CN205120950U - Gradient coil termination and magnetic resonance system - Google Patents
Gradient coil termination and magnetic resonance system Download PDFInfo
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- CN205120950U CN205120950U CN201520860184.9U CN201520860184U CN205120950U CN 205120950 U CN205120950 U CN 205120950U CN 201520860184 U CN201520860184 U CN 201520860184U CN 205120950 U CN205120950 U CN 205120950U
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Abstract
The utility model discloses a gradient coil termination, including combine fixed module and a plurality of electrically conductive unit together, fixed module is extended along first direction, second orientation, electrically conductive unit is followed the second orientation and is extended, and electrically conductive unique tuple that can switch on positive negative direction electric current of per two electrically conductive units component, the electrically conductive unit of a plurality of is divided into three electrically conductive unique tuple at least along the first direction, it is terminal that electrically conductive unit has relative two, exposes fixed module outside, external cable and gradient coil are connected respectively to two ends. The utility model discloses an electrically conductive unit of gradient coil termination and fixed module integrated into one piece and closely fixed, conductor vibration in the time of can effectively reducing to switch on. Furthermore, the utility model provides a magnetic resonance system.
Description
[technical field]
The utility model relates to magnetic resonance arts, particularly relates to a kind of gradient coil termination and magnetic resonance system.
[background technology]
Magnetic resonance imaging (MagneticResonanceImaging, MRI) is a kind of biomagnetism nuclear spin imaging technique developed rapidly along with the development of computer technology, superconductor technology, electronic circuit technology technology.Owing to having non-intrusion type, without ionising radiation, diagnosing the features such as quick, accurate, this technology has become one of important tool of medical clinic applications and research.MR imaging apparatus comprises superconducting magnet, gradient system, power pack, radiofrequency launcher and MR signal receiver.Gradient system is one of most important hardware of MR, is made up of gradient coil, gradient amplifier, digital to analog converter, gradient controller, gradient cooling device etc.The gradient magnetic of the linear change of generation of gradient system, its Main Function has: the space orientation coding carrying out MRI signal; Switched by gradient fields and produce gtadient echo, thus produce MR echoed signal; Apply diffusion sensitising gradient field, for water diffusion weighted imaging; Carry out flowing to compensate; Carry out the flow velocity phase encoding etc. of working fluid.Gradient coil in gradient system runs various pulse train implementation space coding, for MR image provides spatial information.
With the development of examining MR technology, the performance of application to gradient coil of many important imaging functions proposes very high requirement, and the header functionality magnetic resonance imaging of such as high speed requires high switching rate and the high gradient intensity of gradient; And for example in head diffusion tensor imaging, in order to obtain the higher b factor, also need very high gradient intensity.In order to produce gradient magnetic, pulse-type current need be applied to gradient coil.In prior art, generally realize gradient coil current supply by connecting wire (cable) between gradient amplifier and gradient coil, and the electric current of gradient coil operation reaches hundreds of ampere, current switching rate (current-rising-rate or rate of descent) reaches hundreds of A/S, and the current excitation voltage provided by gradient amplifier is up to thousands of volt.So high current value and current changing rate act on the order of magnitude when being the main field of 1T, the powerful Ampère force be subject to can make the service cable of gradient coil thermal agitation in high-intensity magnetic field, and easily cause gradient cable and gradient junction to loosen, cause that local electrical resistance is too high causes heating, and then draw the damage of phase gradient cable connection.Given this, be necessary to propose a kind of gradient coil termination of conductor vibration when effectively reducing energising.
[utility model content]
Technical problem to be solved in the utility model is to provide a kind of gradient coil termination of conductor vibration when effectively reducing energising.
For achieving the above object, the utility model proposes a kind of gradient coil termination, comprise the stuck-module and some conductive units that combine, described stuck-module is along first direction, second direction extends, described conductive unit extends along second direction, and every two conductive units form one can the conductive unit group of the positive and negative directional current of conducting, several conductive units described are divided at least three conductive unit groups along first direction, described conductive unit has two relative ends, expose outside stuck-module, described two ends connect external cable and gradient coil respectively.
Further, described conductive unit is strip structure, parallel with the upper surface of stuck-module or lower surface.
Further, an end of described stuck-module is provided with groove, and an end of described conductive unit extends in groove, and the leading edge of described conductive unit does not exceed the front end face of groove.
Further, the other end of described conductive unit stretches out from described stuck-module.
Further, described groove be divided into some groups and with described conductive unit one_to_one corresponding, be provided with spacer portion between adjacent grooves.
Further, the groove with the end place of group conductive unit is separated by the first spacer portion, and by the second spacer portion separately, the width of described first spacer portion is less than the width between the second spacer portion to the groove at the end place of different group conductive unit.
Further, the two ends of described conductive unit are provided with connecting hole, and described conductive unit is arranged to different length according to described stuck-module from the extension line of described gradient coil.
Further, described stuck-module is formed by being cast in by insulating material on described conductive unit, and described conductive unit is packaged together in described stuck-module solidification process.
The utility model also proposes a kind of magnetic resonance system, comprise gradient coil termination, shell, be built in gradient coil in shell and gradient amplifies power supply, described gradient coil termination includes stuck-module and conductive unit, described stuck-module is fixing on the housing, described conductive unit and described stuck-module are packaged together, and described conductive unit has two opposing end portions exposing stuck-module, amplifies power supply be respectively connected with gradient coil and gradient.
Further, also comprise the temperature induction unit being arranged on described stuck-module inside, for monitoring described conductive unit by temperature during electric current, the temperature information that described temperature induction unit obtains is sent to data processing unit by transmission cable; Described data processing unit is installed on shell.
Compared with prior art, the technical solution of the utility model has following beneficial effect: by hot pouring method, stuck-module and the one-body molded design of conductive unit, enhance the compactedness that both combine, conductive unit is firmly limited in the holding part of stuck-module, can not combine the phenomenon loosened because of producing by magnetic field Ampère force two modules; Metallic conductor in conductive unit one group between two, often Ampère force suffered by group metallic conductor etc. are oppositely large, and external force suffered by stuck-module keeps balance, thus the vibration of reduction because producing by external force; Be provided with U-lag in stuck-module, add the creepage distance between two adjacent metallic conductors, improve with cable connection safety.
[accompanying drawing explanation]
Fig. 1 is the utility model gradient coil termination front elevation;
Fig. 2 is the utility model gradient coil termination rear view;
Fig. 3 is this use novel gradient winding wiring device stereographic map;
Fig. 4 is the stuck-module front view of the utility model gradient coil termination;
Fig. 5 is the stuck-module stereographic map of the utility model gradient coil termination;
Fig. 6 is the utility model magnetic resonance system schematic diagram;
Fig. 7 is the utility model magnetic resonance system close-up schematic view.
[embodiment]
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described in detail, but protection domain of the present utility model should not be limited with this.
The utility model gradient coil termination, comprise the stuck-module (1) and some conductive units (2) that combine, stuck-module (1) is (parallel with X-direction along first direction, i.e. left and right directions), second direction is (parallel with Y direction, i.e. fore-and-aft direction) extend, conductive unit (2) extends along second direction, and every two conductive units (2) form one can the conductive unit group (20) of the positive and negative directional current of conducting, conductive unit (2) is divided at least three conductive unit groups (20) along first direction, conductive unit (2) has two relative ends, expose stuck-module (1) outside, two ends connect external cable and gradient coil respectively.Conductive unit (2) can be arranged in strip, cylindric, circular tube shaped or oval tubulose any one.If Fig. 1 is the utility model novel gradient winding wiring device front elevation, stuck-module (1) and some conductive units (2) combine, its concrete combination is: an end of stuck-module (1) is provided with groove (11), an end of conductive unit (2) extends in groove (11), and the leading edge (210) of conductive unit (2) does not exceed the front end face (16) of groove (11).The other end of conductive unit (2) stretches out from stuck-module (1).Conductive unit is specially strip structure and for metallic conductor, and upper surface or the lower surface of position and stuck-module are parallel, and more specifically, metallic conductor is copper bar, and the length of copper bar is about 300mm, and thickness is about 5mm, and number is 6.Above-mentioned copper bar is fixed in stuck-module (1) side by side, adjacent copper bar forms conductive unit group between any two, and often group metallic conductor is arranged to different length according to stuck-module (1) from the extension line of gradient coil, can find out that edge gradient lead-out wires of coil is greater than the distance of zone line gradient coil extension line to stuck-module to the distance of stuck-module from figure, therefore, the bonding jumper length being arranged on two ends is greater than the bonding jumper being arranged on zone line.Groove (11) be divided into some groups and with conductive unit (2) one_to_one corresponding, in order to coordinate the insulation between adjacent conductor unit conductive unit (2), adjacent grooves is provided with spacer portion between (11), groove with the end place organizing conductive unit (2) is opened by the first compartment (101), the groove at the end place of different group conductive unit (2) is opened by the second compartment (102), and the width of the first spacer portion (101) is less than the width between the second spacer portion (102).In a particular embodiment, groove (11) is set to U-lag, and is corresponding with metallic conductor, is namely placed with a part for metallic conductor in each U-lag (11).It should be noted that, stuck-module (1) can adopt the insulating material preparations such as polystyrene, teflon, epoxy resin, phenolics or silica resin, and stuck-module (1) and conductive unit (2) are formed in one.In addition, the longitudinal size of stuck-module (1) is generally longer than as the length of the metallic conductor of conductive unit (2).As shown in Figure 1, one end of metallic conductor is arranged in U-lag, and the other end passes stuck-module (1).The two ends of conductive unit are provided with connecting hole, and in figure, the two ends of metallic conductor are respectively arranged with connecting hole (21), are convenient to amplify power supply with gradient coil and gradient and are connected respectively.For cushion gradient termination is owing to being subject to excessive Ampère force and generation deformation of vibrating, the connecting hole (21) that the metallic conductor end passing stuck-module (1) is arranged also available connecting ear substitutes, and is beneficial to the deformation of metallic conductor in tolerance interval.For preventing the electric leakage of cable connection and magnetic resonance system shell in U-lag, as shown in Figure 2, stuck-module (1) back is also provided with strip insulation course (12).
By installing cover plate additional to strengthen linking relationship between the two between stuck-module (1) and conductive unit (2) in prior art, but owing to being subject to the effect of powerful Ampère force, metallic conductor stressed cover plate that still can cause in certain direction in magnetic field loosens, thus more weak stuck-module is for the fixed effect of conductive unit.In the utility model one embodiment, the preparation process of gradient coil termination is specially: first, select the mould preparing stuck-module (1), the projection corresponding with the stuck-module that will prepare (1) further groove (11) is included in this mould, distance between projection is also not quite identical, can place according to the actual requirements, and conductive unit (2) (metallic conductor) is positioned over the appropriate location (two adjacent projections zone lines, adjacent spacing 35mm) of mould; Secondly, thermoplastic insulation material's epoxy resin is elevated to 150-200 DEG C and is molten into liquid state; Again, by the poured with epoxy resin of liquid state in a mold; Finally, stuck-module (1) as shown in Figure 3 and the integrated gradient coil termination of conductive unit (2) can be obtained after epoxy resin cooling forming, stuck-module (1) extends along first direction (in the X-direction in X-Y plane), second direction (Y direction in X-Y plane), and conductive unit (2) extends along second direction.Pass through said process, the conductive unit (2) of metallic conductor composition is encapsulated in stuck-module (1) in thermoplastic insulation material's solidification process, in addition, for strengthening the fastness combined further between the two, the part that the module that is fixed by bonding jumper (1) encapsulates covering completely arranges screw-shaped uneven surface.The gradient coil termination obtained by above-mentioned preparation process, the strong bonded of stuck-module (1) and conductive unit (2), without the need to installing the locating devices such as cover plate additional between stuck-module (1) and conductive unit (2), stuck-module (1) fully fixing for conductive unit (2) can be realized, the vibration produced because metallic conductor is subject to Ampère force when effectively reducing big current energising.If Fig. 4 is the utility model stuck-module (1) structural representation, its one end upper surface is provided with groove (11), groove (11) shape is U-shaped in the present embodiment, the number of U-lag is 6, U-lag (111) and (112) corresponding same group of metallic conductor in figure, be the first spacer portion between the two, U-lag (112) different group metallic conductors corresponding to (113), be the second spacer portion between the two, direction of current in same group of bonding jumper is contrary, suffered Ampère force is cancelled out each other, and stuck-module is suffered makes a concerted effort close to zero.It should be noted that, the setting of groove (11) adds the creepage distance between adjacent metal conductor, and the insulating material around metallic conductor can be prevented to be electrically polarized and to cause insulating material to present electriferous state.As shown in Figure 5, be provided with the holding part (13) of communication groove (11) at the bottom end face of stuck-module (1) other end, in groove (11), be also provided with cable mounting hole (14).During use, metallic conductor arrives groove (11) by the holding part (13) of bottom end face through stuck-module (1) inside, external cable connection metal conductor, cable and metallic conductor joint are fixed by the connecting hole (21) of metallic conductor end and cable mounting hole (14) by the fixtures such as nonmagnetic bolt.Stuck-module (1) is also provided with counterbore (15), and the bottom of counterbore (15) is set to through hole, for the stuck-module (1) coordinated with conductive unit (2) is installed on magnetic resonance system shell.In addition, stuck-module (1) is also provided with temperature induction unit (not shown), be connected with data processing unit (4) (shown in Fig. 1 and Fig. 2) by transmission line (3), the temperature of monitoring conductive unit.Temperature induction unit can adopt in thermopair, thermistor or digital temperature sensor etc. any one.In the utility model specific embodiment, temperature induction unit adopts Fibre Optical Sensor, and its electrical insulation capability contacted with metallic conductor is good, anti-electromagnetic interference capability strong, and temperature survey is accurate, strong adaptability.
Above-mentioned gradient coil apparatus can be applicable to magnetic resonance system, realize the connection between gradient coil and gradient amplification power supply, as shown in Figure 6, comprise gradient coil termination, shell (6), be built in the gradient coil in shell (6) and gradient amplification power supply, gradient coil termination includes stuck-module (1) and conductive unit (2), stuck-module is fixed on shell (6), conductive unit (2) and stuck-module (1) are packaged together, and conductive unit (2) has two opposing end portions exposing stuck-module (1), amplify power supply with gradient coil and gradient to be respectively connected.
Fig. 7 is gradient coil termination partial enlarged drawing, one end of stuck-module (1) is provided with groove (11), conductive unit (2) (metallic conductor) is encapsulated in stuck-module (1), one end of conductive unit (2) is connected with gradient coil, the other end connects gradient at groove (11) and amplifies power supply, concrete connected mode is: one-body molded between conductive unit (2) (metallic conductor) and stuck-module (1), gradient amplifies power supply connects each metallic conductor at groove (11) place one end by cable, counterbore (15) is set in groove (11), the fixtures such as nonmagnetic bolt are by the connecting hole (21) on metallic conductor and the counterbore (15) in groove (11) being fixedly connected with of line feeder cable joint place further.The other end of metallic conductor is connected with gradient coil through stuck-module (1), its concrete connected mode is: the spacing hole that nonmagnetic bolt passes through connecting hole (21) and is arranged on gradient coil, is fixedly connected with by the end points of metallic conductor with gradient coil.Above-mentioned metallic conductor one group between two, the direction of current that the metallic conductor belonging to same group flows through is contrary, and one of them conductor is used for amplifying power supply to gradient coil input current from gradient, and another one conductor is used for amplifying power supply from gradient coil to gradient and feeds back electric current.Metallic conductor is connected with gradient coil by connecting ear, the Ampère force be subject under high-intensity magnetic field through the electric current of metallic conductor with buffer stream and cause the deformation of conductor.Gradient termination also includes beam (5), beam (5) is specifically arranged between stuck-module (1) and the surface of contact of magnetic resonance system shell, weaken the vibration of stationary installation because producing by Ampère force further, and then it is loosening to reduce metallic conductor and gradient coil junction.Above-mentioned magnetic resonance system also comprises the temperature induction unit being arranged on described stuck-module (1) inside, for monitoring conductive unit (1) by temperature during electric current, the temperature information that temperature induction unit obtains is sent to data processing unit (4) by transmission cable (3), data processing unit can be installed on magnetic resonance system shell (6), also can with other RF signal collection units shared data handling systems inner.
The foregoing is only preferred embodiment of the present utility model, it not whole or unique embodiment, the change of those of ordinary skill in the art by reading the utility model instructions to any equivalence that technical solutions of the utility model are taked, is claim of the present utility model and contains.
Claims (10)
1. a gradient coil termination, it is characterized in that, comprise the stuck-module and some conductive units that combine, described stuck-module extends along first direction, second direction, described conductive unit extends along second direction, and every two conductive units form one can the conductive unit group of the positive and negative directional current of conducting, several conductive units described are divided at least three conductive unit groups along first direction, described conductive unit has two relative ends, expose outside stuck-module, described two ends connect external cable and gradient coil respectively.
2. gradient coil termination as claimed in claim 1, it is characterized in that, described conductive unit is strip structure, parallel with the upper surface of stuck-module or lower surface.
3. gradient coil termination as claimed in claim 1, it is characterized in that, an end of described stuck-module is provided with groove, and an end of described conductive unit extends in groove, and the leading edge of described conductive unit does not exceed the front end face of groove.
4. gradient coil termination as claimed in claim 3, it is characterized in that, the other end of described conductive unit stretches out from described stuck-module.
5. gradient coil termination as claimed in claim 3, is characterized in that, described groove be divided into some groups and with described conductive unit one_to_one corresponding, be provided with spacer portion between adjacent grooves.
6. gradient coil termination as claimed in claim 5, it is characterized in that, groove with the end place of group conductive unit is separated by the first spacer portion, by the second spacer portion separately, the width of described first spacer portion is less than the width between the second spacer portion to the groove at the end place of different group conductive unit.
7. gradient coil termination as claimed in claim 1, it is characterized in that, the two ends of described conductive unit are provided with connecting hole, and described conductive unit is arranged to different length according to described stuck-module from the extension line of described gradient coil.
8. gradient coil termination as claimed in claim 1, it is characterized in that, described stuck-module is formed by being cast in by insulating material on described conductive unit, and described conductive unit is packaged together in described stuck-module solidification process.
9. a magnetic resonance system, comprise gradient coil termination, shell, be built in gradient coil in shell and gradient amplifies power supply, described gradient coil termination includes stuck-module and conductive unit, described stuck-module is fixing on the housing, described conductive unit and described stuck-module are packaged together, and described conductive unit has two opposing end portions exposing stuck-module, amplifies power supply be respectively connected with gradient coil and gradient.
10. magnetic resonance system as claimed in claim 9, it is characterized in that, also comprise the temperature induction unit being arranged on described stuck-module inside, for monitoring described conductive unit by temperature during electric current, the temperature information that described temperature induction unit obtains is sent to data processing unit by transmission cable; Described data processing unit is installed on shell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520860184.9U CN205120950U (en) | 2015-10-30 | 2015-10-30 | Gradient coil termination and magnetic resonance system |
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| CN201520860184.9U CN205120950U (en) | 2015-10-30 | 2015-10-30 | Gradient coil termination and magnetic resonance system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2541541A (en) * | 2015-08-07 | 2017-02-22 | Gen Electric | Connection system and method |
| CN112578324A (en) * | 2019-09-29 | 2021-03-30 | 西门子(深圳)磁共振有限公司 | Gradient coil assembly and magnetic resonance imaging system |
| WO2024067733A1 (en) * | 2022-09-29 | 2024-04-04 | United Imaging Research Institute of Innovative Medical Equipment | Power supply assembly of gradient coil and magnetic resonance imaging system |
-
2015
- 2015-10-30 CN CN201520860184.9U patent/CN205120950U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2541541A (en) * | 2015-08-07 | 2017-02-22 | Gen Electric | Connection system and method |
| GB2541541B (en) * | 2015-08-07 | 2018-10-10 | Gen Electric | System for connecting MRI gradient coil to current cable |
| US10114092B2 (en) | 2015-08-07 | 2018-10-30 | General Electric Company | Connection system and method |
| CN112578324A (en) * | 2019-09-29 | 2021-03-30 | 西门子(深圳)磁共振有限公司 | Gradient coil assembly and magnetic resonance imaging system |
| CN112578324B (en) * | 2019-09-29 | 2024-03-19 | 西门子(深圳)磁共振有限公司 | Gradient coil assembly and magnetic resonance imaging system |
| WO2024067733A1 (en) * | 2022-09-29 | 2024-04-04 | United Imaging Research Institute of Innovative Medical Equipment | Power supply assembly of gradient coil and magnetic resonance imaging system |
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Address after: 201807 Shanghai city Jiading District Industrial Zone Jiading Road No. 2258 Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201807 Shanghai city Jiading District Industrial Zone Jiading Road No. 2258 Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |