CN102360692B - High temperature superconducting magnet for magnetic resonance imaging system - Google Patents
High temperature superconducting magnet for magnetic resonance imaging system Download PDFInfo
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- 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
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000004804 winding Methods 0.000 claims abstract description 55
- 229910052742 iron Inorganic materials 0.000 claims abstract description 30
- 230000005291 magnetic effect Effects 0.000 claims description 43
- 239000002887 superconductor Substances 0.000 claims description 40
- 238000005057 refrigeration Methods 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 6
- 239000003302 ferromagnetic material Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- PZKRHHZKOQZHIO-UHFFFAOYSA-N [B].[B].[Mg] Chemical compound [B].[B].[Mg] PZKRHHZKOQZHIO-UHFFFAOYSA-N 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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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.
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| CN201110224408.3A CN102360692B (en) | 2011-08-05 | 2011-08-05 | High temperature superconducting magnet for magnetic resonance imaging system |
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| CN201110224408.3A CN102360692B (en) | 2011-08-05 | 2011-08-05 | High temperature superconducting magnet for magnetic resonance imaging system |
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| CN102360692B true CN102360692B (en) | 2014-03-26 |
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| US10984935B2 (en) | 2017-05-02 | 2021-04-20 | Hefei Institutes Of Physical Science, Chinese Academy Of Sciences | Superconducting dipole magnet structure for particle deflection |
| 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 | Device and method for active energy release of non-contact superconducting magnet based on magnetic circuit coupling |
| CN110957101A (en) * | 2019-12-19 | 2020-04-03 | 西部超导材料科技股份有限公司 | Conduction cooling closed loop saddle-shaped magnetic control single crystal pulling superconducting magnet device |
| CN111009375A (en) * | 2019-12-19 | 2020-04-14 | 西部超导材料科技股份有限公司 | Conduction cooling magnetic control single crystal pulling superconducting magnet device |
| CN113126009B (en) * | 2021-01-25 | 2024-12-17 | 西安聚能超导磁体科技有限公司 | A direct-cooling high-temperature superconducting magnet test platform and assembly method |
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|---|---|---|---|---|
| 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 superconducting strong magnetic iron remover |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH01262605A (en) * | 1988-04-14 | 1989-10-19 | Toshiba Corp | Superconductive magnet device |
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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 superconducting strong magnetic iron remover |
Non-Patent Citations (1)
| Title |
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| JP平1-262605A 1989.10.19 |
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