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    • 2. 发明专利
    • Magnetic resonance imaging device
    • 磁共振成像装置
    • JP2007061528A
    • 2007-03-15
    • JP2005254621
    • 2005-09-02
    • Hitachi Ltd株式会社日立製作所
    • IMAMURA YUKINOBUNAKAYAMA TAKESHICHIBA TOMOO
    • A61B5/055
    • PROBLEM TO BE SOLVED: To provide a magnetic resonance imaging device which can suppress a magnetostatic magnet from vibration caused by the magnetic field leaked from a gradient magnetic coil.
      SOLUTION: The apparatus comprises a magnetostatic coils 6 and 7, a magnetostatic magnet including magnetic materials 8a and 8b, a gradient magnetic coils 3, 13a and 13b, wherein the coils 6 and 7 generate a magnetostatic field in a space for monitoring a subject; the gradient magnetic coils 3, 13a and 13b generate a gradient magnetic field in the space 9; and the magnetic materials 8a and 8b are molded to be rings or disks, in the peripheries of which a plurality of slits 22 and 24 are formed to extend along the radii, thereby to reduce eddy currents flowing in the magnetic materials caused by the magnetic fields leaked from the gradient magnetic coils, allowing suppression of vibrations effected by electromagnetic forces generated by the eddy currents and the magnetostatic fields.
      COPYRIGHT: (C)2007,JPO&INPIT
    • 解决的问题:提供一种可以抑制静磁磁体从由梯度磁线圈泄漏的磁场引起的振动的磁共振成像装置。 解决方案:该装置包括静磁线圈6和7,包括磁性材料8a和8b的静磁磁体,梯度磁性线圈3,13a和13b,其中线圈6和7在用于监测的空间中产生静磁场 课程; 梯度磁线圈3,13a和13b在空间9中产生梯度磁场; 并且磁性材料8a和8b被模制成环或圆盘,在其周边形成有多个狭缝22和24沿着半径延伸,从而减少由磁场引起的在磁性材料中流动的涡流 从梯度磁线圈泄漏,允许抑制由涡流和静磁场产生的电磁力所产生的振动。 版权所有(C)2007,JPO&INPIT
    • 3. 发明专利
    • Superconductive magnet
    • 超级磁铁
    • JP2008091803A
    • 2008-04-17
    • JP2006273531
    • 2006-10-05
    • Hitachi Ltd株式会社日立製作所
    • NEMOTO TAKEOCHIBA TOMOO
    • H01F6/02H01F6/00H01L39/04
    • PROBLEM TO BE SOLVED: To solve such a problem that when a superconductive magnet is quenched, the arrangement of a liquid storage tank and a heat shield temporarily changes with respect to the arrangement before quenching by the electromagnetic induction action, which results in everlasting contacting of the liquid storage tank and the heat shield, thereby increasing the consumption amount of liquid helium. SOLUTION: The liquid storage tank and the heat shield can be made not to contact with each other by a method of using a number of load supporters. However, too much heat transfer amount from the load supporters increases the consumption amount of the cryogen. Then, a structure is made in which only when the superconductive magnet is quenched, they are temporarily contacted; and when the quenching is finished, the arrangement of the liquid storage tank and the heat shield is returned to the arrangement before the quenching by a restoring force of the load supporters and a contact spring effect of a contact piece installed on the liquid storage tank and a beam installed on the heat shield. COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题为了解决这样的问题,当超导磁体被淬火时,液体储罐和隔热罩的布置相对于通过电磁感应作用的淬火之前的布置暂时改变,这导致 液体储罐与隔热罩的连续接触,从而增加液氦的消耗量。 解决方案:液体储罐和隔热罩可以通过使用多个负载支撑件的方法彼此接触。 然而,来自负载支架的太多传热量增加了冷冻剂的消耗量。 然后,制造仅在超导磁体淬火时它们暂时接触的结构; 并且当淬火完成时,液体储罐和隔热罩的布置通过负载支撑件的恢复力和在液体储罐上安装的接触片的接触弹簧效应而返回到淬火之前的布置,以及 安装在隔热罩上的梁。 版权所有(C)2008,JPO&INPIT
    • 5. 发明专利
    • Superconducting magnet device, and magnetic resonance imaging apparatus
    • 超级磁铁装置和磁共振成像装置
    • JP2008130744A
    • 2008-06-05
    • JP2006312907
    • 2006-11-20
    • Hitachi Ltd株式会社日立製作所
    • ANDO TATSUYAABE MITSUJIYAMAMOTO TSUTOMUCHIBA TOMOO
    • H01F6/04A61B5/055F25B9/00F25B9/14G01R33/3815H01L39/04
    • G01R33/3815G01R33/3804G01R33/3806G01R33/421
    • PROBLEM TO BE SOLVED: To provide a superconducting magnet device and a magnetic resonance imaging apparatus in which a dynamic magnetic field generated as a result of operation of a chiller for reliquefying vaporized refrigerant for cooling a superconducting coil has no impact on imaging. SOLUTION: The superconducting magnet device comprises a container (35) containing refrigerant for cooling a superconducting coil generating a magnetostatic field, a vacuum container (37) for holding the refrigerant container (35) under vacuum state, a radiation shield (36) arranged between the outer circumferential surface of the refrigerant container (35) and the inner circumferential surface of the vacuum container (37). The chiller (20) has a first cold storage member (21) reciprocating between the outer circumferential surface of the refrigerant container (35) and the inner circumferential surface of the radiation shield (36) wherein dynamic magnetic field shielding members (61, 62) of good electrical conductor are arranged around the axis of the reciprocal shaft (P) of the first cold storage member (21), and the reciprocal shaft (P) of the first cold storage member (21) substantially coincides with the direction of the magnetostatic field. COPYRIGHT: (C)2008,JPO&INPIT
    • 解决的问题:提供一种超导磁体装置和磁共振成像装置,其中,作为用于再液化的制冷机的运行而产生的动态磁场用于冷却超导线圈的蒸发制冷剂对成像没有影响。 解决方案:超导磁体装置包括容纳冷却产生静磁场的超导线圈的制冷剂的容器(35),用于将制冷剂容器(35)保持在真空状态的真空容器(37),辐射屏蔽(36) )配置在制冷剂容器(35)的外周面与真空容器(37)的内周面之间。 制冷装置(20)具有在制冷剂容器(35)的外周面与辐射屏蔽(36)的内周面之间往复运动的第一冷藏部件(21),其中动态磁场屏蔽部件(61,62) 的良导体布置在第一冷藏部件(21)的往复轴(P)的轴线的周围,第一冷藏部件(21)的往复轴(P)大致与静磁方向一致 领域。 版权所有(C)2008,JPO&INPIT
    • 7. 发明专利
    • Superconducting magnet device and magnetic resonance imaging apparatus
    • 超导磁体装置和磁共振成像装置
    • JP2007208232A
    • 2007-08-16
    • JP2006190146
    • 2006-07-11
    • Hitachi Engineering & Services Co LtdHitachi Ltd株式会社日立エンジニアリング・アンド・サービス株式会社日立製作所
    • WATANABE HIROYUKIKAWAMURA ATSUSHICHIBA TOMOOYAMAZAKI BISHIYUKUTAKIZAWA TERUHIRO
    • H01F6/00A61B5/055G01R33/3815
    • G01R33/3815G01R33/3806G01R33/421
    • PROBLEM TO BE SOLVED: To provide an MRI device wherein the deformation caused at welding and the deterioration of current-carrying performance of a superconducting coil due to heat are restrained, and further the height in vertical direction and weight are suppressed. SOLUTION: A superconducting magnet device 110 includes two circle-like helium vessels 7 substantially symmetrically, vertically arranged to have a space therebetween. Each of vessels contains a main coil 1 for generating a measuring magnetic field and a shield coil 3 for generating a magnetic field for suppressing leak to the outside of the measuring magnetic field, together with a liquid helium. At a center part of a symmetrical plane between the vessels, a uniform measuring magnetic field is generated. An opposite surface of a surface facing the symmetrical plane of the circle-like helium vessel 7 is made of a thick plate 5 acting as a structural supporting member. A shield coil bobbin 4 containing the shield coil 3 is supported by the thick plate 5. A main coil bobbin 2 housing the main coil 1 is supported by the thick plate 5 and the shield coil bobbin 4. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:提供一种MRI装置,其中,在焊接时引起的变形和由于热引起的超导线圈的载流性能的劣化被抑制,并且进一步抑制了垂直方向和重量的高度。 解决方案:超导磁体装置110包括两个圆形的氦容器7,其基本上对称地垂直地布置成在它们之间具有空间。 每个容器包含用于产生测量磁场的主线圈1和用于产生用于抑制泄漏到测量磁场外部的泄漏的磁场以及液氦的屏蔽线圈3。 在容器之间的对称平面的中心部分,产生均匀的测量磁场。 面向圆形氦容器7的对称平面的表面的相对表面由用作结构支撑构件的厚板5制成。 包含屏蔽线圈3的屏蔽线圈架4由厚板5支撑。容纳主线圈1的主线圈架2由厚板5和屏蔽线圈架4支承。(C) 2007年,日本特许厅和INPIT
    • 8. 发明专利
    • Superconducting magnet device and method of injecting coolant thereinto
    • 超级磁体装置及注射冷却剂的方法
    • JP2007005573A
    • 2007-01-11
    • JP2005184258
    • 2005-06-24
    • Hitachi Ltd株式会社日立製作所
    • CHIBA TOMOOWATANABE HIROYUKIKOGA YASUNORI
    • H01F6/04H01F6/00
    • PROBLEM TO BE SOLVED: To provide a superconducting magnet device capable of reducing heat that penetrates inside a coil vessel, and restraining a cooling medium that is contained inside the coil vessel from evaporating. SOLUTION: A cooling medium injection method, is used for injecting a cooling medium into a coil vessel 21 which holds a built-in superconducting coil 11, has power lead piping 51, and is provided to a superconducting magnet device 81. In the cooling medium injection method, a cooling medium injecting pipe is inserted into the power lead piping 51, the cooling medium is fed into the coil vessel 21 through the cooling medium pipe, and then the cooling medium injection pipe is extracted from the power lead piping 51, after the supplying of the cooling medium to the coil vessel 21 is finished. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:提供能够减少穿过线圈容器内部的热量并限制容纳在线圈容器内部的冷却介质的超导磁体装置的蒸发。 解决方案:冷却介质注入方法用于将冷却介质注入到保持内置超导线圈11的线圈容器21中,具有电力引线配管51,并提供给超导磁体装置81。 冷却介质注入法,冷却介质注入管插入电力引线管51中,冷却介质通过冷却介质管供给到线圈容器21中,然后将冷却介质注入管从电力引导管 在向线圈容器21供给冷却介质之后,如图51所示。 版权所有(C)2007,JPO&INPIT