CN217332811U - Magnet assembly and magnetic resonance equipment - Google Patents
Magnet assembly and magnetic resonance equipment Download PDFInfo
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- CN217332811U CN217332811U CN202220714924.8U CN202220714924U CN217332811U CN 217332811 U CN217332811 U CN 217332811U CN 202220714924 U CN202220714924 U CN 202220714924U CN 217332811 U CN217332811 U CN 217332811U
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Abstract
The disclosure relates to the technical field of magnetic resonance, and particularly provides a magnet assembly component and magnetic resonance equipment. A magnet assembly comprising: the magnetic array comprises a plurality of annular magnetic array units which are sequentially stacked along the axial direction, and a plurality of magnets are arranged on each magnetic array unit along an annular shape; the upper part of the support frame is suitable for bearing the magnet array; and the fixing structure is used for fixedly assembling the magnet array and the support frame. The magnet assembly component of the embodiment of the disclosure has the advantages of simple structure and simple and convenient assembly process, and is beneficial to realizing the miniaturization and mobile portability of an MRI system.
Description
Technical Field
The disclosure relates to the technical field of magnetic resonance, in particular to a magnet assembly component and magnetic resonance equipment.
Background
Magnetic Resonance Imaging (MRI) is a technique for acquiring information on a molecular structure and an internal tissue of an object by using the principle of Magnetic Resonance. At present, the magnet structure of the MRI system is mainly divided into a superconducting magnet and a permanent magnet, the permanent magnet MRI system generates a required magnetic field by using the permanent magnet without external energy, and compared with the superconducting magnet, the MRI system has the advantages of low energy consumption, low cost and the like.
In the related art, most of the MRI systems based on the permanent magnet adopt a C-type antipodal permanent magnet structure, and the magnet structure needs to use an iron yoke to fix the magnet, so that the MRI system is bulky and heavy, and is not easy to miniaturize and carry.
SUMMERY OF THE UTILITY MODEL
To solve the assembly problem of the magnet array of the MRI system, the embodiments of the present disclosure provide a magnet assembly and a magnetic resonance apparatus.
In a first aspect, embodiments of the present disclosure provide a magnet assembly comprising:
the magnetic array comprises a plurality of annular magnetic array units which are sequentially stacked along the axial direction, and a plurality of magnets are arranged on each magnetic array unit along an annular shape;
the upper part of the support frame is suitable for bearing the magnet array; and the number of the first and second groups,
and the fixing structure is used for fixedly assembling the magnet array and the support frame.
In some embodiments, the fixing structure includes fixing blocks respectively fixed to two ends of the support frame, and the fixing blocks are abutted to two axial end faces of the magnet array to axially limit the magnet array.
In some embodiments, the support frame comprises a base plate, the base plate adapted to carry the magnet array thereabove; the fixing structure comprises at least two bottom pin shafts which are arranged on the bottom plate in parallel along the axial direction, and at least two clamping grooves which are arranged on the outer surface of the magnet array along the axial direction;
when the magnet array is assembled with the supporting frame, the bottom pin shaft is clamped and connected with the clamping groove to radially limit the magnet array.
In some embodiments, the bottom pin is a cylindrical pin, the slot is a right-angle slot formed in the surface of the magnet array, and when the magnet array is assembled with the support frame, the circumferential surface of the cylindrical pin abuts against two wall surfaces of the right-angle slot.
In some embodiments, the support frame further includes positioning brackets disposed on two sides of the bottom plate, the positioning brackets and the bottom plate form an arc-shaped receiving groove, and the magnet array is disposed in the receiving groove.
In some embodiments, the fixing structure further comprises a first semicircular groove formed in the positioning bracket, a second semicircular groove formed in the magnet array, and a side pin shaft, wherein when the magnet array is assembled with the support frame, the first semicircular groove and the second semicircular groove form a complete circular groove, and the side pin shaft penetrates through the circular groove.
In some embodiments, the first semicircular groove is formed along the axial direction at a position of the circular arc-shaped end of the positioning bracket, and the second semicircular groove is formed along the axial direction at a position of the magnet array corresponding to the first semicircular groove.
In some embodiments, at least one of the magnet array and the support frame is made of a non-ferrous material.
In a second aspect, the disclosed embodiments provide a magnetic resonance apparatus comprising:
a magnet fitting assembly according to any of the embodiments of the first aspect; and
a plurality of magnets provided in the magnet array unit.
In some embodiments, for each magnet array unit, the plurality of magnets are arranged in a halbach arrangement in a circumferential direction of the magnet array unit.
The magnet assembly component comprises a magnet array, a support frame and a fixing structure, wherein the magnet array comprises a plurality of annular magnet array units which are sequentially stacked along the axial direction, a plurality of magnets are arranged on each magnet array unit along the annular direction, the magnet array is suitable for being carried above the support frame, and the fixing structure is used for fixedly assembling the magnet array and the support frame. In the embodiment of the disclosure, the magnet assembly of the MRI system is realized by using the magnet assembly component, the whole machine has a simple structure, the assembly process is simple and convenient, repeated disassembly and assembly are not needed, and the reliability of the system is ensured to the maximum extent. In addition, in the embodiment of the disclosure, the permanent magnet is not required to be assembled by using an iron yoke, so that the volume and the weight of the MRI system can be reduced, and the miniaturization and the movement portability of the MRI system are favorably realized.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a permanent magnet structure of an MRI system according to some embodiments of the present disclosure.
Fig. 2 is a schematic view of an assembly structure of a magnet assembly according to some embodiments of the present disclosure.
Fig. 3 is a schematic diagram of a support bracket structure of a magnet mounting assembly according to some embodiments of the present disclosure.
Fig. 4 is a schematic view of an assembly principle of a magnet assembly according to some embodiments of the present disclosure.
Fig. 5 is a schematic view of an assembly principle of a magnet assembly according to some embodiments of the present disclosure.
Fig. 6 is a schematic view of an assembly principle of a magnet assembly according to some embodiments of the present disclosure.
Fig. 7 is a schematic illustration of an assembly principle of a magnet assembly according to some embodiments of the present disclosure.
Fig. 8 is a schematic view of an assembly principle of a magnet assembly according to some embodiments of the present disclosure.
Description of reference numerals:
100-a magnet array; 110-a magnet array unit; 111-card slot; 112-a second semi-circular groove; 200-a support frame; 210-a backplane; 220-bottom pin shaft; 230-fixed block; 240-positioning the bracket; 250-side pin shaft; 260-first semicircular groove; 300-round groove.
Detailed Description
The technical solutions of the present disclosure will be described below clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. In addition, technical features involved in different embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.
Magnetic Resonance Imaging (MRI) is a technique for acquiring information on a molecular structure and an internal tissue of an object by using the principle of Magnetic Resonance. The basic principle of nuclear magnetic resonance is that nuclei with non-zero magnetic moments undergo zeeman splitting at spin energy levels under the action of an external magnetic field, and the physical process of resonance absorption of radio-frequency radiation of a certain frequency. At present, the MRI technology is widely applied in the scenes of molecular composition and structural analysis, biological tissue and living tissue analysis, pathological analysis, medical diagnosis, nondestructive monitoring of products and the like.
Currently, the magnet structure of an MRI system can be mainly divided into a superconducting magnet and a permanent magnet. An MRI system of a superconducting magnet can generate a high-intensity magnetic field with high uniformity and high stability, but to maintain the superconducting properties of the superconducting material, the MRI system needs to be equipped with a complicated and expensive cooling system, which is high in energy consumption and high in cost. The MRI system of the permanent magnet can generate a required magnetic field by utilizing the residual magnetism of the permanent magnet without external energy, and has the advantages of low energy consumption and low cost compared with the MRI system of the superconducting magnet.
In the related art, most of MRI systems based on permanent magnets adopt C-type antipodal permanent magnet structures, and the C-type antipodal permanent magnet structures belong to open magnetic field structures, so that the permanent magnets need to be assembled by iron yokes to ensure the magnetic field intensity, so that the whole MRI system is large in size and weight, can only be used as a fixed position, and is difficult to realize miniaturization and mobile portability of the MRI system.
Based on the above existing defects, the embodiment of the present disclosure provides a magnet assembly component and a magnetic resonance apparatus having the magnet assembly component, and aims to implement fixed assembly of a complex permanent magnet array magnet of an MRI system by using the magnet assembly component of the present disclosure, simplify the magnet assembly process, and facilitate realization of miniaturization and portability of the MRI system.
In a first aspect, embodiments of the present disclosure provide a magnet mounting assembly for fixedly mounting a complex permanent magnet array magnet of an MRI system.
It will be appreciated that for a permanent magnet MRI system, the main magnetic field is provided by a plurality of permanent magnets arranged in a predetermined manner, for example, as shown in fig. 1, the permanent magnet structure of the MRI system comprises 1800 rare earth permanent magnets (e.g. neodymium iron boron permanent magnets), and the 1800 magnets are arranged in a cylinder shape, so as to generate the main magnetic field required for MRI imaging in the middle of the cylinder shape. The magnet assembly component can position and assemble a complex array cylindrical magnet.
In some embodiments, a magnet mounting assembly of embodiments of the present disclosure includes a magnet array, a support frame, and a securing structure.
The magnet array comprises a plurality of annular magnet array units which are sequentially stacked along the axis, and each magnet array unit is suitable for arranging a plurality of magnets along an annular shape.
As shown in fig. 1, a direction parallel to a central axis a of a cylindrical magnet array formed by a plurality of magnets is defined as an axial direction, and an arbitrary direction perpendicular to the central axis a is defined as a radial direction. The magnet array according to the embodiment of the present disclosure includes a plurality of annular magnet array units stacked in an axial direction, that is, an annular magnet array unit that divides the magnet array into pieces in the axial direction, wherein each magnet array unit is configured to be assembled with a ring of magnets, so that the plurality of magnet array units are sequentially stacked to form a plurality of magnets into a cylindrical structure as shown in fig. 1.
The support frame refers to a fixing support of the MRI system, and in the embodiment of the present disclosure, the magnet array is fixedly assembled on the support frame through a fixing structure, so as to realize the positioning and assembling of a plurality of magnets as shown in fig. 1. The detailed structure and connection manner of the supporting frame and the fixing structure are explained in the following embodiments of the disclosure, and detailed description is omitted here.
In the embodiment of the disclosure, the complex permanent magnet array is positioned and assembled by using a plurality of annular magnet array units, and the assembled magnet array is fixed on a support frame of the MRI system by a fixing structure. The magnet assembly component of the embodiment of the disclosure is used as a fixing and positioning device of a complex permanent magnet, has a simple structure and a simple and convenient assembly process, is used as a necessary installation structure of an MRI system, does not need to be repeatedly disassembled and assembled after the permanent magnet is fixedly installed, and ensures the reliability of the system to the maximum extent. In addition, in the embodiment of the disclosure, the permanent magnet is not required to be assembled by using an iron yoke, so that the volume and the weight of the MRI system can be reduced, and the miniaturization and the movement portability of the MRI system are favorably realized.
Fig. 2 to 8 illustrate the structure of a magnet assembly according to some embodiments of the present disclosure, and will be described with reference to fig. 2 to 8.
As shown in fig. 2, in some embodiments, the magnet assembly of the examples of the present disclosure includes a magnet array 100 and a support bracket 200, the magnet array 100 being fixedly mounted above the support bracket 200.
The support frame 200 is a fixing bracket for fixing a magnet array on the MRI system, for example, as shown in fig. 2, the bottom of the support frame 200 is fixedly assembled with a frame of the MRI system, the magnet array 100 is fixedly assembled above the support frame 200 through a fixing structure, and the middle of the cylindrical structure of the magnet array 100 is used as a main magnetic field region of the MRI system for placing a living body or other objects to realize MRI detection.
As shown in fig. 3, in some embodiments, the support stand 200 includes a bottom plate 210, and the bottom plate 210 is a main bearing structure of the support stand 200, and an upper surface thereof is used for bearing the magnet array 100. On both sides of the bottom plate 210, there are positioning brackets 240, in this example, the positioning brackets 240 are two sets of grid plate structures uniformly arranged, which on one hand can reduce the weight of the supporting frame 200 and on the other hand can facilitate the assembly of the magnet array 100.
With continued reference to fig. 3, the bottom plate 210 and the positioning brackets 240 on both sides form an arc-shaped receiving groove, and the arc-shaped receiving groove is matched with the cylindrical size of the magnet array 100, so that the magnet array 100 can be disposed in the arc-shaped receiving groove.
It can be understood that when the fixing structure is used to fix the magnet array 100 and the support frame 200, the magnet array 100 needs to be limited in multiple dimensions, for example, in the embodiment of the present disclosure, the fixing structure may limit the axial direction, the horizontal direction, and the vertical direction of the magnet array 100, so as to achieve the fixed assembly of the magnet array 100 and the support frame 200.
For the axial position limitation of the magnet array 100, the fixing structure includes fixing blocks 230 respectively fixed at the two axial ends of the supporting frame 200. For example, as shown in fig. 2 and 3, two fixing blocks 230 are respectively disposed at two ends of the bottom plate 210 in the circumferential direction, and the height of the fixing blocks 230 in the vertical direction exceeds the upper surface of the bottom plate 210.
As shown in fig. 2, when the magnet array 100 is assembled with the supporting frame 200, the fixing blocks 230 at two axial ends respectively abut against two axial end surfaces of the magnet array 100, so that the fixing blocks 230 can axially limit the magnet array 100, that is, the magnet array 100 cannot move in the axial direction.
For the horizontal position limitation of the magnet array 100, the fixing structure may include at least two bottom pins 220 axially disposed on the bottom plate 210 in parallel and at least two slots 111 axially disposed on the outer surface of the magnet array.
As shown in fig. 4 to 6, in the present example, one magnet array unit 110 is explained as an example. Two bottom pin shafts 220 are arranged above the bottom plate 210, and the bottom pin shafts 220 are arranged in parallel along the axial direction. In one example, the bottom pin 220 is a cylindrical pin structure.
In the embodiment of the present disclosure, at least two card slots 111 are opened on an outer surface of each magnet array unit 110. For example, as shown in fig. 6, in one example, the magnet array unit 110 is provided with two slots 111, each slot 111 is a right-angle slot, and when the magnet array unit 110 is assembled with the support bracket 200, the two slots 111 on the magnet array unit 110 are connected with the two bottom pins 220 on the bottom plate 210 in a snap-fit manner. It can be understood that the cylindrical bottom pins 220 are respectively abutted against two wall surfaces of the slot 111, so that the two bottom pins 220 realize the horizontal position limitation of the magnet array unit 110, that is, the magnet array unit 110 cannot move in the horizontal direction.
It is understood that the above description is only made for the horizontal position limiting manner of one of the magnet array units 110 in the magnet array 100, and the horizontal position limiting of the entire magnet array 100 can be achieved by stacking and assembling all the magnet array units 110 in the magnet array 100 according to the above process in sequence. It will be understood by those skilled in the art that the present disclosure is not repeated in detail.
For vertical spacing of the magnet array 100, the fixing structure may include a first semicircular groove 260 disposed on the positioning bracket 240, a second semicircular groove 112 disposed on the magnet array, and a side pin 250.
As shown in fig. 4, in one example, a first semicircular groove 260 is formed at an end of the positioning bracket 240 in an arc shape along the axial direction, and a second semicircular groove 112 is formed at a position corresponding to the outer surface of the magnet array unit 110. As shown in fig. 5, when the magnet array unit 110 is assembled with the support bracket 200, the second semicircular groove 112 of the magnet array unit 110 and the first semicircular groove 260 of the positioning bracket 240 are combined to form a complete circular groove 300.
As shown in fig. 7, the two side pins 250 respectively penetrate through the circular groove 300, and after the side pins 250 are inserted into the circular groove 300, the side pins 250 are simultaneously abutted to the first semicircular groove 260 on the positioning bracket 240 and the second semicircular groove 112 on the outer surface of the magnet array unit 110, so that a pin joint effect is achieved, and the vertical position limitation of the magnet array unit 110 is achieved, that is, the magnet array unit 110 cannot move in the vertical direction.
It is understood that the above description is only made for the vertical position limitation manner of one of the magnet array units 110 in the magnet array 100, and the horizontal position limitation of the entire magnet array 100 can be achieved by sequentially stacking and assembling all the magnet array units 110 in the magnet array 100 according to the above process. It will be understood by those skilled in the art that the present disclosure is not described in detail.
In the embodiment of the present disclosure, the fixing structures are used to limit the magnet array 100 and the support frame 200 in the axial direction, the horizontal direction and the vertical direction, respectively, so as to fix and assemble the magnet array 100 and the support frame 200.
Of course, those skilled in the art will understand that the specific implementation of the above-mentioned fixing structure is merely an example of the embodiment of the present disclosure, and the present disclosure is not limited thereto, and on the basis of the above-mentioned example, those skilled in the art may certainly implement other implemented fixing assemblies. For example, side round pin axle and bottom round pin axle are not restricted to cylindrically, can also be the cuboid, and it can to correspond simultaneously to change the draw-in groove shape, and this disclosure is no longer repeated here.
In some embodiments, in the magnet assembly kit of examples of the present disclosure, the magnet array 100 includes a plurality of magnet array units 110, wherein in each magnet array unit, the plurality of magnets are arranged in a Halbach (Halbach) in a circumferential direction of the magnet array unit.
As shown in fig. 8, a plurality of magnets are fixedly provided in the circumferential direction for any one of the magnet array units 110. In one example, the magnet may be a rare earth permanent magnet, such as a neodymium iron boron permanent magnet. Also, in the disclosed example, the plurality of magnets are in a halbach arrangement.
Halbach magnet arrays are an engineered, near-ideal magnet structure that produces the strongest magnetic field with the least amount of magnet possible by a halbach arrangement. Specifically, for each magnet array unit 110, the magnetization direction may be changed by adjusting the magnet fixing position so that the plurality of magnets exhibit a halbach arrangement on the magnet array unit 110.
It will be appreciated that the particular manner of arranging the halbach array will no doubt be understood and fully carried out by those skilled in the art with reference to the relevant art, and will not be described in any further detail in this disclosure.
In addition, it is worth mentioning that the magnet assembly according to the embodiment of the present disclosure implements a cylindrical magnetic field of a complex permanent magnet array using a plurality of magnet array units, so that the magnet assembly does not need to use an iron yoke. That is, in some embodiments, the magnet array 100 and the support frame 200 may be made of non-ferrous materials, such as aluminum alloy, engineering plastics, and the like, so as to greatly reduce the weight of the assembled components, reduce the overall volume and weight of the MRI system, and facilitate the miniaturization and portability of the MRI system.
For example, the weight of the MRI system for detecting a human body in the related art can often reach several tons or even ten and several tons, and the position movement is difficult to realize.
Therefore, in the embodiment of the disclosure, the magnet assembly of the MRI system is realized by using the magnet assembly component, the whole machine has a simple structure, the assembly process is simple and convenient, repeated disassembly and assembly are not needed, and the reliability of the system is ensured to the maximum extent. In addition, in the embodiment of the disclosure, the permanent magnet is not required to be assembled by using an iron yoke, so that the volume and the weight of the MRI system can be reduced, and the miniaturization and the movement portability of the MRI system are favorably realized.
In a second aspect, embodiments of the present disclosure provide a magnetic resonance apparatus comprising a magnet mounting assembly of any of the above embodiments, and a plurality of magnets provided in the magnet mounting assembly.
As will be understood by those skilled in the art, the structure of the magnetic resonance apparatus and the assembly manner of the magnet can be fully implemented by referring to the foregoing embodiments, and the details of the present disclosure are not repeated.
Therefore, in the embodiment of the disclosure, the magnet assembly of the MRI system is realized by using the magnet assembly component, the whole machine has a simple structure, the assembly process is simple and convenient, repeated disassembly and assembly are not needed, and the reliability of the system is ensured to the maximum extent. In addition, in the embodiment of the disclosure, the permanent magnet is not required to be assembled by using an iron yoke, so that the volume and the weight of the MRI system can be reduced, and the miniaturization and the movement portability of the MRI system are favorably realized.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications of the present disclosure may be made without departing from the scope of the present disclosure.
Claims (10)
1. A magnet mounting assembly, comprising:
the magnetic array comprises a plurality of annular magnetic array units which are sequentially stacked along the axial direction, and a plurality of magnets are arranged on each magnetic array unit along an annular shape;
the upper part of the support frame is suitable for bearing the magnet array; and (c) a second step of,
and the fixing structure is used for fixedly assembling the magnet array and the support frame.
2. The magnet mounting assembly of claim 1,
the fixing structure comprises fixing blocks fixedly arranged at two ends of the support frame respectively, and the fixing blocks are abutted to two axial end faces of the magnet array so as to axially limit the magnet array.
3. The magnet mounting assembly of claim 1 or 2,
the support frame comprises a bottom plate, and the magnet array is suitable to be carried above the bottom plate; the fixing structure comprises at least two bottom pin shafts which are arranged on the bottom plate in parallel along the axial direction, and at least two clamping grooves which are arranged on the outer surface of the magnet array along the axial direction;
when the magnet array is assembled with the support frame, the bottom pin shaft is clamped and connected with the clamping groove to radially limit the magnet array.
4. The magnet mounting assembly of claim 3,
the bottom pin shaft is a cylindrical pin shaft, the clamping groove is a right-angle clamping groove formed in the surface of the magnet array, and the circumferential surface of the cylindrical pin shaft is abutted to two wall surfaces of the right-angle clamping groove when the magnet array is assembled with the supporting frame.
5. The magnet mounting assembly of claim 3,
the support frame is characterized by further comprising positioning supports arranged on two sides of the bottom plate, the positioning supports and the bottom plate form arc-shaped accommodating grooves, and the magnet array is arranged in the accommodating grooves.
6. The magnet mounting assembly of claim 5,
fixed knot constructs still including offering in first semicircular groove on the locating support, offering in second semicircular groove and side round pin axle on the magnet array with during the support frame assembly, first semicircular groove with complete whole circular slot is constituteed to the second semicircular groove, side round pin axle runs through and locates in the whole circular slot.
7. The magnet mounting assembly of claim 6,
the first semicircular groove is formed in the position of the arc-shaped end part of the positioning support along the axial direction, and the second semicircular groove is formed in the position, corresponding to the first semicircular groove, of the magnet array along the axial direction.
8. The magnet mounting assembly of claim 1,
at least one of the magnet array and the support frame is made of nonferrous materials.
9. A magnetic resonance apparatus, characterized by comprising:
the magnet mounting assembly of any one of claims 1 to 8; and
a plurality of magnets provided in the magnet array unit.
10. The magnetic resonance apparatus according to claim 9,
for each magnet array unit, a plurality of magnets are arranged in a halbach arrangement in a ring direction of the magnet array unit.
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| CN202220714924.8U CN217332811U (en) | 2022-03-29 | 2022-03-29 | Magnet assembly and magnetic resonance equipment |
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