CN205404780U - A magnet subassembly for magnetic resonance imaging - Google Patents
A magnet subassembly for magnetic resonance imaging Download PDFInfo
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- CN205404780U CN205404780U CN201620140322.0U CN201620140322U CN205404780U CN 205404780 U CN205404780 U CN 205404780U CN 201620140322 U CN201620140322 U CN 201620140322U CN 205404780 U CN205404780 U CN 205404780U
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- assembly
- magnet
- gradient coil
- fixed
- push rod
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Abstract
The utility model discloses a magnet subassembly for magnetic resonance imaging, it includes main magnet, gradient coil, main magnet is equipped with along the axially extended chamber of acceping, gradient coil installs and accepts the chamber in main magnet, form annular clearance between gradient coil and the main magnet, the lower part in clearance is provided with the damping layer, the magnet subassembly is still including the radial fixed subassembly that is used for fixed ladder degree coil, radial fixed subassembly is including relative first end that sets up and second end, the first end of radial fixed subassembly supports and leans on on gradient coil, the second end of radial fixed subassembly supports and leans on in main magnet, just length along the radial -adjustable of radial fixed subassembly, the utility model discloses a radial firmware subassembly is fixed in main magnet with gradient coil, and the magnet can not given with the vibration transmission of gradient for flexible fixation to the fixed of radial direction, and radial fixed unit mount with dismantle also comparatively convenient.
Description
[technical field]
This utility model relates to mr imaging technique, is specifically related to a kind of magnet assembly for nuclear magnetic resonance.
[background technology]
Magnetic resonance, also referred to as nuclear magnetic resonance (MagneticResonanceImaging, MRI), spin imaging (spinimaging), NMR (Nuclear Magnetic Resonance)-imaging (NuclearMagneticResonanceImaging, NMRI), it is the another major progress of Medical Imaging after CT.Since the eighties is applied, it is developed at a terrific speed.Its ultimate principle is to be placed in by human body in special magnetic field, and after measurand is placed in magnetic field, its internal hydrogen atom can be polarized.With hydrogen nuclei in radio frequency pulse excitation human body, cause hydrogen nuclei to resonate, and absorb energy.After stopping radio-frequency pulse, hydrogen nuclei sends electric signal by characteristic frequency, and is discharged by the energy of absorption, is included by external receptor, obtains image after electronic computer processes.
The quantity of information that MRI provides is not only more than the many Imagings of other in Medical Imaging, and is different from existing Imaging, and therefore, the diagnosis of disease is had very big potential superiority by it.Owing to it can directly make the body tomographic image on transverse section, sagittal plane, coronalplane and various inclined-plane；And without ionizing radiation, body is not had harmful effect, thus is used more and more at medical domain.
Main magnet is one of key component of magnetic resonance imaging system, is used for producing a uniform magnetic field, and main magnet conventional on the market at present mostly is superconducting magnet, and the magnetic field intensity of its generation is 1.5T or 3.0T.Gradient coil is another vitals of magnetic resonance imaging system, and gradient coils set is made up of three groups of gradient coils, is used for the gradient magnetic producing linearly to be distributed in space.Pass through pulse train, it may be achieved the sequencing contro to gradient magnetic amplitude.The precession frequency of nucleon in imaging region thus can be caused different with the difference of its locus, it is achieved the space encoding to imaging object center subsignal.
As Fig. 1 illustrates known a kind of magnet assembly, including main magnet 1 and gradient coil 2, wherein main magnet 1 and gradient coil 2 are two cylinders, in order to facilitate installing of gradient coil and considering of some other factor, certain space (about 2-5mm) between inner periphery and the gradient coil outer cylinder surface of main magnet, can be reserved.Gradient coil may bear the acceleration of 2g in transportation, causes that gradient coil may deviate default installation site, can cause in imaging time space coding information incorrect.It addition, gradient coil is in running, vibrate more violent, it is necessary to fixing.
[utility model content]
Technical problem to be solved in the utility model is to provide a kind of magnet assembly for nuclear magnetic resonance, and the vibration of the gradient coil of described magnet assembly is suppressed preferably.
This utility model is solve above-mentioned technical problem to the technical scheme is that a kind of magnet assembly for nuclear magnetic resonance, it includes main magnet, gradient coil, described main magnet is provided with the host cavity axially extended, described gradient coil is installed in the host cavity of main magnet, the gap of ring-type is formed between described gradient coil and main magnet, the bottom in described gap is provided with damping layer, it is characterized in that, described magnet assembly also includes the radially fixed assembly for fixing gradient coil, described radially fixed assembly includes the first end and the second end that are oppositely arranged, first end of described radially fixed assembly is resisted against on gradient coil, second end of described radially fixed assembly is resisted against main magnet, and the length of described radially fixed assembly is radially adjustable.
Preferably, the first end of described radially fixed assembly is fixed on gradient coil, and the second end of described radially fixed assembly is resisted against the inwall of the host cavity of main magnet.
Preferably, described radially fixed assembly includes fixed block, push rod, and described fixed block and gradient coil are fixed, and described push rod is provided with screw thread, and described fixed block is provided with screwed hole, and described push rod screws in the screwed hole of fixed block, and described push rod radially extends.
Preferably, described radially fixed assembly also includes screw, and described screw is through the through hole on the protuberance of fixed block and is assembled in gradient coil.
Preferably, described radially fixed assembly also includes the clamp nut being mounted on push rod, and described clamp nut supports and terminates in fixed block.
Preferably, the end that described push rod is relative with fixed block is provided with boss and the second end that described boss and described end are described radially fixed assembly.
Preferably, the end of described gradient coil is provided with notch, and described fixed block has axially projecting portion, and described axially projecting portion is embedded in notch.
Preferably, described magnet assembly also includes axial restraint assembly, described axial restraint assembly includes the first end and the second end that are oppositely arranged, second end of described axial restraint assembly is resisted against on gradient coil, first end of described axial restraint assembly is fixed on main magnet, and the length of described axial restraint assembly is adjustable vertically.
Preferably, described axial restraint assembly includes push rod, the first clamp nut, baffle plate, the second clamp nut, described baffle plate is connected on main magnet, described push rod is provided with screw thread and coordinates with the screwed hole on baffle plate, described first clamp nut and the second clamp nut are assemblied on push rod and are pressed in the two sides of baffle plate, the end of described push rod is provided with boss, and described boss presses on gradient coil.
Preferably, described magnet assembly includes two axial restraint assemblies, is separately positioned on the axial both sides of main magnet.
This utility model contrast prior art has following beneficial effect: gradient coil is fixed on main magnet by radially fastener components and axial restraint assembly by this utility model, and being fixed as of radial direction is flexible fixing, the vibration of gradient will not be passed to magnet；Radial force is born by the projection section of radially fixed part, it is to avoid screw stress fracture occurs or destroys default screw thread；Need not often safeguard, mount and dismount also more convenient.
[accompanying drawing explanation]
Fig. 1 is the structural representation of existing magnet assembly；
Fig. 2 is the three-dimensional structure diagram of the magnet assembly of this utility model embodiment；
Fig. 3 is the front view of magnet assembly；
Fig. 4 is the Fig. 3 profile along A-A direction；
Fig. 5 is the assembling schematic diagram of radially fixed assembly and main magnet, gradient coil；
Fig. 6 is the axonometric chart of radially fixed assembly；
Fig. 7 is the assembling schematic diagram of axial restraint assembly and main magnet, gradient coil.
[detailed description of the invention]
Below in conjunction with drawings and Examples, the utility model will be further described.
As illustrated in figs. 2-7, this utility model includes for the embodiment of magnet assembly of nuclear magnetic resonance: main magnet 1, gradient coil 2 and for fixing radially fixed assembly 30 and the axial restraint assembly 40 of gradient coil.
Main magnet 1 is preferably superconduction type magnet, and it includes bobbin, some superconducting coils of being wound on bobbin and the housing being enclosed in outside.Accommodating cryogenic media in described housing, for instance liquid helium, described superconducting coil is soaked in cryogenic media.Described main magnet 1 substantially becomes cylinder (post) shape, and it has two end faces 102 in the axial direction, and the central area of described main magnet 1 is further provided with that axially extend and between two end faces host cavity.
Gradient coil 2 includes three groups of sub-gradient coils set, it is designated as Gx gradient coil, Gy gradient coil and Gz gradient coil respectively, the gradient direction each produced is mutually orthogonal in space, generally consistent with space coordinates are perpendicular to the magnetic resonance equipment scanning horizontal direction in head of a bed foot direction, vertical and scanning head of a bed foot direction, also consistent with the gradient direction of in pulse train three logic axles.Three groups of sub-gradient coils can isolated operation, it is possible to any two groups of coils run simultaneously, it is possible to three groups of coils run simultaneously, namely by the gradient magnetic of demand synthesis any direction.In gradient coil, often organize sub-gradient coil and there is impedance and inductance, driven by a gradient amplifier respectively.
Three groups of sub-gradient coils of gradient coil 2 are by by resin material or other insulant injection mo(u)lding later monolithic constructions, and it has the structure substantially becoming cylindric, is adapted to be mounted in the host cavity 100 of main magnet 1.The periphery wall of described gradient coil 2 formed by insulant, airtight and airtight.Described gradient coil 2 also has two end faces 201 in the axial direction.
Gradient coil 2 is installed in the host cavity of main magnet 1, and both substantially become coaxially arranged mode to fit together, and forms the gap 101 substantially becoming circular between the two, and described gap 101 axially extends.The bottom in gap 101 is provided with damping layer 13, to reduce the vibration between gradient coil 2 and main magnet 1.Described damping layer 13 can be sponge, expanded material etc..
Further, described radially fixed assembly for applying the active force radially gone up to gradient coil 2, it is achieved its location diametrically.Described radial direction fastener components includes the first end and the second end that are oppositely arranged, and the first end of described radially fixed assembly is resisted against gradient coil 2, and the second end of described radially fixed assembly is resisted against main magnet 1, and the length of described radially fixed assembly is radially adjustable.
Preferably, the first end of described radially fixed assembly is fixed on gradient coil, and the second end of described radially fixed assembly is resisted against the inwall 103 of the host cavity 100 of main magnet 1.
Concrete, described radially fixed assembly 30 includes fixed block 3, screw 4, clamp nut 5, push rod 6, boss 7.Push rod 6 is provided with screw thread.When mounted, the axially projecting portion 31 on fixed block 3 is embedded in notch 21 default on gradient coil.By in the screwed hole screwing in gradient coil 2 after the through hole 311 in the axially projecting portion 31 of screw 4 traverse, tighten.Being screwed in by push rod 6 in the screwed hole on fixed block 3, turn push rod 6 with spanner, until boss 7 holds out against the inwall of magnet host cavity, now radially fixed piece completes to install, and described push rod 6 radially extends.The clamp nut 5 being mounted on push rod 6 supports and terminates in fixed block 3, it is prevented that loosen between push rod 6 and firmware blocks 3.Fixed block 3 is the first end of radially fixed assembly, and boss 7 is fixed on push rod 6 end relative with fixed block 3, to constitute the second end of described radially fixed assembly.
In running, fixed block 3 bears gradient radial vibration power, it is to avoid destroy screw or screwed hole.The installation site of radially fixed assembly and quantity can be calculated according to the vibration of system and traffic condition.Described boss 7 can be assembled in the damping layer of push rod end or other have the material of better damping effect；The vibration that can alleviate or reduce gradient coil is delivered on main magnet 1.
Further, described magnet assembly also includes axial restraint assembly, described axial restraint assembly 40 includes the first end and the second end that are oppositely arranged, first end of described axial restraint assembly is resisted against on gradient coil, second end of described axial restraint assembly is fixed on main magnet, and the length of described axial restraint assembly is adjustable vertically.
Concrete, described axial restraint assembly 40 includes push rod 6, boss the 7, first clamp nut 8, baffle plate the 9, second clamp nut 10, screw 11, end face fixed block 12.In installation process, first by end face fixed block 12 by welding or the mode such as riveted joint is permanently affixed on magnet end face 102, baffle plate 9 is pressed on end face fixed block 12, with screw 11, both is locked.It follows that by push rod 6 through the screwed hole on baffle plate, rotate push rod 6, boss 7 holds out against gradient coil end face, then the first clamp nut 8 and the second clamp nut 10 is locked, and completes axial the fixing of gradient coil.Axial restraint assembly is both needed to install at magnet both sides end face.Baffle plate 9 is the first end of radially fixed assembly, and boss 7 is fixed on push rod 6 end relative with baffle plate 9, to constitute the second end of described radially fixed assembly.
In this patent, the fixing of gradient coil is divided into radial and axial both direction.
Fixing of radial direction: one layer of damping layer of lower section pad of main magnet and gradient coil, it is to avoid the vibration of gradient passes to main magnet.Gradient coil is preset notch, then the projection section in fixed block is embedded in notch.With the screw of certain length through the through hole on boss, fixed block is pressed in groove.Rotating push rod, the radially fixed boss (cushion pad) that holds out against passed through holds out against with magnet inner surface.Turn the nut on push rod, pin push rod, it is prevented that in use getting loose occurs in push rod.So, the radial direction of gradient is just fixed.
The advantage of this fixed form is in that: being fixed as of radial direction is flexible fixing, the vibration of gradient will not be passed to magnet；Radial force is born by the axially projecting portion of radially fixed part, it is to avoid screw stress fracture occurs or destroys default screw thread；Need not often safeguard, mount and dismount also more convenient.
Fixing of axial direction: welding is reserved with the fixed block of screwed hole on magnet, is pressed on fixed block by pressing plate by screw.Fixing plate screws in two push rods, rotates push rod, until after withstanding gradient end face, locking push rod is positioned at the nut before and after pressing plate.Whole installation process is simple, easy to operate.Pressing plate is all needed to carry out axial restraint before and after magnet.
Although this utility model discloses as above with preferred embodiment; so it is not limited to this utility model; any those skilled in the art; without departing from spirit and scope of the present utility model; when doing a little amendment and perfect, therefore protection domain of the present utility model is when with being as the criterion that claims define.
Claims (10)
1. the magnet assembly for nuclear magnetic resonance, it includes main magnet, gradient coil, described main magnet is provided with the host cavity axially extended, described gradient coil is installed in the host cavity of main magnet, the gap of ring-type is formed between described gradient coil and main magnet, the bottom in described gap is provided with damping layer, it is characterized in that, described magnet assembly also includes the radially fixed assembly for fixing gradient coil, described radially fixed assembly includes the first end and the second end that are oppositely arranged, first end of described radially fixed assembly is resisted against on gradient coil, second end of described radially fixed assembly is resisted against main magnet, and the length of described radially fixed assembly is radially adjustable.
2. the magnet assembly for nuclear magnetic resonance according to claim 1, it is characterised in that the first end of described radially fixed assembly is fixed on gradient coil, the second end of described radially fixed assembly is resisted against the inwall of the host cavity of main magnet.
3. the magnet assembly for nuclear magnetic resonance according to claim 1, it is characterized in that, described radially fixed assembly includes fixed block, push rod, described fixed block and gradient coil are fixed, described push rod is provided with screw thread, described fixed block is provided with screwed hole, and described push rod screws in the screwed hole of fixed block, and described push rod radially extends.
4. the magnet assembly for nuclear magnetic resonance according to claim 3, it is characterised in that described radially fixed assembly also includes screw, described screw is through the through hole on the protuberance of fixed block and is assembled in gradient coil.
5. the magnet assembly for nuclear magnetic resonance according to claim 3, it is characterised in that described radially fixed assembly also includes the clamp nut being mounted on push rod, and described clamp nut supports and terminates in fixed block.
6. the magnet assembly for nuclear magnetic resonance according to claim 3, it is characterised in that the end that described push rod is relative with fixed block is provided with boss and the second end that described boss and described end are described radially fixed assembly.
7. the magnet assembly for nuclear magnetic resonance according to claim 1, it is characterised in that the end of described gradient coil is provided with notch, described fixed block has axially projecting portion, and described axially projecting portion is embedded in notch.
8. the magnet assembly for nuclear magnetic resonance according to claim 1, it is characterized in that, described magnet assembly also includes axial restraint assembly, described axial restraint assembly includes the first end and the second end that are oppositely arranged, second end of described axial restraint assembly is resisted against on gradient coil, first end of described axial restraint assembly is fixed on main magnet, and the length of described axial restraint assembly is adjustable vertically.
9. the magnet assembly for nuclear magnetic resonance according to claim 8, it is characterized in that, described axial restraint assembly includes push rod, the first clamp nut, baffle plate, the second clamp nut, described baffle plate is connected on main magnet, described push rod is provided with screw thread and coordinates with the screwed hole on baffle plate, described first clamp nut and the second clamp nut are assemblied on push rod and are pressed in the two sides of baffle plate, and the end of described push rod is provided with boss, and described boss presses on gradient coil.
10. the magnet assembly for nuclear magnetic resonance according to claim 8, it is characterised in that described magnet assembly includes two axial restraint assemblies, is separately positioned on the axial both sides of main magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620140322.0U CN205404780U (en) | 2016-02-25 | 2016-02-25 | A magnet subassembly for magnetic resonance imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620140322.0U CN205404780U (en) | 2016-02-25 | 2016-02-25 | A magnet subassembly for magnetic resonance imaging |
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| Publication Number | Publication Date |
|---|---|
| CN205404780U true CN205404780U (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620140322.0U Active CN205404780U (en) | 2016-02-25 | 2016-02-25 | A magnet subassembly for magnetic resonance imaging |
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| Country | Link |
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| CN (1) | CN205404780U (en) |
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- 2016-02-25 CN CN201620140322.0U patent/CN205404780U/en active Active
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| C14 | Grant of patent or utility model | ||
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201807 No. 2258 Chengbei Road, Jiading Industrial Zone, Jiading District, Shanghai. Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201807 No. 2258 Chengbei Road, Jiading Industrial Zone, Jiading District, Shanghai. Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |