公开(公告)号：US20060208732A1

公开(公告)日：2006-09-21

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 ,  H01F7/02

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：US06958672B1

公开(公告)日：2005-10-25

申请号：US10710289

申请日：2004-06-30

Applicant: Weijun Shen ,  Bu-Xin Xu

Inventor： Weijun Shen ,  Bu-Xin Xu

IPC: G01R33/383 ,  H01F13/00

CPC classification number: H01F13/003 ,  G01R33/383

Abstract: A system and a method for magnetizing one of a plurality of substantially non-magnetized blocks disposed on a plate of a magnetic assembly used in an MRI device are provided. The system includes first and second arm portions operably coupled together. The system further includes a first electromagnetic coil disposed on a first end of the first arm portion, wherein the first electromagnetic coil is configured to generate a magnetic field that propagates from the first electromagnetic coil through at least one non-magnetized block and the plate and further through the first and second arm portions to magnetize the block.

Abstract translation: 提供一种用于磁化设置在MRI装置中使用的磁性组件的板上的多个基本上非磁化块中的一个的系统和方法。 该系统包括可操作地联接在一起的第一和第二臂部分。 所述系统还包括设置在所述第一臂部分的第一端上的第一电磁线圈，其中所述第一电磁线圈被配置为产生从所述第一电磁线圈传播通过至少一个非磁化块和所述板的磁场，以及 还通过第一和第二臂部分来磁化块。

公开(公告)号：US06664878B1

公开(公告)日：2003-12-16

申请号：US10064565

申请日：2002-07-26

Applicant: William E-Wei Chen ,  Jinhua Huang ,  Ronald Floyd Lochner ,  Weijun Shen ,  Geer Ward ,  Bu-Xin Xu

Inventor： William E-Wei Chen ,  Jinhua Huang ,  Ronald Floyd Lochner ,  Weijun Shen ,  Geer Ward ,  Bu-Xin Xu

IPC: H01F702

CPC classification number: G01R33/3806 ,  G01R33/383

Abstract: Disclosed herein is a method for assembling a magnetic field generator for a magnetic resonance imaging system. The method comprises: establishing an arrangement for a permanent magnet of a magnet assembly comprising a ferromagnetic yoke plate and a permanent magnet, wherein the arrangement includes a portion of a cavity formed from placement of a portion of a plurality of retainers attached at substantially the perimeter of the yoke plate. The method also includes populating the first portion of the cavity with a set of rails attached to the yoke plate and affixing a plurality of gliders to a plurality of magnet blocks and magnetizing the gliders and magnet blocks to form a plurality of block assemblies. Finally, the method includes sliding each block assembly of the plurality of block assemblies along a rail of the set of rails; initiating with an outermost rail and concluding with an innermost, securing each successively filled rail with a retainer.

Abstract translation: 本文公开了一种用于组装用于磁共振成像系统的磁场发生器的方法。 该方法包括：为包括铁磁轭板和永磁体的磁体组件的永磁体建立一种装置，其中该装置包括一部分空腔，该部分通过将大体上周边附接的多个保持器的一部分放置 的轭板。 该方法还包括用连接到轭板的一组轨道填充空腔的第一部分，并将多个滑翔机固定到多个磁体块上，并使滑行器和磁体块磁化以形成多个块组件。 最后，该方法包括沿着该组轨道的轨道滑动多个块组件的每个块组件; 用最外面的导轨起始，并用最内层结束，用固定器固定每个连续填充的轨道。

公开(公告)号：US5291169A

公开(公告)日：1994-03-01

申请号：US970511

申请日：1992-11-02

Applicant: Oluwasegun O. Ige ,  Bu-Xin Xu

Inventor： Oluwasegun O. Ige ,  Bu-Xin Xu

IPC: G01R33/38 ,  G01R33/3875 ,  H01F7/22

CPC classification number: G01R33/3806 ,  G01R33/3875

Abstract: An open architecture Magnetic Resonance Imaging Magnet with a pair of spaced annular superconducting magnet assemblies utilizing a cantilevered main magnet coil and correction magnet coil within each assembly.

Abstract translation: 一种开放式架构磁共振成像磁体，具有一对间隔开的环形超导磁体组件，其利用悬臂式主磁体线圈和每个组件内的校正磁体线圈。

公开(公告)号：US06828891B2

公开(公告)日：2004-12-07

申请号：US10064538

申请日：2002-07-25

Applicant: Peter Jarvis ,  Ronald Floyd Lochner ,  Alex Palkovich ,  Bu-Xin Xu

Inventor： Peter Jarvis ,  Ronald Floyd Lochner ,  Alex Palkovich ,  Bu-Xin Xu

IPC: H01F500

CPC classification number: G01R33/383 ,  Y10T29/49014 ,  Y10T29/4902 ,  Y10T29/49075 ,  Y10T29/49078

Abstract: Disclosed herein is a magnetic field generator and method for assembling the same for a magnetic resonance imaging system, the method comprising: establishing a layout for a permanent magnet of a magnet assembly comprising a pole piece, a ferromagnetic plate yoke and a permanent magnet. The method also includes populating the layout with a plurality of mock-up sticks and block retainers to form a mock layout for the permanent magnet; and installing a magnet block in place of at least one mock-up stick of the plurality of mock-up sticks. Installing the magnet blocks includes pushing the magnet block along a selected slot formed by the displacement of at least one mock-up stick of the plurality of mock-up sticks.

Abstract translation: 本发明公开了一种用于磁共振成像系统的磁场发生器及其组装方法，该方法包括：为包括极片，铁磁板轭铁和永久磁铁的磁体组件的永磁体建立布局。 该方法还包括用多个模型棒和块保持器填充布局以形成永磁体的模拟布局; 以及安装磁块代替多个模型棒中的至少一个模型棒。 安装磁体块包括沿着由多个模型棒中的至少一个模型棒的位移形成的所选狭缝推动磁体块。

公开(公告)号：US06717781B2

公开(公告)日：2004-04-06

申请号：US09682589

申请日：2001-09-25

Applicant: Minfeng Xu ,  Xianrui Huang ,  Bu-Xin Xu ,  Jinhua Huang

Inventor： Minfeng Xu ,  Xianrui Huang ,  Bu-Xin Xu ,  Jinhua Huang

IPC: H02H700

CPC classification number: H01F6/02 ,  H01F6/008 ,  H02H7/001 ,  Y02E40/68

Abstract: A superconducting magnet electrical circuit is provided for quench protection. A superconducting coil assemblage is provided including a plurality of spatially separated main and secondary magnet coil portions. The main magnet coil portions are connected in series to form at least one main coil series circuit. The secondary magnet coil portions are also connected in a series to form at least one secondary coil series circuit. At least one temperature limiting circuit is also provided. The temperature limiting circuit may be a quench heater circuit or a quench resistor circuit. The temperature limiting circuit has a plurality of quench heaters or a plurality of quench resistors connected with the superconducting coil assemblage. A superconductive switch is coupled with the superconducting coil assemblage.

Abstract translation: 提供超导磁体电路用于淬火保护。 提供了包括多个空间分离的主和次级磁体线圈部分的超导线圈组件。 主电磁线圈部分串联连接以形成至少一个主线圈串联电路。 次级电磁线圈部分也被串联连接以形成至少一个次级线圈串联电路。 还提供至少一个温度限制电路。 温度限制电路可以是淬火加热器电路或淬火电阻电路。 温度限制电路具有与超导线圈组合件连接的多个骤冷加热器或多个骤冷电阻器。 超导开关与超导线圈组合连接。

公开(公告)号：US5701075A

公开(公告)日：1997-12-23

申请号：US583186

申请日：1996-01-04

Applicant: Bu-Xin Xu ,  Yannis P. Tsavalas

Inventor： Bu-Xin Xu ,  Yannis P. Tsavalas

IPC: G01R33/3875 ,  G01R33/421 ,  G01R33/38 ,  H01F7/02

CPC classification number: G01R33/3875 ,  G01R33/4215

Abstract: A magnetic resonance imaging superconducting magnet including a cryostat, a gradient coil and superconducting gradient shield positioned around the gradient coil with an active resistive shimming member contiguous to the cryostat vessel; and the gradient shield being selectively cooled to superconducting operation after the magnetic shimming fields generated by the shimming member for field homogeneity within the bore of the magnetic resonance imaging magnet are induced onto, and maintained by, the superconducting gradient shield and operation of the resistive shimming member discontinued.

Abstract translation: 一种磁共振成像超导磁体，包括低温恒温器，梯度线圈和超导梯度屏蔽件，其围绕所述梯度线圈定位，所述梯度线圈具有与所述低温恒温器容器相邻的主动阻抗匀场件; 并且在由磁共振成像磁体的孔内的用于场均匀性的匀场件产生的磁性匀场之间被引入超导梯度屏蔽和由超导梯度屏蔽和电阻匀影的操作之后，梯度屏蔽被选择性地冷却到超导操作 成员停产。

公开(公告)号：US5668516A

公开(公告)日：1997-09-16

申请号：US581100

申请日：1995-12-29

Applicant: Bu-Xin Xu ,  Ronald F. Lochner

Inventor： Bu-Xin Xu ,  Ronald F. Lochner

IPC: A61B5/055 ,  G01R33/3815 ,  G01R33/421 ,  H01F6/00 ,  H01H1/00

CPC classification number: G01R33/3815 ,  G01R33/421 ,  H01F6/00

Abstract: An improved actively shielded superconducting magnet in which the main and bucking coils are directly wound onto respective coil support structures made of glass fiber-reinforced epoxy. The main and bucking coil cartridges are held in a fixed concentric relationship via a pair of flanges located at opposite ends of a helium vessel. During manufacture of the main and bucking coil cartridges, the outer diameters of the respective coil support structures are machined with high precision. Also, the diameters of two concentric grooves are precisely machined on the inner surface of each helium vessel end flange to match the outer diameters of the main and bucking coil support structures, so that at room temperature the main and bucking coil cartridges can slide smoothly into these grooves. The helium vessel is made of aluminum alloy and has a coefficient of thermal expansion which is greater than that of the fiber-reinforced epoxy coil support structures. When the helium vessel is filled with liquid helium, the helium vessel end flanges hold the main and bucking coil cartridges tightly with predetermined amount of interference due to differential contraction of the aluminum alloy and the fiber-reinforced epoxy materials. This provides mechanical support to the main and bucking coil cartridges and ensures their concentricity. The relative axial positions of the main and bucking coil cartridges are fixed using the same working principle.

Abstract translation: 一种改进的主动屏蔽超导磁体，其中主和降压线圈直接缠绕在由玻璃纤维增​​强环氧树脂制成的相应的线圈支撑结构上。 通过位于氦气容器相对端的一对法兰将主弹簧和降压线圈筒保持在一个固定的同心关系。 在制造主和降压线圈筒的过程中，相应的线圈支撑结构的外径被高精度地加工。 此外，两个同心槽的直径在每个氦容器端部凸缘的内表面上精确加工，以匹配主和弯曲线圈支撑结构的外径，使得在室温下，主和降压线圈筒可平滑滑动 这些凹槽。 氦气容器由铝合金制成，其热膨胀系数大于纤维增强环氧树脂线圈支撑结构的热膨胀系数。 当氦气容器充满液氦时，由于铝合金和纤维增强环氧树脂材料的不同收缩，氦容器端部凸缘以预定量的干涉紧紧地保持主弹簧和降压线圈筒。 这为主要和屈曲线圈盒提供机械支撑，并确保其同心度。 使用相同的工作原理固定主弹簧和降压线圈筒的相对轴向位置。

公开(公告)号：US5345208A

公开(公告)日：1994-09-06

申请号：US67183

申请日：1993-05-26

Applicant: Bizhan Dorri ,  Evangelos T. Laskaris ,  Gary Bedrosian ,  Bu-Xin Xu

Inventor： Bizhan Dorri ,  Evangelos T. Laskaris ,  Gary Bedrosian ,  Bu-Xin Xu

IPC: H01F6/00 ,  G01R33/38 ,  G01R33/3873 ,  H01F27/24 ,  G01V3/00 ,  G01R33/20

CPC classification number: G01R33/3873 ,  G01R33/3806

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US5140266A

公开(公告)日：1992-08-18

申请号：US710595

申请日：1991-06-05

Applicant: Bizhan Dorri ,  Bu-Xin Xu

Inventor： Bizhan Dorri ,  Bu-Xin Xu

IPC: G01N27/72 ,  G01R31/00 ,  G01R31/06 ,  G01R33/12

CPC classification number: G01R33/1238 ,  G01R31/06 ,  Y10S505/726

Abstract: An apparatus and method is disclosed for evaluating the superconducting quality of superconducting materials. The materials are wound on a bifilar spool and tested in a cryogenic atmosphere to determine when the material quenches. During the testing procedure, the electro-magnetic field, current and temperature imposed on the material are varied and the test results are compared with known results to determine if the material is superconductive. In this way, large samples can be tested in a non-destructive manner.