CN102360692B - High temperature superconducting magnet for magnetic resonance imaging system - Google Patents
High temperature superconducting magnet for magnetic resonance imaging system Download PDFInfo
- Publication number
- CN102360692B CN102360692B CN201110224408.3A CN201110224408A CN102360692B CN 102360692 B CN102360692 B CN 102360692B CN 201110224408 A CN201110224408 A CN 201110224408A CN 102360692 B CN102360692 B CN 102360692B
- Authority
- CN
- China
- Prior art keywords
- temperature
- low
- high temperature
- iron yoke
- winding
- 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 - Fee Related
Links
Images
Abstract
The invention discloses a high temperature superconducting magnet for a magnetic resonance imaging system. The high temperature superconducting magnet comprises an iron yoke, magnetizing columns, shimming polar plates, a refrigerating machine, a low temperature container, a high temperature superconducting winding, a supporting frame and two binary current lead wires, wherein the magnetizing columns are arranged on the inner sides of two cantilevers of the iron yoke; the shimming polar plates are arranged on the magnetizing columns; one surface of each shimming polar plate is embedded in the corresponding magnetizing column and the other surface of each shimming polar plate is required to be processed into a concave surface; the low temperature container encircles a stand column of the iron yoke; the high temperature superconducting winding is arranged inside the low temperature container; the refrigerating machine is arranged on the low temperature container; a secondary cooling head of the refrigerating machine is connected with the high temperature superconducting winding; the high temperature superconducting winding is arranged inside the low temperature container; the high temperature superconducting winding is connected with the low temperature container through the supporting frame; the two binary current lead wires are connected with the cooling heads of the refrigerating machine; and the binary current lead wires are used for leading current of a superconducting power supply into the high temperature superconducting winding. The high temperature superconducting magnet fully develops the advantage of high economic benefit; and the high temperature superconducting magnet with a creative design has the efficiency advantage which is the same as that of a permanent magnet.
Description
Technical field
The invention belongs to superconduction electrical technology field, particularly a kind of high-temperature superconducting magnet for magnetic resonance imaging system.
Background technology
Superconducting magnet is mainly used in magnetic resonance imaging system, is the important diagnostic equipment in medical field.The general cryogenic superconductor making cryogenic magnets such as NbTi that use in magnetic resonance imaging system.The magnetic field, in general of this class magnet, between 1.0T-3.0T, is commonly referred to as high field magnet.Also have individually and use this cryogenic magnet to make downfield magnet.Conventionally use permanent magnet to make the low field magnet of 0.2T-0.5T.Along with the rare earth material in permanent magnetic material neodymium iron boron significantly appreciates, the cost of low permanent-magnet is more and more higher.The using value of high-temperature superconducting magnet displays gradually.
High-temperature superconducting magnet is generally used MgB
2(magnesium diboride) superconducting line, Bi(bismuth) be that superconducting line or second generation Y (yttrium) they are superconducting line manufacture.These superconducting wires are usually operated between 10K-100K temperature, are called as high-temperature superconductor.Because high-temperature superconductor electromagnetic performance is not fine, in being conventionally only used for making, low field magnet.Because high-temperature superconducting magnet heat-insulation system simply, is not used the refrigerant that liquid helium etc. is expensive, system manufacture, operating cost are very economical.
Low field magnet generally adopts iron core to make magnetic circuit to improve system magnetic property.Be subject to the weight ratio of iron core limit magnet larger.Generally in imaging space both sides, magnetic field, be all equipped with shimming pole plate.The shape of shimming pole plate directly has influence on the uniformity of imaging magnetic field and the performance of the system such as radio frequency, gradient magnetic.Such imaging magnetic field space is generally opening (Open), is convenient to carry out the operations such as interventional therapy.It is more distinctive a kind of form in multiple magnetic resonance imaging system.
Summary of the invention
The object of the invention is to provide a kind of high-temperature superconducting magnet for magnetic resonance imaging system.
Technical scheme of the present invention is: a kind of high-temperature superconducting magnet for magnetic resonance imaging system, comprises iron yoke, conducting magnetic column, shimming pole plate, refrigeration machine, low-temperature (low temperature) vessel, high-temperature superconductor winding, bracing frame and binary current lead.
Described iron yoke adopts ferromagnetic material, by two cantilevers and column, forms C shape.Iron yoke is the leading magnetic loop of magnet system, and low-temperature (low temperature) vessel is enclosed on the column of iron yoke, is mainly used in the magnetic flux that conduction is produced by superconduction winding.The selection of iron yoke sectional area size will guarantee that inner magnet induction is no more than 2T.Near structural design superconduction winding, guarantee that the magnetic field in winding is no more than the requirement of the normal working index of superconductor.In order to strengthen the fail safe of force structure, can be between two cantilevers of iron yoke, or between two shimming pole plates, increase non magnetic support bar.
Described conducting magnetic column adopts cylindrical, adopt well behaved ferromagnetic material, employing makes with iron yoke two cantilevers inner sides that one or removably are arranged on iron yoke, the diameter of conducting magnetic column is less than the diameter of shimming pole plate, conducting magnetic column is mainly that the magnetic line of force in guiding iron yoke gathers on shimming pole plate central shaft with symmetrical form, thereby makes shimming pole plate produce uniform magnetic field.
Described shimming pole plate adopts patty, adopts well behaved ferromagnetic material, is arranged on conducting magnetic column, and the space between shimming pole plate is detected space, monitors space scale and will meet inspected object (such as human body or limbs) magnetic resonance imaging requirement; Shimming pole plate is simultaneously nested on conducting magnetic column, and another side need to be processed into concave surface.Concave surface size will be conducive to produce uniform magnetic field.In concave surface, can place meticulousr shimming sheet, carry out high accuracy shimming.In concave surface, can also settle other electronic equipment relevant to magnetic resonance imaging, equipment and material.
Described refrigeration machine is installed on low-temperature (low temperature) vessel, and cold head is connected with high-temperature superconductor winding, for high-temperature superconductor winding provides low temperature environment, also disposes other electric interfaces and precooling liquid interface on low-temperature (low temperature) vessel; Refrigeration machine is the capital equipment of cooling, and refrigeration machine secondary cold head is connected with high-temperature superconductor winding, for the temperature of superconducting coil winding being reduced to the working temperature of 10K-100K.After reaching working temperature, refrigeration machine is used for maintaining system works temperature.For the cooling magnet of conduction that uses refrigeration machine, temperature-fall period is veryer long, usually uses the cryogenic liquids such as liquid nitrogen or liquid helium, by conduit, high-temperature superconductor winding is accelerated to cooling.
Described low-temperature (low temperature) vessel is the cylindrical shape of hollow, vacuum-tight container, positioned inside high-temperature superconductor winding, the inner refrigeration machine that adopts of low-temperature (low temperature) vessel conducts methods for cooling work, in initial temperature-fall period, use cryogenic liquid to carry out auxiliary temperature-reducing, keep superconduction winding in low-temperature working environment.Shell adopts stainless steel material conventionally, and inside will maintain higher vacuum state, reduces gas heat-transfer.The inner cold screen of metal-back a set of and the same undersized of shell shape of conventionally settling of low-temperature (low temperature) vessel.Cold screen temperature is slightly higher than superconduction winding, for blocking shell to the heat of internal radiation.The inner surface of the inside and outside surface of cold screen and shell all wraps up radiation protective film to reduce thermal radiation.The pipe interface of refrigeration machine, power supply, detection of electrons and control signal line interface and cryogenic liquid turnover is installed on low-temperature (low temperature) vessel.
Described high-temperature superconductor winding, for producing the critical component in magnetic field, adopts at least a set of high-temperature superconductor winding in a low-temperature (low temperature) vessel, high-temperature superconductor winding adopts MgB
2, Bi be superconduction to or the working temperature such as second generation Y system higher than the high-temperature superconductor wire strip coiling of 4.2K, be arranged on low-temperature (low temperature) vessel inside, between superconduction winding and low-temperature (low temperature) vessel, by bracing frame, be connected, high-temperature superconductor winding internal configurations has temperature sensor, quench detector and quench heater.
Support frame as described above is used for fixedly high-temperature superconductor winding.For keeping superconduction winding to have good thermal insulation with outside, bear the gravity of superconduction winding and the magnetic field force in the course of work simultaneously, bracing frame is necessary strong and heat conduction amount is as far as possible little.Bracing frame can adopt addendum cone type bracing frame or suspender bracing frame, and the material that addendum cone type bracing frame can adopt poor heat conductivity is as epoxy resin etc., and the suspender bracing frame of suspention high-temperature superconductor winding can adopt the poor material of heat conduction as stainless steel etc.
Described binary current lead is mainly that the electric current guiding of external power source is entered in superconduction winding, needs to reduce importing into of heat simultaneously as far as possible.Binary current lead contacts a side and adopts plain conductor with room temperature, plain conductor one end is connected with refrigeration machine cold head, binary current lead contacts a side and adopts superconductor with low temperature, superconductor one end of binary current lead is connected with refrigeration machine cold head temperature higher point, and the other end is connected compared with low side with refrigeration machine cold head temperature.Described superconduction power supply is powered to high-temperature superconductor winding by binary current lead.
Described quench observation circuit is monitored the operating state of superconduction winding at any time.Once occur the problem that temperature conditions variation, power failure etc. may cause superconduction winding normally to work, superconduction protection system, by the electromagnetic energy initiatively discharging in superconduction winding, is avoided permanent damage.
beneficial effect:the high-temperature superconductive magnet system that the present invention simplifies possesses the cost advantage similar to traditional permanent magnet system.Compare with traditional double winding superconducting magnet, adopt single high-temperature superconductor winding to save a set of refrigerator system, low-temperature (low temperature) vessel and electronic system, the overall economy of magnet system is significantly improved.Conducting magnetic column and shimming electrode plate structure have very great help to producing uniform magnetic field.
Accompanying drawing explanation
Fig. 1 is high-temperature superconducting magnet complete structure schematic diagram of the present invention;
Fig. 2 is high-temperature superconducting magnet iron yoke of the present invention and cryogenic system embodiment schematic diagram;
Fig. 3 is one of high-temperature superconducting magnet cryogenic system inner supporting structure embodiment of the present invention schematic diagram;
Fig. 4 is two schematic diagrames of high-temperature superconducting magnet cryogenic system inner supporting structure embodiment of the present invention;
In figure: 1 iron yoke, 2 conducting magnetic columns, 3 shimming pole plates, 4 detected spaces, 5 refrigeration machines, 6 low-temperature (low temperature) vessels, 7 high-temperature superconductor windings, 8 addendum cone type bracing frames, 9 binary current leads, 10 protective shield of radiations, 11 suspender bracing frames, 12 support bars, 13 superconduction power supplys, 14 quench monitoring and protective circuits.
Embodiment
Below in conjunction with specific embodiments and the drawings, the present invention is described in detail.
A high-temperature superconducting magnet for magnetic resonance imaging system, is characterized in that: comprise iron yoke 1, conducting magnetic column 2, shimming pole plate 3, refrigeration machine 5, low-temperature (low temperature) vessel 6, high-temperature superconductor winding 7, bracing frame and binary current lead 9, as shown in Figure 1.
The good cylindrical conducting magnetic column 2 of ferromagnetic property is arranged on two cantilever inner sides of the C shape iron yoke 1 of manufacturing with ferromagnetic material, the diameter of conducting magnetic column 2 is less than the diameter of shimming pole plate 3, patty shimming pole plate 3 is arranged on conducting magnetic column 2, shimming pole plate 3 one sides are nested on conducting magnetic column 2, and another side is processed into concave surface.Space between shimming pole plate 3 is detected space 4, and its yardstick will be even as big as meeting inspected object (such as human body or limbs) magnetic resonance imaging requirement.
Low-temperature (low temperature) vessel 6 is enclosed on the column of iron yoke 1, and low-temperature (low temperature) vessel 6 positioned inside high-temperature superconductor windings 7 are provided with the pipe interface that refrigeration machine 5, power supply, detection of electrons and control signal line interface and cryogenic liquid pass in and out on low-temperature (low temperature) vessel 6.
Refrigeration machine 5 is installed on low-temperature (low temperature) vessel 6, and refrigeration machine 5 secondary cold heads are connected with high-temperature superconductor winding 7, adopts RD415 type GM refrigeration machine, for high-temperature superconductor winding 7 provides enough low temperature environment.
High-temperature superconductor winding 7 is arranged on low-temperature (low temperature) vessel 6 inside, between superconduction winding 7 and low-temperature (low temperature) vessel 6, by bracing frame 8, is connected, and high-temperature superconductor winding 7 internal configurations have temperature sensor, quench detector and quench heater.
Binary current lead 9 contacts a side and adopts plain conductor with room temperature, plain conductor one end is connected with refrigeration machine cold head, binary current lead contacts a side and adopts superconductor with low temperature, superconductor one end of binary current lead 9 is connected with refrigeration machine cold head temperature higher point, and the other end is connected compared with low side with refrigeration machine cold head temperature.
Bracing frame is used for fixing high-temperature superconductor winding, gravity and electromagnetic force is delivered to the outside of low-temperature (low temperature) vessel 6; Binary current lead 9 is for connecting the electric equipments such as superconduction power supply 13 and quench monitoring and protective circuit 14.Superconduction power supply 13 can adopt commercially available special high stable superconduction power supply finished product.Quench monitoring can adopt off-the-shelf hardware with protective circuit 14 electric equipments such as grade, also can make in addition by ball bearing made using.On low-temperature (low temperature) vessel 6, also dispose other essential electric interfaces and precooling liquid interface.
The present embodiment is the high-temperature superconducting magnet of magnetic field intensity 0.3T, as shown in Figure 2.For high-temperature superconductor winding 7, if wire strip operating current is 100A, approximately need 2000 circles, total length is in 5km left and right, and the magnetic field in winding is no more than 0.3T.For the ease of the assembling of low-temperature (low temperature) vessel 6, the upper cantilever of iron yoke 1 can be made demountable structure, and conducting magnetic column 2 can be made demountable structure, is arranged on the upper cantilever inner side of iron yoke 1, as shown in Fig. 2 the first half.As shown in Fig. 2 the latter half, conducting magnetic column 2 also can be connected to iron yoke 1 being made of one structure the cantilever inner side of iron yoke 1.Approximately 2.7 meters of iron yoke total lengths, approximately 1.5 meters of width, highly approximately 1.2 meters.
Because after superconduction winding adds operating current, between two shimming pole plates 3, can produce king-sized attraction.In order to strengthen the fail safe of force structure, can be between two cantilevers of iron yoke 1, or between two shimming pole plates 3, increase non magnetic support bar 12.
For keeping superconduction winding to have good thermal insulation with outside, bear the gravity of superconduction winding and the magnetic field force in the course of work simultaneously, supporting construction is necessary strong and heat conduction amount is as far as possible little.Bracing frame of the present invention adopts addendum cone type bracing frame 8 or suspender bracing frame 11, the material that addendum cone type bracing frame adopts poor heat conductivity is as epoxy resin etc., as shown in Figure 3, the suspender bracing frame of suspention high-temperature superconductor winding adopts the poor material of heat conduction as stainless steel etc., as shown in Figure 4.
Claims (2)
1. the high-temperature superconducting magnet for magnetic resonance imaging system, comprise iron yoke, conducting magnetic column, shimming pole plate, high-temperature superconductor winding, low-temperature (low temperature) vessel, binary current lead, bracing frame and refrigeration machine, conducting magnetic column is arranged on two cantilever inner sides of iron yoke, low-temperature (low temperature) vessel positioned inside high-temperature superconductor winding; Described low-temperature (low temperature) vessel is enclosed on the column of iron yoke, and the pipe interface of refrigeration machine, power supply, detection of electrons and control signal line interface and cryogenic liquid turnover is installed on low-temperature (low temperature) vessel; Described refrigeration machine is installed on low-temperature (low temperature) vessel, and refrigeration machine cold head is connected with high-temperature superconductor winding; Described high-temperature superconductor winding is arranged on low-temperature (low temperature) vessel inside, between superconduction winding and low-temperature (low temperature) vessel, by bracing frame, is connected, and high-temperature superconductor winding internal configurations has temperature sensor, quench detector and quench heater; Described binary current lead contacts a side and adopts plain conductor with room temperature, plain conductor one end is connected with refrigeration machine cold head, binary current lead contacts a side and adopts superconductor with low temperature, superconductor one end of binary current lead is connected with refrigeration machine cold head temperature higher point, and the other end is connected compared with low side with refrigeration machine cold head temperature;
It is characterized in that: described iron yoke adopts ferromagnetic material, by two cantilevers and column, forms C shape;
The diameter of described conducting magnetic column is less than the diameter of shimming pole plate, and shimming pole plate is arranged on conducting magnetic column, and shimming pole plate is simultaneously nested on conducting magnetic column, and another side is processed into concave surface;
Between two cantilevers of described iron yoke or increase non magnetic support bar between two shimming pole plates.
2. the high-temperature superconducting magnet for magnetic resonance imaging system according to claim 1, is characterized in that: described conducting magnetic column adopts with iron yoke and makes two cantilevers inner sides that one or removably are arranged on iron yoke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110224408.3A CN102360692B (en) | 2011-08-05 | 2011-08-05 | High temperature superconducting magnet for magnetic resonance imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110224408.3A CN102360692B (en) | 2011-08-05 | 2011-08-05 | High temperature superconducting magnet for magnetic resonance imaging system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102360692A CN102360692A (en) | 2012-02-22 |
| CN102360692B true CN102360692B (en) | 2014-03-26 |
Family
ID=45585991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110224408.3A Expired - Fee Related CN102360692B (en) | 2011-08-05 | 2011-08-05 | High temperature superconducting magnet for magnetic resonance imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102360692B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104217838B (en) * | 2014-09-19 | 2016-09-07 | 西安聚能超导磁体科技有限公司 | A kind of compound pluggable current feed socket |
| CN106218429B (en) * | 2016-08-03 | 2019-02-01 | 中国地质大学（武汉） | Superconduction emission type electric motor car wireless charging system |
| WO2018201279A1 (en) * | 2017-05-02 | 2018-11-08 | 中国科学院合肥物质科学研究院 | Superconducting dipole magnet structure, transport device, and medical apparatus |
| CN108107385B (en) * | 2017-12-22 | 2020-07-24 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | High-temperature superconducting magnet performance detection system and detection method |
| CN110428949B (en) * | 2019-08-07 | 2020-12-29 | 上海交通大学 | Magnetic circuit coupling-based active energy release device and method for non-contact superconducting magnet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5614880A (en) * | 1990-04-02 | 1997-03-25 | Elscint Ltd. | Superconducting magnet with symmetrical plural air gaps |
| CN1268756A (en) * | 1999-03-24 | 2000-10-04 | 浙江亚克科技有限公司 | High-temp. superconducting coil and its NMR spectrometer |
| CN101195108A (en) * | 2007-12-17 | 2008-06-11 | 山东华特磁电科技股份有限公司 | Low temperature superconductivity ferromagnetic deironing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01262605A (en) * | 1988-04-14 | 1989-10-19 | Toshiba Corp | Superconductive magnet device |
-
2011
- 2011-08-05 CN CN201110224408.3A patent/CN102360692B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5614880A (en) * | 1990-04-02 | 1997-03-25 | Elscint Ltd. | Superconducting magnet with symmetrical plural air gaps |
| CN1268756A (en) * | 1999-03-24 | 2000-10-04 | 浙江亚克科技有限公司 | High-temp. superconducting coil and its NMR spectrometer |
| CN101195108A (en) * | 2007-12-17 | 2008-06-11 | 山东华特磁电科技股份有限公司 | Low temperature superconductivity ferromagnetic deironing device |
Non-Patent Citations (1)
| Title |
|---|
| JP平1-262605A 1989.10.19 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102360692A (en) | 2012-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lvovsky et al. | Novel technologies and configurations of superconducting magnets for MRI | |
| CN102360692B (en) | High temperature superconducting magnet for magnetic resonance imaging system | |
| CN101373654B (en) | Heat pipe cooled superconducting magnets with ceramic coil forms | |
| CN101728051B (en) | High-field superconducting magnet system with wide separation gaps | |
| US8162037B2 (en) | Device for generating a pulsed magnetic field | |
| Liang et al. | Design of a 380 m DC HTS power cable | |
| CN102360689B (en) | Open type conduction cooling nuclear magnetic resonance superconducting magnet system | |
| CN102062844B (en) | Sub-cooled superconductor gradient coil module applicable to magnetic resonance imaging | |
| CN103336212B (en) | A kind of low-temperature superconducting strand Performance Test System | |
| WO2002059917A1 (en) | Liquid cryogen-free superconducting magnet system | |
| CN111863374A (en) | High-temperature superconducting uninsulated magnet | |
| JP2004349276A (en) | Superconducting permanent magnet unit | |
| CN203310943U (en) | Low-temperature superconducting strand performance test system | |
| CN210041676U (en) | High-temperature superconducting uninsulated magnet | |
| US20160180996A1 (en) | Superconducting magnet system | |
| Wang et al. | Development of high magnetic field superconducting magnet technology and applications in China | |
| CN204720270U (en) | A kind of superconducting magnet liquid helium container comprising vacuum chamber | |
| Choi et al. | Progress on the development of a 5 T HTS insert magnet for GHz class NMR applications | |
| CN104900370A (en) | Superconducting magnet liquid helium container comprising vacuum chamber | |
| CN212365633U (en) | Cooling system of liquid helium-free superconducting magnet | |
| Zbanik et al. | ALS superbend magnet system | |
| JP5920924B2 (en) | Superconducting magnet device and magnetic resonance imaging device | |
| Pooke et al. | HTS 5 tesla synchrotron and neutron beamline magnets | |
| Wang et al. | Design of a test cryomodule for IMP ADS-Injector II | |
| Green et al. | Refrigeration options for the advanced light source superbend dipole magnets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20150805 |
|
| EXPY | Termination of patent right or utility model |