CN113702884A - Medical imaging equipment - Google Patents
Medical imaging equipment Download PDFInfo
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- CN113702884A CN113702884A CN202110991147.1A CN202110991147A CN113702884A CN 113702884 A CN113702884 A CN 113702884A CN 202110991147 A CN202110991147 A CN 202110991147A CN 113702884 A CN113702884 A CN 113702884A
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- shim
- assembly
- gradient coil
- medical imaging
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- 238000002059 diagnostic imaging Methods 0.000 title claims abstract description 36
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 13
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 19
- 238000003384 imaging method Methods 0.000 abstract description 16
- 230000005284 excitation Effects 0.000 abstract description 9
- 238000000605 extraction Methods 0.000 abstract description 6
- 238000003780 insertion Methods 0.000 abstract description 5
- 230000037431 insertion Effects 0.000 abstract description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000002595 magnetic resonance imaging Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
Abstract
The invention relates to the technical field of medical imaging, in particular to medical imaging equipment. The medical imaging device comprises a main magnet, a gradient coil, a shimming assembly and an elastic piece, wherein the main magnet is provided with mounting holes penetrating through two ends of the main magnet, the gradient coil is mounted in the mounting holes, the gradient coil is provided with shimming holes extending along the axial direction of the gradient coil, and the shimming assembly is mounted in the shimming holes; the elastic piece is positioned at the end part of the shimming assembly, and at least one end of the shimming assembly is pressed in the shimming hole through the elastic piece. The invention has the advantages that: on one hand, the shimming assembly can be tightly attached to the inner wall of the shimming hole by the resilience force of the elastic piece, so that the installation gap between the shimming assembly and the shimming hole is reduced, the shimming assembly is prevented from generating excitation vibration in the shimming hole, and the imaging quality is improved; on the other hand, the arrangement of the elastic piece enables the operation to be simple and convenient, the insertion and the extraction of the shimming assembly to be convenient, and the shimming assembly can be stably fixed.
Description
Technical Field
The invention relates to the technical field of medical imaging, in particular to medical imaging equipment.
Background
Magnetic resonance imaging is a medical imaging technique that utilizes the phenomenon of magnetic resonance for imaging. The basic principle is that after the measured object is placed in a special magnetic field, the hydrogen atom in the body can be polarized, the radio frequency pulse is used to excite the hydrogen atom nucleus in the human body to cause the hydrogen atom nucleus to resonate and absorb energy, after the radio frequency pulse is stopped, the hydrogen atom nucleus sends out radio signals according to a specific frequency and releases the absorbed energy, the radio signals are received by a receiver outside the body, and the radio signals are converted and processed by a computer, so that an image is obtained.
The medical imaging device comprises a main magnet, a gradient coil and a shimming assembly, wherein the main magnet is used for generating a uniform magnetic field; the gradient coil is positioned in the main magnet aperture and used for generating a gradient magnetic field which is linearly distributed in space; the shimming assembly is arranged in a shimming hole of the gradient coil; during scanning, the gradient coil is electrified with changed current, and can generate violent vibration under the action of changed Lorentz force; the vibration of the gradient coil can cause the shimming assembly arranged in the shimming hole to vibrate at high frequency and low displacement, thereby affecting the imaging quality and causing the structure of the shimming strip to be damaged in severe cases.
At least one end of the shimming assembly is connected with the gradient coil through a screw, but the shimming assembly still vibrates at high frequency and low displacement in a shimming hole, so that the imaging quality is influenced.
Disclosure of Invention
In view of the above, there is a need for a medical imaging apparatus with simple structure, easy installation and high imaging quality.
In order to solve the technical problem, the application provides the following technical scheme:
a medical imaging device, the medical imaging device comprising:
the main magnet is provided with mounting holes penetrating through two ends of the main magnet;
the gradient coil is arranged in the mounting hole and is provided with a shimming hole extending along the axis direction of the gradient coil;
the shimming assembly is arranged in the shimming hole;
the medical imaging apparatus further includes:
and the elastic piece is positioned at the end part of the shimming assembly, and at least one end of the shimming assembly is pressed in the shimming hole through the elastic piece.
In the application, because the installation of the shimming assembly and the shimming hole belongs to transition fit installation, a certain gap exists, and the shimming assembly can vibrate at a high frequency and a low displacement in the shimming hole in the vibration process of the gradient coil; by arranging the elastic piece, on one hand, the shimming assembly can be tightly attached to the inner wall of the shimming hole by the resilience force of the elastic piece, so that the installation gap between the shimming assembly and the shimming hole is reduced, the shimming assembly is prevented from generating excitation vibration in the shimming hole, and the imaging quality is improved; on the other hand, the arrangement of the elastic piece enables the operation to be simple and convenient, the insertion and the extraction of the shimming assembly to be convenient, and the shimming assembly can be stably fixed.
In one embodiment, the elastic piece is provided with a connecting part and a mounting part, and one end of the mounting part can extend into the shimming hole and is abutted against one end of the shimming assembly; the other end of the mounting part is connected with the connecting part; the connection portion is connected to the gradient coil.
According to the arrangement, the shimming assembly is compressed by the resilience force of the compressed mounting part; through the connection of the connecting part and the gradient coil, the elastic part is fixed on the gradient coil, so that the structure is more compact and stable.
In one embodiment, the end part of the gradient coil corresponding to the elastic piece is provided with a mounting groove, and the shimming holes are positioned on the bottom surface of the mounting groove; and the connecting part is accommodated in the mounting groove along with the extension of the mounting part into the shimming hole and abuts against the bottom surface of the mounting groove.
By the arrangement, on one hand, the distance of the elastic piece extending into the shimming hole can be limited, so that the mounting part and the shimming assembly are in proper abutting fit; on the other hand, the mounting groove can bear and hold connecting portion, and the elastic component's of being convenient for is inserted and is extracted to can improve pleasing to the eye degree.
In one embodiment, the medical imaging device further comprises a fastening piece, one end of the shimming assembly is connected with the gradient coil through the fastening piece, and the other end of the shimming assembly is pressed in the shimming hole through the elastic piece.
By the arrangement, the shimming assembly is firmly installed, the installation gap between the shimming assembly and the shimming hole can be reduced, excitation vibration of the shimming assembly in the shimming hole is avoided, and the imaging quality is improved.
In one embodiment, the shim assembly comprises:
one end of each main shimming strip is connected with the gradient coil through the fastening piece, and a first matching part is formed at the other end of each main shimming strip and is in butt fit with the mounting part;
one end of each secondary shimming strip is connected with the gradient coil through the fastener, a second matching part is formed at the other end of each secondary shimming strip, and the second matching parts are in butt fit with the mounting parts.
By the arrangement, the main shimming strips and the secondary shimming strips are more firmly installed, installation gaps among the main shimming strips, the secondary shimming strips and the shimming holes can be reduced, excitation vibration of the main shimming strips and the secondary shimming strips in the shimming holes is avoided, and imaging quality is improved.
In one embodiment, one end of the mounting part, which is far away from the connecting part, is provided with a plurality of abutting grooves; the first matching portion and the second matching portion are respectively abutted to the corresponding abutting grooves, and the outer wall of the first matching portion and the outer wall of the second matching portion are respectively attached to the corresponding inner walls of the abutting grooves.
Due to the arrangement, the abutting grooves are convenient for mounting the main shimming strips and the secondary shimming strips on one hand, and can separate the main shimming strips and the secondary shimming strips on the other hand, so that the main shimming strips and the secondary shimming strips cannot influence each other; in addition, the outer wall of the first matching part and the outer wall of the second matching part are respectively attached to the inner walls of the corresponding abutting grooves, so that the structure is more compact, and the gaps between the main shimming strips and the secondary shimming strips and the shimming holes are reduced.
In one embodiment, the circumferential surface of the abutting groove is an inclined surface, and the circumferential surface of the first matching portion and the circumferential surface of the second matching portion are inclined surfaces.
By the arrangement, the main shimming strips and the secondary shimming strips are convenient to mount and compress, so that the shimming assembly is more compactly and stably mounted in the shimming hole.
In one embodiment, one end of each of the primary shim bar and the secondary shim bar is provided with a protrusion, and when the other end of each of the primary shim bar and the secondary shim bar extends into the shim hole, the protrusion can abut against the end face of the gradient coil and is connected with the gradient coil.
The arrangement is that the bulge is convenient to be connected with the gradient coil on one hand; on the other hand, the main shimming strips and the secondary shimming strips are convenient to insert and extract, the secondary shimming strips can be repeatedly inserted and extracted in the actual shimming process, and the magnetic force (Lorentz force) is generated by operation with the magnetic field, so that the protrusion at one end of the secondary shimming strip can play a good force-borrowing role, and the secondary shimming strip is convenient to extract.
In one embodiment, the number of the shimming assemblies is multiple groups; the tip of gradient coil is equipped with a plurality of reinforcing platforms, and is a plurality of reinforcing platform is followed gradient coil's circumference interval distribution, adjacent two install a set of between the reinforcing platform shimming subassembly.
So set up, strengthen the reinforcing effect that the platform can play the tip on the one hand, on the other hand can separate multiunit shimming subassembly, places and makes mistakes when main shimming strip and the secondary shimming strip are pulled out in the installation.
In one embodiment, along the length direction of the shimming assembly, a plurality of accommodating grooves for accommodating shimming pieces are respectively formed in the main shimming strip and the secondary shimming strip; fixing ribs are arranged in the accommodating grooves and can limit the shimming pieces; the shimming assembly is provided with a plurality of cover plates, and the cover plates are respectively covered on the corresponding accommodating grooves.
So set up, fixed muscle is used for restricting the parallel translation of shimming piece, can compress tightly the shimming piece after covering the apron.
In one embodiment, the elastic member includes any one of a rubber block, a silicone block, or a non-magnetic spring.
By the arrangement, on one hand, the shimming assembly can be tightly attached to the inner wall of the shimming hole due to the resilience force, so that the installation gap between the shimming assembly and the shimming hole is reduced, the shimming assembly is prevented from generating excitation vibration in the shimming hole, and the imaging quality is improved; on the other hand, the elastic part is made of nonmagnetic materials, so that the safety is higher, and the imaging quality is not influenced.
Compared with the prior art, the medical imaging equipment provided by the application has the advantages that the elastic piece is arranged, on one hand, the shimming assembly can be tightly attached to the inner wall of the shimming hole due to the resilience force of the elastic piece, so that the installation gap between the shimming assembly and the shimming hole is reduced, the shimming assembly is prevented from generating excitation vibration in the shimming hole, and the imaging quality is improved; on the other hand, the arrangement of the elastic piece enables the operation to be simple and convenient, the insertion and the extraction of the shimming assembly to be convenient, and the shimming assembly can be stably fixed.
Drawings
Fig. 1 is a schematic view of a medical imaging apparatus according to the present disclosure;
fig. 2 is a schematic structural view of another view angle of the medical imaging apparatus provided in the present application;
fig. 3 is a partial schematic view of a front view of a medical imaging apparatus provided herein;
FIG. 4 is a schematic structural view of the elastic member provided in the present application;
fig. 5 is a schematic structural diagram of a main shim bar provided in the present application;
FIG. 6 is an enlarged view of a portion of FIG. 5 at A;
FIG. 7 is a schematic diagram of a secondary shim bar arrangement according to the present application;
fig. 8 is a partial enlarged view of fig. 7 at B.
In the figure, 100, a medical imaging device; 10. a main magnet; 11. mounting holes; 20. a gradient coil; 21. shimming holes; 22. mounting grooves; 23. a bottom surface; 24. connecting holes; 30. a shimming assembly; 31. a primary shim bar; 311. a first mating portion; 32. secondary shim bars; 321. a second mating portion; 33. a protrusion; 34. accommodating grooves; 35. a notch; 36. fixing the ribs; 37. a cover plate; 371. an observation hole; 40. an elastic member; 41. a connecting portion; 42. an installation part; 421. a butt joint groove; 4211. a peripheral surface; 4212. a bottom surface; 50. a fastener; 60. and (4) a reinforcing platform.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present application provides a medical imaging apparatus 100 capable of utilizing magnetic resonance imaging. The basic principle is that after the measured object is placed in a special magnetic field, the hydrogen atom in the body can be polarized, the radio frequency pulse is used to excite the hydrogen atom nucleus in the human body to cause the hydrogen atom nucleus to resonate and absorb energy, after the radio frequency pulse is stopped, the hydrogen atom nucleus sends out radio signals according to a specific frequency and releases the absorbed energy to be received by a receiver outside the body, and then the image is obtained through processing.
It should be noted that the medical imaging apparatus 100 provided in the present application mainly refers to a magnetic resonance imaging apparatus.
Referring to fig. 1 to 3, a medical imaging apparatus 100 provided by the present application includes a main magnet 10, a gradient coil 20, a shim assembly 30 and an elastic member 40, wherein the main magnet 10 is provided with mounting holes 11 penetrating through two ends of the main magnet, the gradient coil 20 is mounted in the mounting holes 11, the gradient coil 20 is provided with shim holes 21 extending along an axial direction of the gradient coil, and the shim assembly 30 is mounted in the shim holes 21; the resilient members 40 are located at the ends of the shim assemblies 30, and at least one end of the shim assembly 30 is compressed within the shim bore 21 by the resilient members 40.
Because the shimming assemblies 30 and the shimming holes 21 are installed in a transition fit mode, a certain gap exists, and the shimming assemblies 30 vibrate at a high frequency and a low displacement in the shimming holes 21 in the vibration process of the gradient coil 20. By arranging the elastic piece 40, on one hand, the shimming assembly 30 can be tightly attached to the inner wall of the shimming hole 21 by the resilience force of the elastic piece 40, so that the installation gap between the shimming assembly 30 and the shimming hole 21 is reduced, the shimming assembly 30 is prevented from generating excitation vibration in the shimming hole 21, and the imaging quality is improved; on the other hand, the elastic piece 40 is simple and convenient to operate, facilitates the insertion and extraction of the shimming assembly 30, and can stably fix the shimming assembly 30.
The elastic member 40 includes any one of a non-magnetic spring, a rubber block, or a silicone block. It should be noted that the non-magnetic spring refers to a spring made of a non-magnetic material. The elastic part 40 is made of nonmagnetic materials, so that the safety is higher, and the imaging quality is not influenced. Moreover, the elastic member 40 can enable the shim assembly 30 to be tightly attached to the inner wall of the shim hole 21, so that the installation gap between the shim assembly 30 and the shim hole 21 is reduced, excitation vibration of the shim assembly 30 in the shim hole 21 is avoided, and the imaging quality is improved.
Preferably, the elastic member 40 in the present application is a rubber block; the rubber block has good damping effect, is beneficial to damping high-frequency vibration and is easy to maintain.
Referring to fig. 1, the medical imaging apparatus 100 further includes a fastening member 50, the gradient coil 20 is provided with a connecting hole 24, one end of the shim assembly 30 is connected to the connecting hole 24 of the gradient coil 20 through the fastening member 50, and the other end is pressed in the shim hole 21 through the elastic member 40; the shimming assembly 30 is firmly installed, and the installation and the disassembly of the shimming assembly 30 are convenient; meanwhile, the installation gap between the shimming assembly 30 and the shimming hole 21 can be reduced, and the imaging quality is improved.
Referring to fig. 4, the elastic member 40 has a connecting portion 41 and a mounting portion 42, and one end of the mounting portion 42 can extend into the shim hole 21 and abut against one end of the shim assembly 30; the other end of the mounting portion 42 is connected to the connecting portion 41; the connection 41 is connected to the gradient coil 20. In this way, the shim assembly 30 can be compressed by the resilience force after compression of the mounting portion 42; the connection of the connection portion 41 to the gradient coil 20 can fix the elastic member 40 to the gradient coil 20, thereby making the structure more compact and stable.
Referring to fig. 2, the end of the gradient coil 20 corresponding to the elastic member 40 is provided with a mounting groove 22, and the shim holes 21 are located on the bottom surface 23 of the mounting groove 22; the mounting portion 42 extends into the shim hole 21, the connecting portion 41 is accommodated in the mounting groove 22 and abuts against the bottom surface 23 of the mounting groove 22, and the connecting portion 41 is connected to the bottom surface 23 of the mounting groove 22. The installation groove 22 can limit the distance of the elastic piece 40 extending into the shimming hole 21, so that the installation part 42 is in proper abutting fit with the shimming assembly 30; on the other hand, the mounting groove 22 can support and accommodate the connecting part 41, so as to facilitate the insertion and extraction of the elastic element 40; further, the connection portion 41 is housed in the mounting groove 22, so that the appearance can be improved.
Referring to fig. 1, 6 and 8, the shim assembly 30 includes a main shim strip 31 and a sub shim strip 32, one end of the main shim strip 31 is connected to the gradient coil 20 through a fastener 50, the other end of the main shim strip 31 is formed with a first matching portion 311, and the first matching portion 311 is in abutting fit with the mounting portion 42; one end of the sub-shim bar 32 is connected to the gradient coil 20 by a fastener 50, and a second fitting portion 321 is formed at the other end of the sub-shim bar 32, and the second fitting portion 321 is in abutting engagement with the mounting portion 42. In this way, the main shim strips 31 and the sub shim strips 32 can be more firmly mounted to the elastic member 40, the mounting gaps between the main shim strips 31 and the sub shim strips 32 and the shim holes 21 can be reduced, and excitation vibration of the main shim strips 31 and the sub shim strips 32 in the shim holes 21 can be prevented, thereby improving the imaging quality.
Further, referring to fig. 4, one end of the mounting portion 42 away from the connecting portion 41 is provided with a plurality of abutting grooves 421; the first engaging portion 311 and the second engaging portion 321 respectively abut against the corresponding abutting grooves 421, and the outer wall of the first engaging portion 311 and the outer wall of the second engaging portion 321 respectively abut against the inner walls of the corresponding abutting grooves 421. The inner wall of the contact groove 421 refers to all the surfaces of the contact groove 421.
The abutting slots 421 are arranged to facilitate the installation of the primary shim bars 31 and the secondary shim bars 32; on the other hand, the primary shim strips 31 and the secondary shim strips 32 can be separated from each other so that they do not affect each other. Further, the outer walls of the first and second engagement portions 311 and 321 are respectively brought into contact with the inner walls of the corresponding contact grooves 421, so that the structure can be made more compact, and the gaps between the main and sub shim bars 31 and 32 and the shim holes 21 can be reduced.
Specifically, referring to fig. 4, 6 and 8, the circumferential surface 4211 of the abutting groove 421 is an inclined surface, and the circumferential surfaces of the first engaging portion 311 and the second engaging portion 321 are inclined surfaces. The circumferential surface 4211 of the contact groove 421 refers to any surface of the inner wall of the contact groove 421 excluding the bottom surface 4212, and is the circumferential surface 4211 of the contact groove 421. The inclined planes are arranged to facilitate the installation and the compression of the main shimming strips 31 and the secondary shimming strips 32, so that the shimming assembly 30 is more compactly and stably installed in the shimming holes 21, and the gaps between the main shimming strips 31 and the secondary shimming strips 32 and the shimming holes 21 are reduced.
In the present application, the shim assembly 30 comprises one primary shim bar 31 and two secondary shim bars 32; the number of the abutting slots 421 in the mounting portion 42 is adapted to the total number of the main shim 31 and the sub shim 32, that is, three abutting slots 421 are provided, and the main shim 31 is positioned between the two sub shim 32 when mounted. Of course, in other embodiments, the number of primary and secondary shims 31, 32 within the shim assembly 30 may be varied according to actual requirements, and the number of abutting slots 421 may be varied accordingly.
Referring to fig. 5 and 7, the main shim strips 31 and the sub shim strips 32 are provided with protrusions 33 at one ends thereof, and when the other ends of the main shim strips 31 and the sub shim strips 32 extend into the shim holes 21, the protrusions 33 can abut against the end faces of the gradient coil 20 and are connected to the gradient coil 20. The projections 33 are provided, on the one hand, to facilitate connection to the gradient coil 20; on the other hand, the main shimming strips 31 and the secondary shimming strips 32 are convenient to insert and extract, and the secondary shimming strips 32 can be repeatedly inserted and extracted in the actual shimming process, and the magnetic force (Lorentz force) can be generated by operating with the magnetic field, so that the protrusions 33 at one ends of the secondary shimming strips 32 can play a good force-borrowing role, and the extraction is convenient.
Referring to fig. 1, in the present application, the number of shim assemblies 30 is multiple; the end of the gradient coil 20 is provided with a plurality of reinforcing platforms 60, the plurality of reinforcing platforms 60 are distributed at intervals along the circumference of the gradient coil 20, and a group of shimming assemblies 30 are arranged between two adjacent reinforcing platforms 60. The reinforcing table 60 can play a role in reinforcing the end part, and can separate a plurality of groups of shimming assemblies 30, so that errors can be made when the main shimming strips 31 and the secondary shimming strips 32 are installed and unplugged.
Referring to fig. 5 and 7, along the length direction of the shim assembly 30, the main shim strips 31 and the sub shim strips 32 are respectively provided with a plurality of accommodating grooves 34 for accommodating shim pieces (not shown); the fixing ribs 36 are arranged in the accommodating grooves 34, and the fixing ribs 36 can limit the shimming pieces and limit the parallel movement of the shimming pieces. The shim assembly 30 includes a plurality of cover plates 37, each of the plurality of cover plates 37 is fitted in a corresponding one of the receiving grooves 34, and the shim pieces can be pressed by fitting the cover plates 37.
Referring to fig. 6, the cover plate 37 is provided with an observation hole 371, which is convenient for observing whether the shimming piece is placed or not; on the other hand, the operation is convenient, and the cover plate 37 is convenient to take out.
Referring to fig. 8, the outer wall of the receiving groove 34 is provided with a notch 35 to facilitate the taking of the cover plate 37.
In the present application, the observation hole 371 is opened in the cover plate 37 of the primary shim strip 31, and the notch 35 is provided in the outer wall of the receiving groove 34 of the secondary shim strip 32, according to actual requirements.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The features of the above embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be construed as being within the scope of the present specification as long as there is no contradiction between the combinations of the features.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
Claims (11)
1. A medical imaging device, the medical imaging device comprising:
the main magnet is provided with mounting holes penetrating through two ends of the main magnet;
the gradient coil is arranged in the mounting hole and is provided with a shimming hole extending along the axis direction of the gradient coil;
the shimming assembly is arranged in the shimming hole;
characterized in that, the medical imaging equipment still includes:
and the elastic piece is positioned at the end part of the shimming assembly, and at least one end of the shimming assembly is pressed in the shimming hole through the elastic piece.
2. The medical imaging device of claim 1, wherein the resilient member has a connecting portion and a mounting portion, one end of the mounting portion being capable of extending into the shim hole and abutting one end of the shim assembly; the other end of the mounting part is connected with the connecting part; the connection portion is connected to the gradient coil.
3. The medical imaging device of claim 2, wherein an end of the gradient coil corresponding to the elastic member is provided with a mounting groove, and the shimming holes are located on a bottom surface of the mounting groove; the mounting part extends into the shimming hole, and the connecting part is accommodated in the mounting groove and abuts against the bottom surface of the mounting groove.
4. The medical imaging device of claim 3, further comprising a fastener, wherein one end of the shim assembly is connected to the gradient coil through the fastener, and the other end of the shim assembly is compressed in the shim hole through the elastic member.
5. The medical imaging device of claim 4, wherein the shim assembly comprises:
one end of each main shimming strip is connected with the gradient coil through the fastening piece, and a first matching part is formed at the other end of each main shimming strip and is in butt fit with the mounting part;
one end of each secondary shimming strip is connected with the gradient coil through the fastener, a second matching part is formed at the other end of each secondary shimming strip, and the second matching parts are in butt fit with the mounting parts.
6. The medical imaging device of claim 5, wherein the mounting portion has a plurality of abutting grooves at an end thereof remote from the connecting portion; the first matching portion and the second matching portion are respectively abutted to the corresponding abutting grooves, and the outer wall of the first matching portion and the outer wall of the second matching portion are respectively attached to the corresponding inner walls of the abutting grooves.
7. The medical imaging device of claim 6, wherein the circumferential surface of the abutting groove is a slope, and the circumferential surface of the first engaging portion and the circumferential surface of the second engaging portion are slopes.
8. The medical imaging device of claim 5, wherein one end of each of the primary shim bar and the secondary shim bar is provided with a protrusion, and when the other end of each of the primary shim bar and the secondary shim bar extends into the shim hole, the protrusion can abut against an end face of the gradient coil and is connected with the gradient coil.
9. The medical imaging device of claim 1, wherein the number of shim assemblies is a plurality of groups; the tip of gradient coil is equipped with a plurality of reinforcing platforms, and is a plurality of reinforcing platform is followed gradient coil's circumference interval distribution, adjacent two install a set of between the reinforcing platform shimming subassembly.
10. The medical imaging device according to claim 5, wherein along the length direction of the shim assembly, the main shim bar and the sub shim bar are respectively provided with a plurality of accommodating grooves for accommodating shim pieces; fixing ribs are arranged in the accommodating grooves and can limit the shimming pieces; the shimming assembly is provided with a plurality of cover plates, and the cover plates are respectively covered on the corresponding accommodating grooves.
11. The medical imaging device of claim 1, wherein the elastic member comprises any one of a rubber block, a silicone block, or a non-magnetic spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110991147.1A CN113702884A (en) | 2021-08-26 | 2021-08-26 | Medical imaging equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110991147.1A CN113702884A (en) | 2021-08-26 | 2021-08-26 | Medical imaging equipment |
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Cited By (1)
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| CN114200366A (en) * | 2021-12-16 | 2022-03-18 | 武汉联影生命科学仪器有限公司 | Shimming device, magnetic field assembly, magnetic resonance imaging system and shimming method |
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