的第一端处施加机械力并且在该行的第二端处施加机械力将磁化块定位在一个轭上 具有第二夹紧构件，并且通过使第一夹紧构件远离第一端而减小第一端部的机械力，并且使第二夹紧构件向第二端移动，来重新定位块体。

公开(公告)号：US06819108B2

公开(公告)日：2004-11-16

申请号：US10410416

申请日：2003-04-09

Applicant: Jinhua Huang ,  Bu-Xin Xu ,  Bijan Dorri ,  Bruce Amm

Inventor： Jinhua Huang ,  Bu-Xin Xu ,  Bijan Dorri ,  Bruce Amm

IPC: G01V300

CPC classification number: G01R33/3873 ,  G01R33/3875

Abstract: The present invention is directed to a method of shimming a magnet assembly of an MR imaging system such that a desired B0 field strength may be created with minimal inhomogeneities therethrough. With this method, sufficient shimming of the magnet assembly may be achieved without requiring mechanical variations to the magnet assembly after the magnet assembly has been assembled. The invention analyzes variations from the desired B0 field and inhomogeneities at a number of target points along the magnet assembly or B0 field. A comparison is then made at each point to determine a shimming or weighting factor such that the desired overall B0 field strength and targeted field homogeneity is achieved. Active and/or passive shim elements may then be incorporated into the magnet assembly at each target point to achieve the desired overall field strength and minimum overall field homogeneity.

Abstract translation: 本发明涉及一种对MR成像系统的磁体组件进行匀场的方法，使得可以以最小的非均匀性通过其产生所需的B0场强。 利用这种方法，可以在磁体组件组装之后不需要对磁体组件的机械变化来实现磁体组件的足够的垫片。 本发明分析了沿着磁体组件或B0场的多个目标点处的期望的B0场和不均匀性的变化。 然后在每个点进行比较以确定匀场或加权因子，使得实现期望的总体B0场强和目标场均匀性。 然后可以在每个目标点处将主动和/或被动垫片元件并入到磁体组件中，以实现期望的总场强和最小的整体场均匀性。

公开(公告)号：US06181137B2

公开(公告)日：2001-01-30

申请号：US09360712

申请日：1999-07-26

Applicant: Timothy John Havens ,  Xianrui Huang ,  Robert Sethfield Smith ,  Steven Ho-Chong Wong ,  Michele Ogle ,  Bu-Xin Xu ,  Minfeng Xu

Inventor： Timothy John Havens ,  Xianrui Huang ,  Robert Sethfield Smith ,  Steven Ho-Chong Wong ,  Michele Ogle ,  Bu-Xin Xu ,  Minfeng Xu

IPC: G01V300

CPC classification number: G01R33/387

Abstract: A method for shimming a magnetic resonance imaging magnet requiring higher magnetic field homogneity on a small imaging volume and by magnetic field measurements on a larger volume providing small measurement error and practical field strength measurements and utilizing the spherical harmonic coefficients of the measurements.

Abstract translation: 一种用于对在小成像体积上需要较高磁场均匀性的磁共振成像磁体进行匀场的方法以及通过较大体积的磁场测量来提供小的测量误差和实际的场强度测量并利用测量的球谐函数。

公开(公告)号：US5731939A

公开(公告)日：1998-03-24

申请号：US707551

申请日：1996-09-04

Applicant: Dan Arthur Gross ,  Bu-Xin Xu

Inventor： Dan Arthur Gross ,  Bu-Xin Xu

IPC: H01F6/02 ,  H02H7/00 ,  H02H9/00

CPC classification number: H02H7/001 ,  Y02E40/68

Abstract: A quench-protecting superconductive-magnet electrical circuit. An impregnated superconductive-switch wire is coupled to the leads of a cryostable superconductive-coil assemblage having series-coupled coil portions. Series-coupled fan-in resistive heaters are also coupled in parallel with corresponding coil portions and are positioned thermally proximate the superconductive-switch wire. Fan-out resistive heaters are coupled in parallel with corresponding coil portions and are positioned thermally proximate corresponding coil portions. A local quench in one coil portion activates its corresponding fan-in resistive heater which quenches the superconductive-switch wire which activates all of the fan-out resistive heaters which globally quenches all of the coil portions thereby preventing local quench damage.

Abstract translation: 一种淬火保护超导磁体电路。 浸渍的超导开关线耦合到具有串联耦合线圈部分的低温超导线圈组件的引线。 串联耦合的风扇电阻式加热器也与相应的线圈部分并联并且被定位成热接近超导开关线。 扇出电阻加热器与相应的线圈部分并联耦合并且被定位在热对应于相应的线圈部分处。 一个线圈部分中的局部淬火激活其相应的风扇电阻加热器，其淬火超导开关线，其激活所有扇出电阻加热器，其全部淬火所有线圈部分，从而防止局部淬火损坏。

公开(公告)号：US5539367A

公开(公告)日：1996-07-23

申请号：US236060

申请日：1994-05-02

Applicant: Bu-Xin Xu ,  Yannis P. Tsavalas ,  Phillip W. Eckels

Inventor： Bu-Xin Xu ,  Yannis P. Tsavalas ,  Phillip W. Eckels

IPC: A61B5/055 ,  G01R33/3815 ,  G01R33/385 ,  G01R33/421 ,  H01F6/00 ,  H01F6/02 ,  H01F7/00 ,  G01V3/00 ,  H01F1/00 ,  H02H7/00

CPC classification number: G01R33/421 ,  G01R33/3815 ,  G01R33/385 ,  G01R33/4215

Abstract: A magnetic resonance imaging magnet including a superconducting gradient shield positioned around the gradient coil and contiguous to the cryogen vessel, with the gradient shield being selectively placed in superconducting operation to shield the magnet coils and structures from the magnetic fields generated by firing the imaging gradient coil positioned within the bore of the magnetic resonance imaging magnet. A plurality of thermally conductive members are compressed between the cryogen vessel and the gradient shield.

Abstract translation: 一种磁共振成像磁体，其包括位于所述梯度线圈周围并与所述致冷剂容器邻接的超导梯度屏蔽，其中所述梯度屏蔽选择性地被放置在超导操作中，以将所述磁体线圈和结构与由所述成像梯度线圈 位于磁共振成像磁体的孔内。 多个导热构件在冷冻剂容器和梯度屏蔽之间被压缩。

公开(公告)号：US5539366A

公开(公告)日：1996-07-23

申请号：US281044

申请日：1994-07-27

Applicant: Bizhan Dorri ,  Evangelos T. Laskaris ,  Michele D. Ogle ,  Bu-Xin Xu

Inventor： Bizhan Dorri ,  Evangelos T. Laskaris ,  Michele D. Ogle ,  Bu-Xin Xu

IPC: G01R33/38 ,  G01R33/3815 ,  H01F6/00 ,  H01F3/00 ,  G01V3/00

CPC classification number: G01R33/3806 ,  G01R33/3815 ,  H01F6/00

Abstract: 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.

Abstract translation: 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。