CN201141912Y - Shock-absorbing device for magnetic resonance system - Google Patents
Shock-absorbing device for magnetic resonance system Download PDFInfo
- Publication number
- CN201141912Y CN201141912Y CNU2007203101974U CN200720310197U CN201141912Y CN 201141912 Y CN201141912 Y CN 201141912Y CN U2007203101974 U CNU2007203101974 U CN U2007203101974U CN 200720310197 U CN200720310197 U CN 200720310197U CN 201141912 Y CN201141912 Y CN 201141912Y
- Authority
- CN
- China
- Prior art keywords
- magnet
- gradient coil
- vibration absorber
- vibration
- magnetic resonance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The utility model provides a damping device of a magnetic resonance system. The magnetic resonance system includes a magnet and a gradient coil which are installed together by a plurality of suspending devices respectively arranged at the two ends of the gradient magnet and coil. Each suspending device includes a flexible suspending steel rope, a fixed terminal fixed on the magnet, a moveable terminal fixedly connected with the end of the suspending rope, and a spring and a damper installed between the fixed terminal and the moveable terminal. The utility model isolates the gradient coil and the magnet through the suspending rope and the spring, thereby making the minimum vibration transmitting to the magnet when the gradient coil works; the vibration of the magnet is reduced and the noise of the whole system is also reduced.
Description
Technical field
The utility model relates to a kind of vibration absorber, especially a kind of vibration absorber that is used for magnetic resonance system.
Background technology
Magnetic resonance system is medically having a wide range of applications, and it generally includes magnet and gradient coil.In magnetic resonance system, magnet produces uniform main field, in order when working, to produce gradient magnetic, gradient coil need feed the big electric current of alternation, therefore can under the effect of main field, form alternating magnetic fields power, cause the gradient coil vibration, and the gradient coil vibration can produce vibration by making whole magnet being connected of gradient coil and magnet, the vibration of gradient coil and magnet is the main source of magnetic resonance system noise.What the noise that magnetic resonance system produces can cause the detected person does not accommodate fear, thereby might influence testing result.Thereby the size of noise is an important indicator of system performance.
US 6,043, the solution that proposes among 653 A is that gradient coil is fixed on the floor by the independent support structure, thereby make separating of gradient coil and magnet machinery, the vibration of avoiding gradient coil is delivered on the magnet by connection between the two, thereby reduce the vibration of magnet itself, reach the purpose that reduces noise.Make in this way and magnet and gradient coil must be respectively installed on the floor, increased the time and the complicacy of installing, must when mounted magnet be aimed at accurately with gradient coil, have relatively high expectations for the level on floor and the level of floor attachment point.Simultaneously, can not before dispatching from the factory, magnet and gradient coil be installed in advance.
US 5,793, and the solution that 210 A propose is that gradient coil is placed on separately in the vacuum tank, outwards propagate by air with the noise sound wave that the vibration of blocking-up gradient coil produces, thus the noise of reduction magnetic resonance system.The design of this method against vacuum equipment, installation, seal request are all higher, must cause the equipment cost costliness.
The exchange current of gradient pulse is subjected to the electromagnetic force of alternation in main field, the electromagnetic force excite gradients coil vibration of this alternation produces noise.At US 6,236, among 204 A, a kind of gradient pulse that reduces noise is proposed, in this gradient pulse, part gradient pulse is realized the normal function of gradient pulse, and another part is used to reduce the vibration generation active damping effect of the pulse of noise to gradient coil, thereby the vibration that reduces gradient coil reduces noise.Realize that this scheme needs special-purpose precision equipment that high-quality pulse is provided, and has increased equipment cost.
US 6,107, and the technical solution that 799 A propose is to fill cushion blocking between gradient coil and magnet.Cushion blocking can be filled with gas, liquid etc., and both fixing gradient coil can play damping action again, reduced the vibration of gradient coil itself, thereby reduces noise.Cushion blocking needs special material and technology to make, and usable floor area is big, increased and manufacture and design and maintenance cost, is not easy to install.
The utility model content
The technical problems to be solved in the utility model provides a kind of vibration absorber that is used for magnetic resonance system, to reduce or to avoid problem noted earlier.
Above-mentioned technical matters of the present utility model can adopt following technical scheme to realize, a kind of vibration absorber that is used for magnetic resonance system, described magnetic resonance system comprises a magnet and a gradient coil, described magnet and described gradient coil are installed together by a plurality of suspenders that are arranged in gradient magnet and coil two ends, make at interval predetermined gap of gradient coil and magnet.
Preferably, each described suspender can comprise a suspension line, and described gradient coil is suspended on described magnet two ends by the described suspension line of above-mentioned suspender.Choosing is more arranged, and described suspension line is the suspension cable wire that possesses certain flexibility.
Preferably, each described suspender includes a fixed terminal that is fixed on the described magnet, a movable terminal of fixedlying connected with described suspension line end, and a buffer gear that is installed between described fixed terminal and the described movable terminal.Described buffer gear can comprise a spring; Described buffer gear also can comprise a damper; Described buffer gear can also comprise a spring and a damper.
Preferably, described gradient coil is provided with the web joint that links to each other with described suspender.
Preferably, described magnet is a superconducting magnet.
In the above-mentioned optimal technical scheme of the present utility model,, avoided vibration to be directly delivered on the magnet from gradient coil because gradient coil is suspended on the magnet.For gradient coil and magnet are separately fixed at method on the floor, no longer need separately gradient coil to be fixed, before dispatching from the factory, promptly can install in advance, be convenient to install, move.
Gradient coil is fixed by suspended structure, can when design, select the spring of different-stiffness, thereby play the effect of adjusting the gradient coil natural frequency, avoid the conventional pairing vibration frequency of clinical practice sequence, thereby avoid gradient coil near natural frequency, to vibrate, reach the purpose that reduces to vibrate.Comprise damped part in the suspended structure of gradient coil, certain damping can be provided when gradient coil vibrates, consume vibrational energy, thereby reduce noise.
With respect to the method that is placed on gradient coil in the vacuum (-tight) housing, special-purpose damping pulse is provided and places cushion blocking, the utlity model has simple in structure, do not need specialized equipment and material, be convenient to install, advantage with low cost.
Description of drawings
The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein,
Fig. 1 is the end view according to the preferred embodiment of a kind of suspender that is used for magnetic resonance system of the present utility model;
Fig. 2 is the longitudinal profile synoptic diagram of the preferred embodiment of a kind of suspender that is used for magnetic resonance system shown in Figure 1;
Fig. 3 is the enlarged drawing of the suspender among Fig. 1 and Fig. 2.
Embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast description of drawings embodiment of the present utility model.Wherein, identical parts adopt identical label.
Referring to Fig. 1 and Fig. 2, a kind of vibration absorber that is used for magnetic resonance system that the utility model proposed adopts the form of synoptic diagram to represent, wherein, and Reference numeral 1 expression magnet; Reference numeral 2 expression gradient coils; Reference numeral 3 expression suspenders.Wherein magnet 1 can be any common permanent magnet, often lead or superconducting magnet.Magnet 1 is tubular structure, and its inner concentric is being arranged the gradient coil 2 of tubular.
As depicted in figs. 1 and 2, gradient coil 2 is installed together by a plurality of suspenders 3 that are arranged in gradient coil 2 and magnet 1 two ends with magnet 1, makes gradient coil 2 and magnet 1 predetermined gap at interval.As seen from the figure, gradient coil 2 only links to each other with magnet 1 by described suspender 3, between the two without any other contact, thereby gradient coil 2 is kept apart with magnet 1 as far as possible, reduced because of the vibration of gradient coil 2 influence total system.For example, when vibrating under the effect of gradient coil 2 in alternating magnetic fields, gradient coil 2 can not contact with magnet 1, thereby has reduced the possibility that produces noise between the two because of friction, collision.
In the utility model, the suspender 3 that is arranged in gradient coil 2 and magnet 1 two ends can be every end more than 3, and in the accompanying drawing of present embodiment, gradient coil 2 and magnet 1 two ends respectively are furnished with 4 suspenders 3.
From the accompanying drawing 2 of present embodiment as seen, the longitudinal length of gradient coil 2 is shorter than the length of magnet 1, therefore corresponding to each suspender 3, can also on gradient coil 2, be provided with and suspender 3 the same number of web joints 5, be used for gradient coil 2 and suspender 3 being linked together by described web joint 5.Certainly, if in installation process, the equal in length of the length of gradient coil 2 and magnet 1 then need not to use web joint 5; If perhaps gradient coil 2 one ends and magnet 1 corresponding are held level with both hands together, the longitudinal length of the other end of gradient coil 2 is shorter than the length of magnet 1 a corresponding end, then only need web joint 5 to be set, be used for gradient coil 2 and suspender 3 being linked together by described web joint 5 at the short end of this gradient coil 2.
In the present embodiment, each suspender 3 can preferably include a suspension line 4, that is, gradient coil 2 can be suspended on magnet 1 two ends by the suspension line 4 of suspender 3.Described suspension line 4 can be the suspension cable wire that possesses certain flexibility, thereby can cushion part vibration, thereby can avoid vibration to pass to magnet 1 by suspension line 4 as far as possible, thereby reduce because of the vibration of gradient coil 2 influence to total system from gradient coil 2.
The concrete structure of 3 pairs of suspenders 3 is described explanation with reference to the accompanying drawings; certainly; following explanation only is exemplary; therefore can not be with it as a kind of qualification to the utility model claim required for protection, those skilled in the art can also make various improvement or change in the scope of the utility model claim required for protection.
As shown in Figure 3, each suspender 3 can comprise 31, one movable terminal 32 of fixedlying connected with suspension line 4 ends of fixed terminal that are fixed on the magnet 1, and one is installed in buffer gear between fixed terminal 31 and the movable terminal 32.When vibration takes place, be installed between fixed terminal 31 and the movable terminal 32 buffer gear and can cushion a part and pass to the vibration of magnet 1 by suspension line 4, thereby reduced because of the vibration of gradient coil 2 influence to total system from gradient coil 2.
Described buffer gear can comprise a spring 33; Perhaps can comprise a damper 34; Perhaps can also comprise a spring 33 and a damper 34 (as shown in Figure 3).
Under normal conditions, when the excitation frequency in the external world during near the natural frequency of vibrating mass itself, vibrating mass will resonate, and amplitude during resonance and noise will sharply amplify.When design and assembling magnetic resonance system, can select to be fit to the spring 33 of rigidity, make the resonant frequency of gradient coil 2 avoid the frequency of dynamic excitation as far as possible, thereby avoid the generation of gradient coil 2 resonance, reduce vibration.
Because the utility model is suspended on gradient coil 2 on the magnet 1 by suspender 3, thereby the two just can be installed together when dispatching from the factory, when having avoided installing to the influence of precision.In addition, the utility model is also kept apart gradient coil 2 and magnet by measures such as suspension line, buffer gears as far as possible, be delivered on the magnet 1 thereby the vibration when making gradient coil 2 work is the least possible, make magnet 1 vibration reduce, reduced the noise of total system.And, can change spring easily according to the difference of the actual natural frequency of system as buffer gear, feasible design is more flexible, and damper 34 can provide certain damping, consumes vibrational energy when gradient coil 2 vibrations, thereby reduce the conversion of energy of vibration, reduce noise to acoustic energy.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1, a kind of vibration absorber that is used for magnetic resonance system, described magnetic resonance system comprises a magnet (1) and a gradient coil (2), it is characterized in that, described magnet (1) and described gradient coil (2) are installed together by a plurality of suspenders (3) that are arranged in gradient magnet (1) and coil (2) two ends, make predetermined gap, gradient coil (2) and magnet (1) interval.
2, vibration absorber according to claim 1, wherein, each described suspender (3) comprises a suspension line (4), described gradient coil (2) is suspended on described magnet (1) two ends by the described suspension line (4) of above-mentioned suspender (3).
3, vibration absorber according to claim 2, wherein, described suspension line (4) is for possessing the suspension cable wire of certain flexibility.
4, according to claim 2 or 3 described vibration absorbers, wherein, each described suspender (3) includes a fixed terminal (31) that is fixed on the described magnet (1), a movable terminal (32) of fixedlying connected, and a buffer gear that is installed between described fixed terminal (31) and the described movable terminal (32) with described suspension line (4) end.
5, vibration absorber according to claim 4, wherein, described buffer gear comprises a spring (33).
6, vibration absorber according to claim 4, wherein, described buffer gear comprises a damper (34).
7, vibration absorber according to claim 4, wherein, described buffer gear comprises a spring (33) and a damper (34).
8, according to the described vibration absorber of one of claim 1-7, wherein, described gradient coil (2) is provided with the web joint (5) that links to each other with described suspender (3).
9, according to the described vibration absorber of one of claim 1-7, wherein, described magnet (1) is a superconducting magnet.
10, vibration absorber according to claim 8, wherein, described magnet (1) is a superconducting magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203101974U CN201141912Y (en) | 2007-12-29 | 2007-12-29 | Shock-absorbing device for magnetic resonance system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203101974U CN201141912Y (en) | 2007-12-29 | 2007-12-29 | Shock-absorbing device for magnetic resonance system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201141912Y true CN201141912Y (en) | 2008-10-29 |
Family
ID=40069623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007203101974U Expired - Lifetime CN201141912Y (en) | 2007-12-29 | 2007-12-29 | Shock-absorbing device for magnetic resonance system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201141912Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346241A (en) * | 2010-07-27 | 2012-02-08 | 通用电气公司 | Acoustically damped gradient coil |
| CN104115019A (en) * | 2011-12-08 | 2014-10-22 | 英国西门子公司 | Vibration isolation for superconducting magnets |
| CN104181477A (en) * | 2014-07-24 | 2014-12-03 | 上海联影医疗科技有限公司 | Magnetic resonance system and support thereof |
| CN105139993A (en) * | 2015-09-23 | 2015-12-09 | 奥泰医疗系统有限责任公司 | Suspension device for superconducting magnet |
-
2007
- 2007-12-29 CN CNU2007203101974U patent/CN201141912Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346241A (en) * | 2010-07-27 | 2012-02-08 | 通用电气公司 | Acoustically damped gradient coil |
| CN104115019A (en) * | 2011-12-08 | 2014-10-22 | 英国西门子公司 | Vibration isolation for superconducting magnets |
| CN104115019B (en) * | 2011-12-08 | 2017-10-24 | 西门子保健有限公司 | Mount point, superconducting magnet structure, a device and supporting plate |
| CN104181477A (en) * | 2014-07-24 | 2014-12-03 | 上海联影医疗科技有限公司 | Magnetic resonance system and support thereof |
| CN104181477B (en) * | 2014-07-24 | 2015-12-02 | 上海联影医疗科技有限公司 | For support, the magnetic resonance system of magnetic resonance system |
| CN105139993A (en) * | 2015-09-23 | 2015-12-09 | 奥泰医疗系统有限责任公司 | Suspension device for superconducting magnet |
| CN105139993B (en) * | 2015-09-23 | 2017-08-04 | 奥泰医疗系统有限责任公司 | A kind of suspension apparatus of superconducting magnet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101944654B1 (en) | Linear vibration motor | |
| US9252648B2 (en) | Power generator and power generating system | |
| KR100500129B1 (en) | Vibration speaker | |
| US7288861B1 (en) | Inertial actuator with multiple flexure stacks | |
| CN201141912Y (en) | Shock-absorbing device for magnetic resonance system | |
| CN108953473B (en) | A kind of vibration isolator of achievable horizontal decoupling | |
| KR101728816B1 (en) | Horizontal Vibration Motor | |
| JP2014079118A (en) | Power generator | |
| JP2011217431A (en) | Vibration generator using blade spring and blade spring for vibration generators | |
| RU2412511C1 (en) | Vibration damper | |
| US20160123423A1 (en) | Sound reduction or vibration damping apparatus and structural member | |
| US8164337B2 (en) | Assembly with a vibration-isolated cover | |
| CN110212729A (en) | Vibratory driver | |
| JP6758041B2 (en) | Viaduct with damping power generation device and vibration damping power generation device | |
| JP5697876B2 (en) | Power generator | |
| CN113175563A (en) | Self-adjusting ship pipeline vibration damping device and vibration damping method thereof | |
| KR101588713B1 (en) | Energy harvester and self powered wireless sensor module using 2-way compression load | |
| CN106979273A (en) | A kind of engine snubber based on magnetic converting technique | |
| CN106337893A (en) | Magnetic resistance type electromagnetic active vibration isolator | |
| CN109027503A (en) | A kind of marine piping shock-damping structure | |
| WO2016076382A1 (en) | Power generation device and power generation system | |
| WO2011056257A1 (en) | Electromagnetic inertial actuator | |
| KR101301349B1 (en) | Dynamic Absorber | |
| CN218119989U (en) | Pipeline shock absorption structure and air conditioner outdoor unit | |
| CN216078095U (en) | Vibration damping device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081029 |