External shielding case for nuclear magnetic resonance imaging

Abstract

An external shielding case for nuclear magnetic resonance imaging disclosed by the present invention comprises a mounting frame, the left side and the right side of the mounting frame are each fixedly provided with a triangular side plate, a bottom plate is fixedly connected between the bottoms of the two triangular side plates, and a stop block is fixedly arranged between the front ends of the two triangular side plates and the front end of the bottom plate. A cover plate is hinged to the top of the mounting frame, a sealing mechanism is arranged between the cover plate and the triangular side plates and between the cover plate and the check block, the sealing mechanism is used for covering the cover plate on the tops of the triangular side plates and the check block in a sealing mode, and the triangular side plates, the check block, the bottom plate and the cover plate form a shielding case body. The shielding case body is also provided with a wiring channel assembly. The shielding case is simple in structure and low in cost, has a relatively strong sealing effect, can better shield external noise, and can ensure that the nuclear magnetic resonance imaging effect is stable and clear. The device is especially suitable for small scientific research magnets or nuclear magnetic resonance equipment for animal examination.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic shielding, and in particular to an external shielding cover for nuclear magnetic resonance imaging. Background Art

[0002] Nuclear magnetic resonance imaging is widely used in medical diagnosis. It uses the characteristics of atomic nucleus spin motion, plus a superconducting magnetic field, to obtain electromagnetic signals from the human body after radio frequency pulse excitation. The signals are detected by the detector and transmitted to the computer. After computer processing and conversion, the patient's image is displayed on the screen and diagnosed by the doctor. The collection of human electromagnetic signals is completed by the detection coil of the nuclear magnetic resonance imaging.

[0003] When the nuclear magnetic resonance device is working, the imaging device needs to be used in conjunction with the room temperature hole in the middle of the device. The person or animal being tested needs to enter the imaging device in the room temperature hole in the middle of the nuclear magnetic resonance device to perform resonance imaging. Since the imaging device will receive electromagnetic waves of various frequencies, noise will appear in the image after imaging. Therefore, general human imaging devices will be equipped with a shielding room to shield external noise, thereby minimizing the generation of noise and improving the imaging effect. However, the cost of human imaging equipment is high. Even compared with the construction cost of a shielding room of tens of millions, the cost of the shielding room will be worth it.

[0004] However, for small scientific research magnets or MRI equipment used for animal examinations, their cost is relatively low and they occupy relatively little space. The cost of building a shielded room tailor-made for them seems wasteful. However, due to the lack of shielding means, the imaging effect will not be able to achieve the imaging effect that the equipment should have. Ordinary shielding equipment simply seals the room temperature hole through the shell. The actual shielding effect achieved is just to provide some sound insulation. The isolation effect for various interference waves is very poor, and it is difficult to achieve a high shielding efficiency. Summary of the invention

[0005] With respect to the existing technologies of the above-mentioned small scientific research magnets or nuclear magnetic resonance equipment for animal examination, the purpose of the present invention is to provide an external shielding cover for nuclear magnetic resonance imaging, aiming to at least solve the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned purpose, the technical solutions adopted by the present invention are as follows:

[0006] An external shielding cover for magnetic resonance imaging comprises a mounting frame, wherein a triangular side panel is fixedly provided on the left and right sides of the mounting frame respectively, a bottom plate is fixedly connected between the bottoms of the two triangular side panels, a stopper is fixedly provided between the front ends of the two triangular side panels and the front end of the bottom plate, a cover plate is hingedly provided on the top of the mounting frame, a closing mechanism is provided between the cover plate, the triangular side panels and the stopper, the closing mechanism is used for sealing the cover plate on the triangular side panels and the top of the stopper, the triangular side panels, the stopper, the bottom plate and the cover plate constitute a shielding cover body, and a wiring channel assembly is also provided on the shielding cover body.

[0007] As a further solution of the present invention: the closing mechanism includes a closing ring, a shielding ring and a compensation strip, the closing ring is fixedly arranged on the triangular side plate and the inner wall of the block, the compensation strip is fixedly connected between the closing ring and the mounting frame, the shielding ring is fixedly arranged on the bottom of the cover plate, and the shielding ring is adapted to the closing ring.

[0008] As a further solution of the present invention: a plurality of copper reeds are fixedly arranged on the inner side wall of the closed ring, the lower half of the copper reed is a plane, and the upper half of the copper reed is a compressible elastic protrusion structure.

[0009] As a further solution of the present invention: support blocks are fixedly connected to the inner side walls of the triangular side plates, a hydraulic rod is rotatably provided on the support block, and the telescopic end of the hydraulic rod is rotatably connected to the bottom of the cover plate.

[0010] As a further solution of the present invention: an observation port is provided at the center of the cover plate, and two observation glass plates are fixedly installed at the observation port.

[0011] As a further solution of the present invention: a copper mesh is fixedly arranged between the two observation glass plates.

[0012] As a further solution of the present invention: the wiring channel assembly includes two relatively arranged connecting blocks, and the two relatively arranged connecting blocks are both provided with semicircular wire passing grooves. The upper connecting block is fixedly set at the front end of the bottom of the cover plate, and the lower connecting block is fixedly set in the fixed groove opened at the top of the block.

[0013] As a further solution of the present invention: the size of the fixing groove is equal to the size of the upper engaging block and the lower engaging block after being assembled.

[0014] As a further solution of the present invention: the wiring channel assembly includes a sealing plate and a stainless steel connecting pipe, the sealing plate is fixedly arranged at the opening opened on the bottom plate, and a plurality of the stainless steel connecting pipes are fixedly embedded in the sealing plate.

[0015] As a further solution of the present invention: a handle is provided on a side of the top of the cover plate away from the installation frame.

[0016] Beneficial effects of the present invention:

[0017] (1) The external shielding cover for nuclear magnetic resonance imaging provided by the present invention can be fixedly mounted on the end of the corresponding nuclear magnetic resonance superconducting magnet through an installation frame. A triangular side plate, a stopper and a bottom plate are welded on one side of the installation frame. The cover plate is sealed and covered on the top of the triangular side plate and the stopper through a closing mechanism. The triangular side plate, the stopper, the bottom plate and the cover plate constitute the shielding cover body. The shielding cover body is also provided with a wiring channel assembly. In the present invention, by providing a closing mechanism, the sealing effect of the shielding cover is enhanced, and the external noise is better shielded, so that the stable and clear nuclear magnetic resonance imaging effect can be ensured. By providing the wiring channel assembly, the external noise can be eliminated and shielded while ensuring the arrangement and passage of cables.

[0018] (2) The sealing mechanism of the present invention comprises a sealing ring, a shielding ring and a compensation strip. The shielding ring is matched with the sealing ring. The sealing ring, the shielding ring and the compensation strip are fixed to corresponding positions by welding to improve the sealing effect. In addition, a plurality of copper springs are fixedly arranged on the inner wall of the sealing ring. The copper material has a good effect of isolating noise and electromagnetic waves. At the same time, the arc-shaped arrangement can make the upper part of the sealing ring elastic, that is, it can be compressed. The sealing effect is better than the connection effect of metal rigid bonding, which can greatly improve the sealing effect inside the shielding cover.

[0019] (3) For the front end and the rear end of the nuclear magnetic resonance superconducting magnet, the present invention sets up wiring channel components with different structures, which improves the applicability of the present invention and has a better effect of eliminating and shielding external noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the structure of an external shielding cover for magnetic resonance imaging of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of an external shielding cover for magnetic resonance imaging of the present invention;

[0023] Figure 3 yes Figure 2 Front view of the structure;

[0024] Figure 4 yes Figure 3 AA sectional view of FIG.

[0025] Figure 5 yes Figure 4 A magnified schematic diagram of the structure at C in the middle;

[0026] Figure 6 It is a schematic diagram of the structure of an external shielding cover for magnetic resonance imaging in the second embodiment of the present invention.

[0027] In the figure: 1. Installation frame; 2. Side plate; 3. Bottom plate; 4. Stop block; 5. Closing ring; 6. Compensation strip; 7. Copper spring; 8. Cover plate; 9. Shielding ring; 10. Joint block; 11. Observation glass plate; 12. Copper mesh; 13. Support block; 14. Hydraulic rod; 15. Handle; 16. Closing plate; 17. Connecting pipe. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that terms such as "up", "down", "left", "right", "front" and "back" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation. Therefore, they should not be understood as limitations on the present invention.

[0030] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] See also Figure 1-5 As shown, the first embodiment of the present invention provides an external shielding cover for nuclear magnetic resonance imaging, including a mounting frame 1, and a plurality of waist-shaped holes are evenly arranged on the edges of the mounting frame 1. The surface of the small magnet can be stud-welded corresponding to the waist-shaped holes, and then the mounting is completed by the cooperation of the mounting frame 1 and the studs, and the mounting frame 1 and the overall shielding cover are fixedly mounted and installed by nuts. It should be noted that since the surface of the mounting frame 1 and the outer end face of the magnet are completely bonded between metal surfaces, when the mounting frame 1 and the end face of the magnet are bonded, soft copper cloth can be used for filling, and then the copper cloth can be compacted by nuts to further improve the sealing effect.

[0033] See also Figure 2 As shown, in this embodiment, a triangular side panel 2 is fixedly welded on the left and right sides of the installation frame 1, and the height of the triangular side panel 2 is the same as the inner edge of the installation frame 1. The bottom of the two triangular side panels 2 is fixedly connected to the bottom plate 3. The two triangular side panels 2 and the bottom plate 3 are fixed by welding, and they need to be fully welded to avoid gaps that cause noise interference. A stopper 4 is fixedly set between the front ends of the two triangular side panels 2 and the front end of the bottom plate 3. The stopper 4 is fixed to the front ends of the two triangular side panels 2 and the front end of the bottom plate 3 by welding, and they need to be fully welded.

[0034] Please continue reading Figure 2 As shown, in this embodiment, a cover plate 8 is hingedly connected to the top of the mounting frame 1, and a closing mechanism is provided between the cover plate 8, the triangular side plate 2 and the stopper 4. After the cover plate 8 covers the top of the two triangular side plates 2 and the stopper 4, the closing mechanism seals the cover plate 8 on the top of the triangular side plates 2 and the stopper 4. At this time, the triangular side plates 2, the stopper 4, the bottom plate 3 and the cover plate 8 form a shielding cover body, and a wiring channel assembly is also provided on the shielding cover body to provide conditions for the radio frequency line of the magnetic resonance imaging equipment and the anesthesia tube and other lines to pass through.

[0035] See also Figure 1 As shown, in this embodiment, a handle 15 is provided on the top side of the cover plate 8 away from the installation frame 1 , and the handle 15 is provided to facilitate opening and closing of the cover plate 8 .

[0036] Please combine Figure 2 and Figure 3 As shown, in this embodiment, the sealing mechanism at least includes a sealing ring 5, a shielding ring 9 and a compensation strip 6. The sealing ring 5 is fixedly arranged on the inner wall of the triangular side plate 2 and the stopper 4, and the compensation strip 6 is fixedly connected between the sealing ring 5 and the mounting frame 1. The compensation strip 6 is used to seal the gap between the sealing ring 5 and the mounting frame 1. The shielding ring 9 is fixedly arranged on the bottom of the cover plate 8, and the shielding ring 9 is adapted to the sealing ring 5. The sealing ring 5, the shielding ring 9 and the compensation strip 6 are fixed to the corresponding positions by welding to improve the sealing effect.

[0037] Furthermore, in this embodiment, a plurality of copper reeds 7 are fixedly arranged on the inner side wall of the closed ring 5, the lower half of the copper reed 7 is a plane, and the upper half of the copper reed 7 is a compressible elastic protrusion structure. The copper reed 7 is used for installation and fixed crimping, and the upper half of the copper reed 7 can be a variety of compressible shapes such as arc, triangle, and wave, and is made of pure copper. Copper has a very good isolation effect on noise and electromagnetic waves. At the same time, the arc setting can make its upper half elastic, that is, it can be compressed, and the sealing effect is better than the connection effect of metal rigid bonding, which can greatly improve the sealing effect inside the shielding cover.

[0038] Please continue to combine Figure 2 and Figure 3 As shown, in this embodiment, the inner side walls of the triangular side panels 2 are fixedly connected with support blocks 13, and a hydraulic rod 14 is rotatably provided on the support blocks 13, and the telescopic end of the hydraulic rod 14 is rotatably connected to the bottom of the cover plate 8. When in use, after the cover plate 8 is opened, the hydraulic cylinder can support the opened cover plate 8, which is convenient for placing small animals and scientific research materials.

[0039] Please combine Figure 3 and Figure 5 As shown, an observation port is provided in the center of the cover plate 8, two observation glass plates 11 are fixedly installed at the observation port, and a copper mesh 12 is fixedly arranged between the two observation glass plates 11. The glass plates also cannot completely isolate the entry of external noise, and the copper mesh 12 is used to seal the observation port to improve the sealing performance.

[0040] See also Figure 2 As shown, in this embodiment, the wiring channel assembly includes two relatively arranged joint blocks 10, and the two relatively arranged joint blocks 10 are both provided with semicircular wire-passing grooves. The upper joint block 10 is fixedly arranged at the front end of the bottom of the cover plate 8, and the lower joint block 10 is fixedly arranged in the fixed groove opened at the top of the stopper 4, see Figure 1 As shown, the size of the fixed groove is equal to the size of the two joint blocks 10 after being spliced. The two semicircular wire grooves are combined into a whole circular groove, which can be used to pass the anesthesia tube and radio frequency line required by the imaging device. The joint block 10 is made of stainless steel. The prototype stainless steel pipeline of a certain length can synchronize the waves emitted from the outside into the shielding cover and eliminate them, thereby eliminating and shielding the external noise while ensuring the arrangement and passage of the cables.

[0041] Embodiment 2

[0042] See also Figure 6 As shown, embodiment 2 of the present invention provides an external shielding cover for magnetic resonance imaging, including a mounting frame 1, a triangular side panel 2 is fixedly provided on the left and right sides of the mounting frame 1, a bottom plate 3 is fixedly connected between the bottoms of the two triangular side panels 2, a stopper 4 is fixedly provided between the front ends of the two triangular side panels 2 and the front end of the bottom plate 3, a cover plate 8 is hingedly provided on the top of the mounting frame 1, a closing mechanism is provided between the cover plate 8 and the triangular side panels 2 and the stopper 4, the closing mechanism is used to seal the cover plate 8 on the top of the triangular side panels 2 and the stopper 4, the triangular side panels 2, the stopper 4 and the cover plate 8 constitute a shielding cover body, and a wiring channel assembly is also provided on the shielding cover body.

[0043] The difference between the second embodiment and the first embodiment is that the structure of the wiring channel component is different, and the other structures are the same as those in the first embodiment. The wiring channel component in the second embodiment is described in detail below:

[0044] Generally, the front end of a nuclear magnetic resonance superconducting magnet can be sealed using the structure of the first embodiment to achieve a shielding function. However, due to the installation of the gradient coil at the rear end of the nuclear magnetic resonance superconducting magnet, a large number of wires need to be connected to external devices. It is difficult for a plurality of connecting wires with larger diameters to pass through a whole circular groove formed by merging the two semicircular wire grooves in the first embodiment. Therefore, different wiring channel components are designed.

[0045] See also Figure 6 As shown, in this embodiment, the wiring channel assembly includes a sealing plate 16 and a stainless steel connecting pipe 17. The sealing plate 16 is fixedly arranged at the opening opened on the bottom plate 3. A plurality of stainless steel connecting pipes 17 are fixedly embedded in the sealing plate 16. The stainless steel connecting pipes 17 are connected to the sealing plate 16 by full welding.

[0046] In the actual implementation process, the coupling block 10 inside the block 4 and the coupling block 10 at the lower end of the cover plate 8 can be removed, and the installation groove in the block 4 can be filled. In combination with the setting of the cover plate 8, the closing ring 5 and the shielding ring 9, a better sealing effect can be achieved compared to the front end.

[0047] The length of the stainless steel pipe proposed in the first embodiment can weaken the external noise and electromagnetic waves. The diameter of the connecting pipe 17 in this embodiment can be adapted by mapping the outlet wire specifications of the gradient coil, and then the length of the connecting pipe 17 required for different pipe diameters can be controlled to suppress and weaken the external electromagnetic waves from entering the shielding cover body. Several stainless steel connecting pipes 17 can meet the installation requirements of a large number of wires that need to be connected to external equipment due to the installation of the gradient coil at the rear end of the nuclear magnetic resonance superconducting magnet.

[0048] Working principle: Before performing nuclear magnetic resonance imaging, the external shielding cover for nuclear magnetic resonance imaging provided in Example 1 can be installed at the front end of the nuclear magnetic resonance superconducting magnet, the cover plate 8 can be opened by the handle 15, the imaging coil can be pulled out from the room temperature hole, and the loading of animals or scientific research materials can be completed. After the loading is completed, the imaging coil can be pushed back to the room temperature hole, and the anesthesia tube, radio frequency line, etc. can be placed in the two semicircular wire grooves in the baffle to merge into a whole circular groove, and the cover plate 8 can be closed by the handle 15. After the cover plate 8 is closed, the copper reed 7 on the inner wall of the closed ring 5 can be compressed by the shielding ring 9. After the cover plate 8 is completely covered, the nuclear magnetic resonance work and imaging can be prepared. Similarly, the external shielding cover for nuclear magnetic resonance imaging provided in Example 2 can be installed at the rear end of the nuclear magnetic resonance superconducting magnet, and a large number of wires that need to be connected to external equipment at the rear end of the nuclear magnetic resonance superconducting magnet can be placed in multiple connecting tubes 17.

[0049] In summary, the external shielding cover for nuclear magnetic resonance imaging disclosed by the present invention has a simple structure, low cost, strong sealing effect, better shielding of external noise, and can ensure stable and clear nuclear magnetic resonance imaging effect. It is particularly suitable for small scientific research magnets or nuclear magnetic resonance equipment for animal examination.

[0050] The above is a detailed description of the preferred embodiments of the present invention, which cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. An external shielding cover for magnetic resonance imaging, characterized in that: The invention comprises an installation frame (1), wherein a triangular side panel (2) is fixedly arranged on the left and right sides of the installation frame (1), a bottom panel (3) is fixedly connected between the bottoms of the two triangular side panels (2), a stopper (4) is fixedly arranged between the front ends of the two triangular side panels (2) and the front end of the bottom panel (3), a cover panel (8) is hingedly connected to the top of the installation frame (1), a closing mechanism is arranged between the cover panel (8), the triangular side panels (2) and the stopper (4), and the closing mechanism is used to seal the cover panel (8) on the top of the triangular side panels (2) and the stopper (4), the triangular side panels (2), the stopper (4), the bottom panel (3) and the cover panel (8) constitute a shielding cover body, and a wiring channel assembly is also arranged on the shielding cover body.

2. The external shielding cover for nuclear magnetic resonance imaging according to claim 1, characterized in that: The sealing mechanism comprises a sealing ring (5), a shielding ring (9) and a compensation strip (6); the sealing ring (5) is fixedly arranged on the inner wall of the triangular side plate (2) and the stopper (4); the compensation strip (6) is fixedly connected between the sealing ring (5) and the mounting frame (1); the shielding ring (9) is fixedly arranged on the bottom of the cover plate (8); and the shielding ring (9) is adapted to the sealing ring (5).

3. The external shielding cover for nuclear magnetic resonance imaging according to claim 2, characterized in that: A plurality of copper reeds (7) are fixedly arranged on the inner side wall of the closed ring (5); the lower half of the copper reed (7) is a plane, and the upper half of the copper reed (7) is a compressible elastic protrusion structure.

4. The external shielding cover for nuclear magnetic resonance imaging according to claim 1, characterized in that: The inner side walls of the triangular side plates (2) are fixedly connected with support blocks (13), the support blocks (13) are rotatably provided with hydraulic rods (14), and the telescopic ends of the hydraulic rods (14) are rotatably connected to the bottom of the cover plate (8).

5. The external shielding cover for nuclear magnetic resonance imaging according to claim 1, characterized in that: An observation port is provided at the center of the cover plate (8), and two observation glass plates (11) are fixedly mounted at the observation port.

6. The external shielding cover for nuclear magnetic resonance imaging according to claim 5, characterized in that: A copper mesh (12) is fixedly arranged between the two observation glass plates (11).

7. The external shielding cover for nuclear magnetic resonance imaging according to claim 1, characterized in that: The wiring channel assembly comprises two relatively arranged joint blocks (10), and the two relatively arranged joint blocks (10) are both provided with semicircular wire-passing grooves, the upper joint block (10) is fixedly arranged at the front end of the bottom of the cover plate (8), and the lower joint block (10) is fixedly arranged in a fixed groove provided at the top of the stop block (4).

8. An external shielding cover for nuclear magnetic resonance imaging according to claim 7, characterized in that: The size of the fixing groove is equal to the size of the upper joint block (10) and the lower joint block (10) after being assembled.

9. The external shielding cover for nuclear magnetic resonance imaging according to claim 1, characterized in that: The wiring channel assembly comprises a sealing plate (16) and a stainless steel connecting pipe (17); the sealing plate (16) is fixedly arranged at a through opening opened on the bottom plate (3); and a plurality of the stainless steel connecting pipes (17) are fixedly embedded in the sealing plate (16).

10. The external shielding cover for nuclear magnetic resonance imaging according to claim 1, characterized in that: A handle (15) is provided on a side of the top of the cover plate (8) away from the installation frame (1).

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