WO2018166387A1 - 自屏蔽式磁共振装置 - Google Patents

自屏蔽式磁共振装置 Download PDF

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Publication number
WO2018166387A1
WO2018166387A1 PCT/CN2018/078303 CN2018078303W WO2018166387A1 WO 2018166387 A1 WO2018166387 A1 WO 2018166387A1 CN 2018078303 W CN2018078303 W CN 2018078303W WO 2018166387 A1 WO2018166387 A1 WO 2018166387A1
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WO
WIPO (PCT)
Prior art keywords
shielding
hole
opening
magnet
magnetic resonance
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PCT/CN2018/078303
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English (en)
French (fr)
Inventor
程永辉
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深圳市金石医疗科技有限公司
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Publication of WO2018166387A1 publication Critical patent/WO2018166387A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/0015—Gaskets or seals
    • H05K9/0016—Gaskets or seals having a spring contact

Definitions

  • the present invention relates to the field of magnetic resonance imaging, and more particularly to self-shielding magnetic resonance devices.
  • shield in this document refers to "radio frequency shielding".
  • the present invention proposes a novel self-shielding magnetic resonance apparatus.
  • the technical solution provided by the present invention to solve the above technical problems is to provide a self-shielding magnetic resonance device comprising a magnet, a front shielding device and a rear shielding device, the magnet comprising opposite first and second ends,
  • the front shielding device is disposed at the first end
  • the rear shielding device is disposed at the second end
  • the front shielding device and the rear shielding device each include a waveguide channel.
  • the first end of the magnet is provided with a first through hole, and the first end extends outward along a circumference of the first through hole to form a flange, the flange and the front shielding device A flexible shielding material is formed between the flexible shielding material to achieve radio frequency shielding of the first end.
  • the front shielding device comprises a support frame, a rotating component and a opening and closing assembly
  • the support frame is fixed to the first end of the magnet
  • the opening and closing assembly is rotatably connected to the support frame by the rotating component .
  • the support frame is provided with a second through hole corresponding to the first through hole, and the second through hole includes a first portion and a second portion having unequal inner diameters, such that the first portion and the second portion are between A stepped configuration is formed, and the gradient difference of the first portion and the second portion is equal to the thickness of the flange.
  • the support frame is provided with a circumferential groove around the second through hole at one end of the magnet.
  • the support frame is further disposed with a plurality of first grooves away from one end of the magnet, and the two ends of the first groove respectively communicate with the second through hole away from one end of the magnet and the outside.
  • the opening and closing assembly comprises an opening and closing body, the opening and closing body is provided with a second groove, and the second groove is disposed opposite to the first groove, when the opening and closing assembly is covered
  • the first groove and the second groove form a waveguide channel.
  • the opening and closing assembly comprises an opening and closing body, the opening and closing body comprises a third through hole, the third through hole is provided with a transparent member at one end of the magnet, and the transparent member is to be the third
  • the through hole is sealed, and one or two or more shielding layers are embedded in the transparent member to achieve a good shielding effect.
  • the transparent member has a conductive layer extending from the edge thereof, and the conductive layer is used to implement the shielding layer. Electrical connection to the opening and closing body.
  • the opening and closing body further includes a shielding assembly disposed on a side of the opening and closing body adjacent to the magnet, the shielding assembly includes a plurality of shielding members, and the plurality of shielding members are disposed around the third through hole.
  • the shielding member is an elastic shielding member, and the shielding assembly is embedded in the circumferential groove when the opening and closing assembly is covered by the supporting frame.
  • the second end of the magnet is provided with a plurality of cable outlet holes
  • the rear shielding device comprises a shielding frame and a plurality of shielding tubes, wherein the shielding frame is provided with a plurality of cable outlet holes, a set of air inlets, and a shielding hole
  • the air outlet and the transparent member are assembled, and the shielding tube is inserted into the cable lead-out hole of the second end of the magnet and the cable lead-out hole of the shielding frame, and the shielding tube is inserted into the second end of the magnet and the cable lead-out hole of the shielding frame
  • the inner end is provided with a conductive layer and/or a shielding layer to realize electrical connection between the shielding tube and the cable lead-out hole, and the air inlet and the air outlet are composed of a plurality of waveguide channels.
  • the self-shielding magnetic resonance device adopts a flexible shielding material to form a flexible shielding layer, and an elastic shielding member and a circumferential groove groove to realize the circumference by providing a front shielding device and a rear shielding device at both ends of the magnet.
  • the transparent member comprises a shielding layer for axial shielding.
  • a waveguide channel is formed in both the front shielding device and the rear shielding device, and the magnetic shielding device is completed together with the shielding layer of the flexible shielding layer, the elastic shielding member and the transparent member.
  • FIG. 1 is a schematic perspective view of a self-shielded magnetic resonance apparatus of the present invention
  • FIG. 2 is a schematic view showing still another perspective structure of the self-shielding magnetic resonance apparatus of the present invention.
  • FIG. 3 is a partial cross-sectional view showing the self-shielded magnetic resonance apparatus of the present invention.
  • Figure 4 is a partial enlarged view of a portion A of Figure 3;
  • FIG. 5 is a schematic structural view of a support frame of a self-shielded magnetic resonance apparatus according to the present invention.
  • FIG. 6 is a schematic structural view of a opening and closing assembly of a self-shielding magnetic resonance device according to the present invention.
  • FIG. 7 is a schematic cross-sectional view showing the opening and closing assembly of the self-shielding magnetic resonance device of the present invention covered on a support frame;
  • Figure 8 is a partial enlarged view of a portion B of Figure 7;
  • Figure 9 is a partial enlarged view of a portion C of Figure 7;
  • FIG. 10 is a schematic structural view of a rotating assembly of the self-shielded magnetic resonance device of the present invention.
  • FIG. 11 is a schematic structural view of a rear shielding device of a self-shielded magnetic resonance device according to the present invention.
  • FIG. 12 is a partial cross-sectional structural view of a rear shielding device of the self-shielded magnetic resonance device of the present invention.
  • first, second, and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the present invention provides a self-shielding magnetic resonance apparatus 100 including a magnet 10, a front shield 20 and a rear shield 30, the magnet 10 including a first end 11 and a second end 13 disposed opposite each other.
  • the front shielding device 20 is disposed at the first end 11, the first end 11 is disposed near the scanning bed, the rear shielding device 30 is disposed at the second end 13, and the second end 13 is used for connecting the cable.
  • the shielding device 30 is sealed.
  • the first end 11 of the magnet 10 is provided with a first through hole 15 , and the first end 11 extends outward along the circumference of the first through hole 15 to form a flange 17 .
  • the flexible shielding material is filled between the front shielding devices 20 to form a flexible shielding layer 19 to achieve shielding of the first end 11.
  • the flange 17 and/or the front shielding device 20 may be provided with an annular channel at the junction thereof, and the annular channel is filled with a flexible shielding material.
  • the front shielding device 20 includes a support frame 21 , a rotating component 23 , and a opening and closing assembly 25 .
  • the support frame 21 is fixed to the first end 11 of the magnet 10 , and the opening and closing assembly 25 passes
  • the rotating assembly 23 is rotatably coupled to the support frame 21.
  • the support frame 21 is provided with a second through hole 211 corresponding to the first through hole 15
  • the second through hole 211 includes a first portion 2111 and a second portion 2113 having unequal inner diameters, such that the first portion A stepped configuration is formed between the 2111 and the second portion 2113, and the gradient difference of the first portion 2111 and the second portion 2113 is equal to the thickness of the flange 17.
  • the flange 17 is received in the first portion 2111 and abuts against the second portion 2113, and a flexible shielding material is filled between the inner wall of the first portion 2111 and the flange 17, the second portion 2113
  • the inner diameter is equal to the inner diameter of the first through hole 15.
  • the support frame 21 is disposed away from the end of the magnet 10 around the second through hole 211 and has a circumferential groove 213 for cooperating with corresponding components on the opening and closing assembly 25 .
  • the two through holes 211 are circumferentially formed with a shield, and one side of the support frame 21 extends outward to form two adapter posts 215.
  • the adapter post 215 is provided with a rotating hole, and the rotating hole is a blind hole, and the rotating component Part 23 extends into the through hole.
  • a side of the support frame 21 opposite to the adapter post 215 is provided with a locking cavity 217, and the opening and closing assembly 25 is locked by the locking cavity 217 when it is covered with the support frame 21 .
  • the locking cavity 217 is disposed outside the circumferential groove 213 and near the edge of the support frame 21 .
  • the locking cavity 217 includes a locking cavity and a locking hole 2171.
  • the locking cavity is an inner cavity of the support frame, and communicates with the outside through the locking hole 2171.
  • the locking hole 2171 is substantially elongated. The cross shape.
  • a plurality of first recesses 219 are disposed at one end of the support frame 21 away from the magnet 10.
  • the two ends of the first recess 219 respectively communicate with the end of the second through hole 211 away from the magnet 10 and the outside (air).
  • the circumferential groove 213 communicates with the adjacent first groove 219 across the first groove 219, and the depth of the first groove 219 is smaller than the depth of the circumferential groove 213.
  • the opening and closing assembly 25 includes an opening and closing body 251 , a knob lock 253 , and a pivoting shaft 255 .
  • the knob lock 253 and the pivoting shaft 255 are both supported by the opening and closing body.
  • the pivoting shaft 255 is disposed on a side of the opening and closing body 251, corresponding to the adapter post 215, and the distance between the two of the adapter posts 215 is substantially equal to the pivoting axis 255
  • the knob lock 253 is disposed on a side of the opening and closing body 251 opposite to the pivot shaft 255.
  • the pivoting shaft 255 is provided with a rotating hole, and the rotating component 23 extends into the rotating hole of the pivoting shaft 255 and the rotating hole of the adapter column 215.
  • the rotating hole of the pivoting shaft 255 can be penetrated.
  • the through hole of the pivoting shaft 255 in the longitudinal direction may also be a blind hole disposed at two ends of the pivoting shaft 255. It can be understood that when the rotating hole of the pivoting shaft 255 is a through hole, the rotating hole When only one is set as a blind hole, one rotation hole is arranged at each end of the pivot shaft.
  • the opening and closing body 251 includes a third through hole 2511.
  • the third through hole 2511 is disposed at a distal end of the magnet 10 and is provided with a transparent member 2513.
  • the transparent member 2513 seals the third through hole 2511.
  • the transparent member 2513 further has a radio frequency shielding function.
  • the transparent member 2513 includes one layer, two layers or a plurality of shielding layers, and the shielding layer is embedded in the transparent member 2513 to achieve a good shielding effect.
  • a conductive layer extends from an edge of the transparent member 2513, and the conductive layer realizes electrical connection between the shielding layer and the opening and closing body 251.
  • the opening and closing body 251 further includes a shielding assembly 2515 disposed on a side of the opening and closing body 251 adjacent to the magnet 10 and disposed around the third through hole 2511.
  • the shielding assembly 2515 includes A plurality of shielding members are disposed around the third through hole 2511 to form a shielding ring surrounding the third through hole, and the shielding assembly 2515 is matched with the circumferential groove 213.
  • the shielding member is an elastic shielding member.
  • the opening and closing body 251 is further provided with a plurality of second grooves 2517, and the second grooves 2517 are disposed opposite to the first grooves 219.
  • the first groove 219 and the second groove 2517 together form a plurality of waveguide channels.
  • the RF signal passes through the waveguide channel, the RF signal is continuously attenuated as it penetrates into the waveguide channel, and finally decays to be used for the magnetic resonance device. A weaker signal without interference, thereby achieving RF shielding.
  • the second groove 2517 communicates with the third through hole and the outside.
  • the knob lock 253 is a rotary switch, and includes a lock button (not shown) and a knob (not labeled).
  • the lock button has a narrow cross shape corresponding to the lock hole. When the switch needs to be closed, the knob is pressed. Rotating at an angle causes the lock to enter the lock cavity and is engaged, completing the closing process, and the opening process is reversed.
  • the rotating component 23 includes a rotating shaft 231, and the outer side of the rotating shaft 231 is coated with a damping grease, so that the rotating shaft 231 has a rotation when the pivoting shaft 255 rotates in the rotating hole of the adapter post 215.
  • the resistance is such that the opening and closing assembly 25 can be opened and closed at any angle with respect to the support frame 21.
  • the rotating hole of the pivoting shaft 255 is a through hole
  • the rotating shaft 231 passes through the rotating hole of the pivoting shaft, and the two ends respectively extend into the rotating holes of the adapter column 215.
  • both ends of the rotating shaft 231 are respectively fixed to the adapter column 215, and when the opening and closing assembly 25 is opened and closed, the opening and closing assembly 25 is rotated relative to the rotating shaft 231.
  • the support frame 21, the rotating assembly 23 and the opening and closing body 251 are made of a non-magnetic or nearly non-magnetic material that satisfies the shielding requirements.
  • the front shielding device 20 realizes the shielding of the first through hole 15 in the circumferential direction by the circumferential groove 213 and the shielding assembly 2515 disposed around the third through hole 2511, and the shielding is provided through the transparent member 2513.
  • the layer is shielded in the axial direction.
  • a plurality of the waveguides formed by the first recess 219 and the plurality of the second recesses 2517 also achieve radio frequency shielding.
  • the second end 13 of the magnet 10 is provided with a plurality of cable take-out holes, and the rear shielding device 30 includes a shielding frame 31 and a plurality of shielding tubes, and the shielding frame 31 and the magnet 10 .
  • the fixing of the second end 13 is similar to the fixing of the support frame 21 and the first end 11 of the magnet 10.
  • the second end 13 of the magnet 10 is provided with a fourth through hole and is disposed around the fourth through hole.
  • the second flange is also provided with a flexible shielding material between the shielding frame and the second flange.
  • the shielding frame 31 is provided with a plurality of cable outlet holes 311, a plurality of air inlets 313, a plurality of air outlets 315 and a transparent member, and the plurality of shielding tubes are inserted into the cable outlet holes of the second end of the magnet and the shielding frame.
  • the shielding tube is inserted into the second end of the magnet and the cable receiving hole of the shielding frame is provided with a conductive layer or a shielding layer to realize electrical connection between the shielding tube and the cable lead-out hole.
  • the tuyere 313 and the air outlet 315 are formed by a plurality of waveguide channels.
  • the transparent member is the same as the transparent member of the front shielding device 20, and is a transparent member in which a shielding layer is embedded.
  • the shielding tube extends into the cable lead-out hole to lead the cable of the self-shielding magnetic resonance device 100, and the cable is received in the shielding tube.
  • the shielding frame 31 and the shielding tube are made of a non-magnetic or nearly non-magnetic material that meets the shielding requirements.
  • the animal to be scanned is stably placed on the scanning bed and is anesthetized, and the monitoring of the anesthesia tube, the oxygen tube and the vital signs is required.
  • Device It is assumed here that the opening and closing assembly 25 is closed to the initial state, and the operator will operate as follows:
  • the knob lock 253 is unlocked, the opening and closing assembly 25 is opened, and the opening and closing assembly 25 is stabilized in a suitable position;
  • the scanning bed is fed into the appropriate position inside the magnet 10 through the second through hole 211 of the support frame 21;
  • an anesthesia tube, an oxygen tube, and the like are placed in the first recess 219 of the support frame 21;
  • the opening and closing assembly 25 is closed and the knob lock 253 is locked.
  • the elastic shield on the opening and closing assembly 25 is in close contact with the inner wall of the circumferential groove 213 of the support frame 21; the second groove 2517 on the opening and closing assembly 25 and the first groove 219 on the support frame 21 are combined
  • the narrow channel forms a waveguide that further causes the magnet 10 to be shielded.
  • the relevant device can be activated to scan the animals to be scanned. Throughout the scanning process, the person concerned can observe the inside of the magnet 10 through the transparent member.
  • the self-shielding magnetic resonance device 100 adopts a flexible shielding material to form a flexible shielding layer, an elastic shielding member and a circumferential groove by providing a front shielding device 20 and a rear shielding device 30 at both ends of the magnet. 213 cooperates to realize circumferential shielding, the transparent member includes a shielding layer to achieve axial shielding, and further, the front shielding device 20 and the rear shielding device 30 are formed with a waveguide channel, which is common with the shielding layer of the flexible shielding layer, the elastic shielding member and the transparent member. The radio frequency shielding of the magnetic resonance apparatus is completed.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

本发明涉及磁共振成像领域，特别涉及自屏蔽式磁共振装置，包括磁体、前屏蔽装置和后屏蔽装置，所述磁体包括相对设置的第一端和第二端，所述前屏蔽装置设置于第一端，所述后屏蔽装置设置于第二端，所述前屏蔽装置及所述后屏蔽装置均包含波导通道。所述自屏蔽式磁共振装置通过在磁体的两端设置前屏蔽装置和后屏蔽装置，并在前屏蔽装置和后屏蔽装置均包含波导通道，共同形成了完整的射频屏蔽系统。

Description

自屏蔽式磁共振装置 【技术领域】
本发明涉及磁共振成像领域，特别涉及自屏蔽式磁共振装置。
【背景技术】
在磁共振成像领域，外界干扰信号会对扫描成像产生不利的影响。因此，为了屏蔽外界干扰信号，需要额外建立一个屏蔽室。此类屏蔽室建造过程漫长、占地面积庞大且造价昂贵，大大增加了设备的使用成本，如无特殊说明，本文中的“屏蔽”特指“射频屏蔽”。
【发明内容】
为了克服上述问题，本发明提出一种新型的自屏蔽式磁共振装置。
本发明解决上述技术问题提供的一种技术方案是：提供一种自屏蔽式磁共振装置，包括磁体、前屏蔽装置和后屏蔽装置，所述磁体包括相对设置的第一端和第二端，所述前屏蔽装置设置于第一端，所述后屏蔽装置设置于第二端，所述前屏蔽装置及所述后屏蔽装置均包含波导通道。
优选地，所述磁体的第一端设置有一第一通孔，且所述第一端沿所述第一通孔的周缘向外延伸形成一凸缘，所述凸缘与所述前屏蔽装置之间填充有柔性屏蔽材料形成有柔性屏蔽层以实现第一端的射频屏蔽。
优选地，所述前屏蔽装置包括支撑框、旋转组件及开合组件，所述支撑框固定于所述磁体的第一端，所述开合组件通过所述旋转组件转动连接于所述支撑框。
优选地，所述支撑框对应所述第一通孔设置有第二通孔，所述第二通孔包括内径不等的第一部分和第二部分，使得所述第一部分和第二部分之间形成阶梯状构造，且第一部分和第二部分的梯度差等于所述凸缘的厚度。
优选地，所述支撑框远离所述磁体一端环绕所述第二通孔设置有一周圈凹槽。
优选地，所述支撑框远离所述磁体一端还设置有若干第一凹槽，所述第一凹槽两端分别连通所述第二通孔远离磁体一端以及外界。
优选地，所述开合组件包括开合主体，所述开合主体上设置有第二凹槽，所述第二凹槽正对所述第一凹槽设置，当开合组件盖合于所述支撑框时，所述第一凹槽和所述第二凹槽形成波导通道。
优选地，所述开合组件包括开合主体，所述开合主体包括一第三通孔，所述第三通孔远离所述磁体一端设置有透明件，所述透明件将所述第三通孔密封，所述透明件内部嵌有一层、两层或多层屏蔽层，以实现良好的屏蔽效果，所述透明件边缘延伸设置一导电层，所述导电层用以实现所述屏蔽层与所述开合主体的电气连接。
优选地，所述开合主体还包括设置于所述开合主体靠近所述磁体一侧的屏蔽组件，所述屏蔽组件包括若干屏蔽件，若干所述屏蔽件环绕所述第三通孔设置，形成一个包围所述第三通孔的屏蔽圈，所述屏蔽件为弹性屏蔽件，所述开合组件盖合于所述支撑框时，所述屏蔽组件嵌入到所述周圈凹槽内。
优选地，所述磁体第二端设置有若干线缆引出孔，所述后屏蔽装置包括一屏蔽框及若干屏蔽管，所述屏蔽框上设置有若干线缆引出孔、一组进风口、一组出风口及透明件，若干所述屏蔽管插入到磁体第二端的线缆引出孔及屏蔽框的线缆引出孔内，所述屏蔽管插入到磁体第二端及屏蔽框的线缆引出孔内的一端设置有导电层和/或屏蔽层，以实现屏蔽管与线缆引出孔的电气连接，所述进风口及所述出风口由若干波导通道构成。
与现有技术相比，所述自屏蔽式磁共振装置通过在磁体的两端设置前屏蔽装置和后屏蔽装置，采用柔性屏蔽材料形成柔性屏蔽层、弹性屏蔽件与周圈凹槽配合实现周向屏蔽，透明件包含屏蔽层实现轴向屏蔽，此外，在前屏蔽装置和后屏蔽装置均形成有波导通道，与柔性屏蔽层、弹性屏蔽件、透明件的屏蔽层共同完成了磁共振装置的射频屏蔽。
【附图说明】
图1为本发明自屏蔽式磁共振装置的立体结构示意图；
图2为本发明自屏蔽式磁共振装置的又一立体结构示意图；
图3为本发明自屏蔽式磁共振装置的局部剖面示意图；
图4为图3中A部分的局部放大示意图；
图5为本发明自屏蔽式磁共振装置的支撑框的结构示意图；
图6为本发明自屏蔽式磁共振装置的开合组件的结构示意图；
图7为本发明自屏蔽式磁共振装置的开合组件盖合在支撑框上的剖面示意图；
图8为图7中B部分的局部放大示意图；
图9为图7中C部分的局部放大示意图；
图10为本发明自屏蔽式磁共振装置的旋转组件的结构示意图；
图11为本发明自屏蔽式磁共振装置的后屏蔽装置结构示意图；
图12为本发明自屏蔽式磁共振装置的后屏蔽装置的局部剖面结构示意图。
【具体实施方式】
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施实例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用于解释本发明，并不用于限定本发明。
需要说明，本发明实施例中所有方向性指示(诸如上、下、左、右、前、后、内、外……)仅限于指定视图上的相对位置，而非绝对位置。
另外，在本发明中如涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
请参阅图1，本发明提供一种自屏蔽式磁共振装置100，其包括磁体10、前屏蔽装置20和后屏蔽装置30，所述磁体10包括相对设置的第一端11和第二端13，所述前屏蔽装置20设置于第一端11，第一端11靠近扫描床设置，所述后屏蔽装置30设置于第二端13，第二端13用以连接线缆，被所述后屏蔽装置30密封。
所述磁体10的第一端11设置有一第一通孔15，且所述第一端11沿所述第一通孔15的周缘向外延伸形成有一凸缘17，所述凸缘17与所述前屏蔽装置20之间填充有柔性屏蔽材料形成有柔性屏蔽层19，以实现第一端11的屏蔽。例如可以是，所述凸缘17和/或前屏蔽装置20相接处设置有一环形槽道，环形槽道内填充柔性屏蔽材料。
请继续参阅图2，所述前屏蔽装置20包括支撑框21、旋转组件23及开合组件25，所述支撑框21固定于所述磁体10的第一端11，所述开合组件25通过所述旋转组件23转动连接于所述支撑框21。具体地，所述支撑框21对应所述第一通孔15设置有第二通孔211，所述第二通孔211包括内径不等的第一部分2111和第二部分2113，使得所述第一部分2111和第二部分2113之间形成阶梯状构造，且第一部分2111和第二部分2113的梯度差等于所述凸缘17的厚度。所述凸缘17收容于所述第一部分2111并抵接于第二部分2113，且柔性屏蔽材料填充于所述第一部分2111的内壁与所述凸缘17之间，所述第二部分2113的内径等于所述第一通孔15的内径。
请参阅图3至图5，所述支撑框21远离所述磁体10一端环绕所述第二通孔211设置有一周圈凹槽213，用于与开合组件25上对应的部件配合以对第二通孔211周向形成屏蔽，所述支撑框21一侧向外延伸形成两个转接柱215，所述转接柱215开设有转孔，所述转孔为盲孔，所述旋转组件23部分伸入到所述转孔内。所述支撑框21与所述转接柱215相对的一侧设置有锁紧腔217，所述开合组件25盖合与所述支撑框21时通过所述锁紧腔217锁定。所述锁紧腔217于所述周圈凹槽213外侧、靠近所述支撑框21边缘设置。
所述锁紧腔217包括锁合腔和一锁孔2171，所述锁合腔为所述支撑框的一内腔，并通过所述锁孔2171与外界连通，所述锁孔2171大体呈狭长的十字形。
所述支撑框21远离所述磁体10一端还设置有若干第一凹槽219，所述第一凹槽219两端分别连通所述第二通孔211的远离磁体10一端以及外界(空气)。所述周圈凹槽213横穿所述第一凹槽219将相邻的第一凹槽219连通，且所述第一凹槽219的深度小于所述周圈凹槽213的深度。
请继续参阅图6至图9，所述开合组件25包括开合主体251、旋钮锁253以及枢接轴255，所述旋钮锁253与所述枢接轴255均依托于所述开合主体251设 置，所述枢接轴255设置于所述开合主体251一侧，对应所述转接柱215设置，两个所述转接柱215之间的距离大体等于所述枢接轴255的长度，所述旋钮锁253设置于所述开合主体251与所述枢接轴255相对的一侧。
所述枢接轴255设置有转孔，旋转组件23伸入到所述枢接轴255的转孔及所述转接柱215的转孔内，所述枢接轴255的转孔可以是贯穿所述枢接轴255长度方向的通孔，也可以是设置于所述枢接轴255两端的盲孔，可以理解，当所述枢接轴255的转孔为通孔时，所述转孔只设置一个，为盲孔时，则所述枢接轴两端各设置一个转孔。
所述开合主体251包括一第三通孔2511，所述第三通孔2511远离所述磁体10一端设置有透明件2513，所述透明件2513将所述第三通孔2511密封，所述透明件2513还具有射频屏蔽功能，具体地，所述透明件2513包括一层、两层或多层屏蔽层，所述屏蔽层内嵌于所述透明件2513内部，以实现良好的屏蔽效果，所述透明件2513边缘延伸设置一导电层，所述导电层实现所述屏蔽层与所述开合主体251的电气连接。
所述开合主体251还包括屏蔽组件2515，所述屏蔽组件2515设置于所述开合主体251靠近所述磁体10一侧，且环绕所述第三通孔2511设置，所述屏蔽组件2515包括若干屏蔽件，若干所述屏蔽件环绕所述第三通孔2511设置，形成一个包围所述第三通孔的屏蔽圈，所述屏蔽组件2515与所述周圈凹槽213相配合。所述屏蔽件为弹性屏蔽件，当所述开合组件25盖合于所述支撑框21时，所述屏蔽组件2515刚好嵌入到所述周圈凹槽213内，从而实现第二通孔211周向方向的屏蔽。
所述开合主体251上还设置有若干第二凹槽2517，所述第二凹槽2517正对所述第一凹槽219设置，当开合组件25盖合于所述支撑框21时，所述第一凹槽219和所述第二凹槽2517共同构成若干波导通道，当射频信号穿过波导通道时，射频信号随着不断深入波导通道而不断衰减，最终衰减为对磁共振装置使用无妨碍的较弱信号，从而实现射频屏蔽。所述第二凹槽2517连通第三通孔及外界。
所述旋钮锁253为旋转式开关，包括锁扣(图未标)及旋钮(图未标)，所述锁扣与所述锁孔对应，呈狭长十字形，需要关闭时，按压旋钮，在旋转 一定角度，使得锁扣进入到锁合腔，并且被卡合，完成关闭过程，开启过程与之相反。
所述旋转组件23包括旋转轴231，所述旋转轴231外侧涂覆有阻尼脂，使得所述旋转轴231在所述枢接轴255与所述转接柱215的转孔内转动时，具有一定的阻力，从而使所述开合组件25可以相对所述支撑框21开合停放于任意角度。当所述枢接轴255的转孔为通孔时，所述旋转轴231从所述枢接轴的转孔中穿过，两端分别伸入到所述转接柱215的转孔内，此时将所述旋转轴231的两端分别与所述转接柱215固定，开合组件25在开合时，开合组件25相对所述旋转轴231转动。
优选地，所述支撑框21、所述旋转组件23及所述开合主体251由满足屏蔽需要的无磁或接近无磁的材料制成。
所述前屏蔽装置20通过所述周圈凹槽213与环绕所述第三通孔2511设置的屏蔽组件2515，实现了第一通孔15在周向方向的屏蔽，通过在透明件2513设置屏蔽层，实现轴向方向的屏蔽，此外，若干所述第一凹槽219与若干所述第二凹槽2517形成的若干波导通道也实现了射频屏蔽。
请参阅图10至图11，所述磁体10第二端13设置有若干线缆引出孔，所述后屏蔽装置30包括一屏蔽框31及若干屏蔽管，所述屏蔽框31与所述磁体10第二端13的固定类似与所述支撑框21与所述磁体10第一端11的固定，所述磁体10的第二端13开设有第四通孔以及环绕所述第四通孔设置有第二凸缘，所述屏蔽框与所述第二凸缘之间也设置有柔性屏蔽材料。
所述屏蔽框31上设置有若干线缆引出孔311、一组进风口313、一组出风口315及透明件，若干所述屏蔽管插入到磁体第二端的线缆引出孔及屏蔽框的线缆引出孔内，所述屏蔽管插入到磁体第二端及屏蔽框的线缆引出孔内的一端设置有导电层或屏蔽层，以实现屏蔽管与线缆引出孔的电气连接，所述进风口313及所述出风口315由若干波导通道构成。
所述透明件与所述前屏蔽装置20的透明件相同，为内嵌有屏蔽层的透明件。
所述屏蔽管伸入到所述线缆引出孔内以将所述自屏蔽式磁共振装置100的线缆引出，线缆收容在所述屏蔽管内。
优选地，所述屏蔽框31、所述屏蔽管由满足屏蔽需要的无磁或接近无磁的材料制成。
以对动物进行成像为例，使用所述自屏蔽式磁共振装置100进行扫描时，将待扫描的动物稳固置于扫描床上且处于麻醉状态，需要佩戴有麻醉管、氧气管和生命体征的监护装置。此处假设开合组件25闭合为初始状态，操作人员将按以下步骤进行操作：
第一步，解开旋钮锁253，使开合组件25处于开启状态，并且让开合组件25稳定处于一个合适的位置；
第二步，将扫描床经过支承框21的第二通孔211送入磁体10内部合适的位置；
第三步，将麻醉管、氧气管等其他管状物置于支承框21的第一凹槽219内；
第四步，将开合组件25关闭，并锁紧旋钮锁253。
此时，开合组件25上的弹性屏蔽件与支承框21的周圈凹槽213内壁严密接触；开合组件25上的第二凹槽2517与支承框21上的第一凹槽219共同构成狭长通道，形成了波导，进一步使得磁体10处于屏蔽状态。此时，可启动相关设备对待扫描的动物进行扫描。在整个扫描过程中，相关人员可以通过透明件观察磁体10内部情况。
与现有技术相比，所述自屏蔽式磁共振装置100通过在磁体的两端设置前屏蔽装置20和后屏蔽装置30，采柔性屏蔽材料形成柔性屏蔽层、弹性屏蔽件与周圈凹槽213配合实现周向屏蔽，透明件包含屏蔽层实现轴向屏蔽，此外，在前屏蔽装置20和后屏蔽装置30均形成有波导通道，与柔性屏蔽层、弹性屏蔽件、透明件的屏蔽层共同完成了磁共振装置的射频屏蔽。
以上所述仅为本发明的较佳实施例，并非因此限制本发明的专利范围，凡是在本发明的构思之内所作的任何修改，等同替换和改进等均应包含在本发明的专利保护范围内。

Claims (10)

  1. 自屏蔽式磁共振装置，其特征在于，包括磁体、前屏蔽装置和后屏蔽装置，所述磁体包括相对设置的第一端和第二端，所述前屏蔽装置设置于第一端，所述后屏蔽装置设置于第二端，所述前屏蔽装置及所述后屏蔽装置均包含波导通道。
  2. 如权利要求1所述的自屏蔽式磁共振装置，其特征在于，所述磁体的第一端设置有一第一通孔，且所述第一端沿所述第一通孔的周缘向外延伸形成一凸缘，所述凸缘与所述前屏蔽装置之间填充有柔性屏蔽材料形成有柔性屏蔽层以实现第一端的射频屏蔽。
  3. 如权利要求2所述的自屏蔽式磁共振装置，其特征在于，所述前屏蔽装置包括支撑框、旋转组件及开合组件，所述支撑框固定于所述磁体的第一端，所述开合组件通过所述旋转组件转动连接于所述支撑框。
  4. 如权利要求3所述的自屏蔽式磁共振装置，其特征在于，所述支撑框对应所述第一通孔设置有第二通孔，所述第二通孔包括内径不等的第一部分和第二部分，使得所述第一部分和第二部分之间形成阶梯状构造，且第一部分和第二部分的梯度差等于所述凸缘的厚度。
  5. 如权利要求4所述的自屏蔽式磁共振装置，其特征在于，所述支撑框远离所述磁体一端环绕所述第二通孔设置有一周圈凹槽。
  6. 如权利要求5所述的自屏蔽式磁共振装置，其特征在于，所述支撑框远离所述磁体一端还设置有若干第一凹槽，所述第一凹槽两端分别连通所述第二通孔远离磁体一端以及外界。
  7. 如权利要求6所述的自屏蔽式磁共振装置，其特征在于，所述开合组件包括开合主体，所述开合主体上设置有第二凹槽，所述第二凹槽正对所述第一凹槽设置，当开合组件盖合于所述支撑框时，所述第一凹槽和所述第二凹槽形成波导通道。
  8. 如权利要求5所述的自屏蔽式磁共振装置，其特征在于，所述开合组件包括开合主体，所述开合主体包括一第三通孔，所述第三通孔远离所述磁体一端设置有透明件，所述透明件将所述第三通孔密封，所述透明件内部嵌有一层、两层或多层屏蔽层，以实现良好的屏蔽效果，所述透明件边缘延伸设置一导电层，所述导电层用以实现所述屏蔽层与所述开合主体的电气连接。
  9. 如权利要求8所述的自屏蔽式磁共振装置，其特征在于，所述开合主体还包括设置于所述开合主体靠近所述磁体一侧的屏蔽组件，所述屏蔽组件包括若干屏蔽件，若干所述屏蔽件环绕所述第三通孔设置，形成一个包围所述第三通孔的屏蔽圈，所述屏蔽件为弹性屏蔽件，所述开合组件盖合于所述支撑框时，所述屏蔽组件嵌入到所述周圈凹槽内。
  10. 如权利要求1所述的自屏蔽式磁共振装置，其特征在于，所述磁体第二端设置有若干线缆引出孔，所述后屏蔽装置包括一屏蔽框及若干屏蔽管，所述屏蔽框上设置有若干线缆引出孔、一组进风口、一组出风口及透明件，若干所述屏蔽管插入到磁体第二端的线缆引出孔及屏蔽框的线缆引出孔内，所述屏蔽管插入到磁体第二端及屏蔽框的线缆引出孔内的一端设置有导电层和/或屏蔽层，以实现屏蔽管与线缆引出孔的电气连接，所述进风口及所述出风口由若干波导通道构成。
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CN106856654A (zh) * 2017-03-13 2017-06-16 深圳市金石医疗科技有限公司 自屏蔽式磁共振装置

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