公开(公告)号：US20180120392A1

公开(公告)日：2018-05-03

申请号：US15572849

申请日：2016-04-28

Applicant: General Electric Company

Inventor： Evangelos Trifon Laskaris ,  William E-Wei Chen ,  Longzhi Jiang ,  Tao Zhang ,  Haixia Xi ,  Jun Li

IPC: G01R33/38 ,  G01R33/3815 ,  H01F6/04

CPC classification number: G01R33/3804 ,  F25B2400/17 ,  G01R33/3815 ,  H01F6/04 ,  H02K55/00 ,  Y02E40/62

Abstract: A superconducting magnet cooling system is disclosed. The superconducting magnet cooling system includes a superconducting magnet; a liquid cryogen vessel for cooling the superconducting magnet; a heat exchanger device in fluid communication with the liquid cryogen vessel; a cryorefrigerator for heat exchange with the heat exchanger device; and a flexible connection device having high thermal conductivity and thermally connecting the cryorefrigerator and the heat exchanger device to provide vibration isolation of the cryorefrigerator from the heat exchange device.

公开(公告)号：US20160252598A1

公开(公告)日：2016-09-01

申请号：US14962345

申请日：2015-12-08

Applicant: General Electric Company

Inventor： Weijun Shen ,  Timothy John Havens ,  Longzhi Jiang ,  Saikat Saha ,  Benjamin Jacob Gronemeyer ,  Venkata Kishore Mogatadakala

IPC: G01R33/565 ,  H01F6/04 ,  G01R33/3875 ,  H01F6/06 ,  G01R33/38 ,  G01R33/3815

CPC classification number: G01R33/56518 ,  G01R33/34023 ,  G01R33/3804 ,  G01R33/3815 ,  G01R33/3875 ,  H01F6/04 ,  H01F6/06 ,  Y10T29/49014

Abstract: A system and method for magnetic field distortion compensation includes a cryostat for a magnetic resonance imaging (MRI) system. The cryostat includes a vacuum casing having a vacuum therein. A cryogen vessel is disposed within the casing, the vessel having a coolant therein. A thermal shield is disposed between the vacuum casing and the cryogen vessel. An eddy current compensation assembly is disposed within the casing. The eddy current compensation assembly includes a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system.

公开(公告)号：US20150168517A1

公开(公告)日：2015-06-18

申请号：US14107216

申请日：2013-12-16

Applicant: General Electric Company

Inventor： Weijun Shen ,  Timothy John Havens ,  Longzhi Jiang ,  Zhenyu Zhang ,  Venkata Kishore Mogatadakala

IPC: G01R33/3815 ,  G01R33/385 ,  G01R33/30 ,  H01F6/06 ,  G01R33/54

CPC classification number: G01R33/3815 ,  G01R33/307 ,  G01R33/385 ,  G01R33/546 ,  H01F6/005 ,  H01F6/06

Abstract: A system for energizing a main coil of superconducting magnet in a magnetic resonance imaging (MRI) system includes a cryostat comprising a housing. A first coil is positioned within the housing of the cryostat. Alternatively, the first coil may be positioned external to the housing of the cryostat. A second coil is coupled to the first coil and positioned external to the housing of the cryostat. The second coil is configured to inductively couple to the main coil. A controller is coupled to the first coil and the second coil and is configured to control the first coil and the second coil to induce current in the main coil.

Abstract translation: 在磁共振成像（MRI）系统中用于激励超导磁体的主线圈的系统包括包括壳体的低温恒温器。 第一线圈定位在低温恒温器的壳体内。 或者，第一线圈可以位于低温恒温器壳体的外部。 第二线圈耦合到第一线圈并且定位在低温恒温器壳体的外部。 第二线圈被配置成感应耦合到主线圈。 控制器耦合到第一线圈和第二线圈，并且被配置为控制第一线圈和第二线圈以感应主线圈中的电流。

公开(公告)号：US20130157865A1

公开(公告)日：2013-06-20

申请号：US13726278

申请日：2012-12-24

Applicant: General Electric Company

Inventor： Weijun Shen ,  Timothy John Havens ,  Longzhi Jiang ,  Saikat Saha ,  Benjamin Jacob Gronemeyer ,  Venkata Kishore Mogatadakala

IPC: G01R33/3875 ,  G01R33/34

CPC classification number: G01R33/56518 ,  G01R33/34023 ,  G01R33/3804 ,  G01R33/3815 ,  G01R33/3875 ,  H01F6/04 ,  H01F6/06 ,  Y10T29/49014

Abstract: A system and method for magnetic field distortion compensation includes a cryostat for a magnetic resonance imaging (MRI) system. The cryostat includes a vacuum casing having a vacuum therein. A cryogen vessel is disposed within the casing, the vessel having a coolant therein. A thermal shield is disposed between the vacuum casing and the cryogen vessel. An eddy current compensation assembly is disposed within the casing. The eddy current compensation assembly includes a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system.

Abstract translation: 用于磁场失真补偿的系统和方法包括用于磁共振成像（MRI）系统的低温恒温器。 低温恒温器包括其中具有真空的真空壳体。 冷冻剂容器设置在壳体内，容器内具有冷却剂。 在真空壳体和冷冻剂容器之间设置热屏蔽。 涡流补偿组件设置在壳体内。 涡流补偿组件包括形成在真空壳体，冷冻剂容器和热屏蔽中的一个上的多个导电回路，并被构造成减轻MRI系统中振动引起的涡流。

公开(公告)号：US09874618B2

公开(公告)日：2018-01-23

申请号：US14582508

申请日：2014-12-24

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Yuri Lvovsky ,  Longzhi Jiang ,  Mark Derakhshan ,  Edwin Legall

IPC: G01R33/3815 ,  G01R33/28 ,  G01R33/3875 ,  G01R33/54

CPC classification number: G01R33/3815 ,  G01R33/288 ,  G01R33/3875 ,  G01R33/543

Abstract: A control system for a superconducting magnet includes an electrically conductive lead having a first end electrically coupled to the superconducting magnet, at least one of a main power supply, a shimming power supply and a discharge module electrically coupled to a second end of the lead, and a controller in communication with the at least one of the main power supply, the shimming power supply and the discharge module. The controller is configured to monitor at least one magnet parameter value indicative of a state of the superconducting magnet and to automatically control operation of the at least one of the main power supply, the shimming power supply and the discharge module when the magnet parameter value crosses a predetermined threshold value prior to a quench.

公开(公告)号：US09322892B2

公开(公告)日：2016-04-26

申请号：US13726278

申请日：2012-12-24

Applicant: General Electric Company

Inventor： Weijun Shen ,  Timothy John Havens ,  Longzhi Jiang ,  Saikat Saha ,  Benjamin Jacob Gronemeyer ,  Venkata Kishore Mogatadakala

IPC: G01V3/00 ,  G01R33/3875 ,  G01R33/34 ,  G01R33/565 ,  G01R33/38 ,  G01R33/3815

CPC classification number: G01R33/56518 ,  G01R33/34023 ,  G01R33/3804 ,  G01R33/3815 ,  G01R33/3875 ,  H01F6/04 ,  H01F6/06 ,  Y10T29/49014

Abstract: A system and method for magnetic field distortion compensation includes a cryostat for a magnetic resonance imaging (MRI) system. The cryostat includes a vacuum casing having a vacuum therein. A cryogen vessel is disposed within the casing, the vessel having a coolant therein. A thermal shield is disposed between the vacuum casing and the cryogen vessel. An eddy current compensation assembly is disposed within the casing. The eddy current compensation assembly includes a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system.

Abstract translation: 用于磁场失真补偿的系统和方法包括用于磁共振成像（MRI）系统的低温恒温器。 低温恒温器包括其中具有真空的真空壳体。 冷冻剂容器设置在壳体内，容器内具有冷却剂。 在真空壳体和冷冻剂容器之间设置热屏蔽。 涡流补偿组件设置在壳体内。 涡流补偿组件包括形成在真空壳体，冷冻剂容器和热屏蔽中的一个上的多个导电回路，并被构造成减轻MRI系统中振动引起的涡流。

公开(公告)号：US09274188B2

公开(公告)日：2016-03-01

申请号：US13690392

申请日：2012-11-30

Applicant: General Electric Company

Inventor： Weijun Shen ,  Timothy J. Havens ,  Longzhi Jiang ,  Tesfaye K. Kidane

IPC: G01V3/00 ,  G01R33/34 ,  G01R33/387 ,  G01R33/3815 ,  G01R33/3875

CPC classification number: G01R33/34023 ,  G01R33/3815 ,  G01R33/387 ,  G01R33/3875

Abstract: A magnet apparatus for a magnetic resonance imaging system, the magnet apparatus includes a cylindrical vacuum vessel, a closed loop cooling system disposed within the vacuum vessel and a cylindrical thermal shield disposed between the vacuum vessel and the closed loop cooling system. A set of passive compensation coils are disposed within the vacuum vessel and used to compensate for magnetic field distortion caused by mechanical vibrations within the magnet apparatus.

Abstract translation: 一种用于磁共振成像系统的磁体装置，磁体装置包括圆柱形真空容器，设置在真空容器内的闭环冷却系统和设置在真空容器和闭环冷却系统之间的圆柱形热屏蔽。 一组无源补偿线圈设置在真空容器内，用于补偿由磁体装置内的机械振动引起的磁场畸变。