CN102360692A - 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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- CN102360692A CN102360692A CN2011102244083A CN201110224408A CN102360692A CN 102360692 A CN102360692 A CN 102360692A CN 2011102244083 A CN2011102244083 A CN 2011102244083A CN 201110224408 A CN201110224408 A CN 201110224408A CN 102360692 A CN102360692 A CN 102360692A
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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 the superconduction electrical technology field, particularly a kind of high-temperature superconducting magnet that is used for magnetic resonance imaging system.
Background technology
Superconducting magnet is mainly used in the magnetic resonance imaging system, is the important diagnostic equipment in the medical field.Generally use cryogenic superconductor making cryogenic magnets such as NbTi in the magnetic resonance imaging system.The magnetic field of this type magnet generally between 1.0T-3.0T, is commonly referred to as high field magnet.Also have individually and use this cryogenic magnet to make the downfield magnet.Usually use permanent magnet to make the low field magnet of 0.2T-0.5T.Along with the rare earth material in the permanent magnetic material neodymium iron boron significantly appreciates, the cost of a low permanent-magnet is increasingly high.The using value of high-temperature superconducting magnet displays gradually.
High-temperature superconducting magnet generally uses MgB
2(magnesium diboride) superconducting line, Bi (bismuth) are that superconducting line or second generation Y (yttrium) are the superconducting line manufacturing.These superconducting wires are usually operated between the 10K-100K temperature, are called as high-temperature superconductor.Because the high-temperature superconductor electromagnetic performance is not fine, in only being used for usually making, low field magnet.Because the high-temperature superconducting magnet heat-insulation system simply, does not use expensive refrigerants such as liquid helium, system's manufacturing, operating cost are very economical.
Low field magnet generally adopts iron core to make magnetic circuit to improve system's magnetic property.Receive the weight ratio of iron core limit magnet bigger.Generally the imaging space both sides all are equipped with the shimming pole plate in magnetic field.The shape of shimming pole plate directly has influence on the uniformity of imaging magnetic field and the performance of systems such as radio frequency, gradient magnetic.Such imaging magnetic field space is generally opening (Open), is convenient to carry out operations such as PCI.It is more distinctive a kind of form in the multiple magnetic resonance imaging system.
Summary of the invention
The object of the invention is to provide a kind of high-temperature superconducting magnet that is used for magnetic resonance imaging system.
Technical scheme of the present invention is: a kind of high-temperature superconducting magnet that is used 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.
Said iron yoke adopts ferromagnetic material, constitutes C shape by two cantilevers and column.The 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 the superconduction winding.The selection of iron yoke sectional area size will guarantee that the inner magnet induction is no more than 2T.Near the superconduction winding structural design will guarantee that the magnetic field in the winding is no more than the requirement of superconductor operate as normal index.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.
Said conducting magnetic column adopts cylindrical; Adopt well behaved ferromagnetic material; Employing is processed two cantilever inboards that one or removably are arranged on the iron yoke with the iron yoke; The diameter of conducting magnetic column is less than the diameter of shimming pole plate, and conducting magnetic column mainly is to guide the interior magnetic line of force of iron yoke to gather on the shimming pole plate central shaft with the form of symmetry, thereby makes the shimming pole plate produce uniform magnetic field.
Said shimming pole plate adopts patty, adopts well behaved ferromagnetic material, is installed on the conducting magnetic column, and the space between the shimming pole plate is space to be detected, and the monitoring space scale will satisfy inspected object (such as human body or limbs) magnetic resonance imaging requirement; The shimming pole plate simultaneously is nested on the conducting magnetic column, and another side need be processed into concave surface.The concave surface size will help producing uniform magnetic field.Can place meticulousr shimming sheet in the concave surface, carry out the high accuracy shimming.Can also settle other electronic equipment relevant, equipment and material in the concave surface with magnetic resonance imaging.
Said refrigeration machine is installed on the low-temperature (low temperature) vessel, and cold head links to each other with the high-temperature superconductor winding, for the high-temperature superconductor winding provides low temperature environment, also disposes other electric interfaces and precooling liquid interface on the low-temperature (low temperature) vessel; Refrigeration machine is the capital equipment of cooling, and refrigeration machine secondary cold head links to each other with the high-temperature superconductor winding, is used for the temperature of superconducting coil winding is reduced to the working temperature of 10K-100K.Reach after the working temperature, refrigeration machine is used to keep the system works temperature.For the conduction cooling magnet that uses refrigeration machine, temperature-fall period is veryer long, usually uses cryogenic liquids such as liquid nitrogen or liquid helium through conduit the high-temperature superconductor winding to be quickened cooling.
Said low-temperature (low temperature) vessel is the cylindrical shape of hollow; Be 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 the superconduction winding to be in the low-temperature working environment.Shell adopts stainless steel material usually, and higher vacuum state will be kept in inside, reduces gas heat-transfer.The inner cover and the cold screen of the metal-back of the same undersized of shell shape of settling usually of low-temperature (low temperature) vessel.Cold screen temperature is slightly higher than superconduction winding, is used to block the heat of shell to internal radiation.The inner surface of 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 the low-temperature (low temperature) vessel.
Said high-temperature superconductor winding adopts at least one cover high-temperature superconductor winding for producing the critical component in magnetic field in the low-temperature (low temperature) vessel, the high-temperature superconductor winding adopts MgB
2, Bi be superconduction to or working temperature such as second generation Y system be higher than the high-temperature superconductor wire strip coiling of 4.2K; Be arranged on low-temperature (low temperature) vessel inside; Be connected through bracing frame between superconduction winding and the low-temperature (low temperature) vessel, high-temperature superconductor winding internal configurations has temperature sensor, quench detector and quench heater.
Support frame as described above is used for fixing the high-temperature superconductor winding.For keeping the superconduction winding good thermal insulation to be arranged 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 suspension rod type bracing frame, and addendum cone type bracing frame can adopt material such as the epoxy resin of poor heat conductivity etc., and the suspension rod type bracing frame of suspention high-temperature superconductor winding can adopt relatively poor material of heat conduction such as stainless steel etc.
Said binary current lead mainly is in the electric current guiding entering superconduction winding with external power source, need 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 links to each other with the refrigeration machine cold head; Binary current lead contacts a side and adopts superconductor with low temperature; Superconductor one end of binary current lead links to each other with refrigeration machine cold head temperature higher point, and the other end links to each other than low side with refrigeration machine cold head temperature.Said superconduction power supply is supplied power to the high-temperature superconductor winding through binary current lead.
Said quench observation circuit is monitored the operating state of superconduction winding at any time.In case appearance temperature condition variation, power failure etc. possibly cause the problem that the superconduction winding can't operate as normal, the superconduction protection system will initiatively discharge the electromagnetic energy in the superconduction winding, avoid permanent damage.
Beneficial effect:The high-temperature superconductive magnet system that the present invention simplifies possesses the cost advantage similar with traditional permanent magnet system.Compare with traditional double winding superconducting magnet, adopt single high-temperature superconductor winding to save cover refrigerator system, low-temperature (low temperature) vessel and an 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.
Description of drawings
Fig. 1 is a high-temperature superconducting magnet complete structure sketch map of the present invention;
Fig. 2 is high-temperature superconducting magnet iron yoke of the present invention and cryogenic system embodiment sketch map;
Fig. 3 is one of a high-temperature superconducting magnet cryogenic system inner supporting structure embodiment of the present invention sketch map;
Fig. 4 is two sketch mapes of high-temperature superconducting magnet cryogenic system inner supporting structure embodiment of the present invention;
Among the figure: 1 iron yoke, 2 conducting magnetic columns, 3 shimming pole plates, 4 spaces to be detected, 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 suspension rod type bracing frames, 12 support bars, 13 superconduction power supplys, the monitoring of 14 quench and protective circuit.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing the present invention is specified.
A kind of high-temperature superconducting magnet that is used 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, and as shown in Figure 1.
The good cylindrical conducting magnetic column 2 of ferromagnetic property is arranged on two cantilever inboards of the C shape iron yoke made from ferromagnetic material 1; The diameter of conducting magnetic column 2 is less than the diameter of shimming pole plate 3; Patty shimming pole plate 3 is installed on the conducting magnetic column 2; Shimming pole plate 3 one sides are nested on the conducting magnetic column 2, and another side is processed into concave surface.Space between the shimming pole plate 3 is space 4 to be detected, and its yardstick will be even as big as satisfying 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 equipped 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 the low-temperature (low temperature) vessel 6.
High-temperature superconductor winding 7 is arranged on low-temperature (low temperature) vessel 6 inside, is connected through bracing frame 8 between superconduction winding 7 and the low-temperature (low temperature) vessel 6, 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 links to each other with the refrigeration machine cold head; Binary current lead contacts a side and adopts superconductor with low temperature; Superconductor one end of binary current lead 9 links to each other with refrigeration machine cold head temperature higher point, and the other end links to each other than low side with refrigeration machine cold head temperature.
Bracing frame is used for fixing the high-temperature superconductor winding, is delivered to gravity and electromagnetic force the outside of low-temperature (low temperature) vessel 6; Binary current lead 9 is used to connect superconduction power supply 13 and quench monitoring and protective circuit 14 electric equipments such as grade.Superconduction power supply 13 can adopt commercially available special high stable superconduction power supply finished product.The quench monitoring can be adopted off-the-shelf hardware with protective circuit 14 electric equipments such as grade, also can make in addition with ball bearing made using.Also dispose other essential electric interfaces and precooling liquid interface on the low-temperature (low temperature) vessel 6.
Present embodiment is the high-temperature superconducting magnet of magnetic field intensity 0.3T, and is as shown in Figure 2.For high-temperature superconductor winding 7, if the wire strip operating current is 100A, approximately need 2000 circles, total length is about 5km, and the magnetic field in the 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, and the upper cantilever that is installed in iron yoke 1 is inboard, shown in Fig. 2 the first half.Shown in Fig. 2 the latter half, conducting magnetic column 2 also can be connected to the cantilever inboard of iron yoke 1 with iron yoke 1 being made of one structure.About 2.7 meters of iron yoke total length, about 1.5 meters of width, highly about 1.2 meters.
Because the superconduction winding adds after the 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 the superconduction winding good thermal insulation to be arranged 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 suspension rod type bracing frame 11; The material of addendum cone type bracing frame employing poor heat conductivity such as epoxy resin etc.; As shown in Figure 3, the suspension rod type bracing frame of suspention high-temperature superconductor winding adopts relatively poor material of heat conduction such as stainless steel etc., and is as shown in Figure 4.
Claims (6)
1. a high-temperature superconducting magnet that is used for magnetic resonance imaging system is characterized in that: comprise 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;
Said conducting magnetic column is arranged on two cantilever inboards of iron yoke, and the diameter of conducting magnetic column is less than the diameter of shimming pole plate, and the shimming pole plate is installed on the conducting magnetic column, and the shimming pole plate simultaneously is nested on the conducting magnetic column, and another side is processed into concave surface;
Said low-temperature (low temperature) vessel is enclosed on the column of iron yoke, and low-temperature (low temperature) vessel positioned inside high-temperature superconductor winding is equipped with the pipe interface that refrigeration machine, power supply, detection of electrons and control signal line interface and cryogenic liquid pass in and out on the low-temperature (low temperature) vessel;
Said refrigeration machine is installed on the low-temperature (low temperature) vessel, and the refrigeration machine cold head links to each other with the high-temperature superconductor winding;
Said high-temperature superconductor winding is arranged on low-temperature (low temperature) vessel inside, is connected through bracing frame between superconduction winding and the low-temperature (low temperature) vessel, and high-temperature superconductor winding internal configurations has temperature sensor, quench detector and quench heater;
Said binary current lead contacts a side and adopts plain conductor with room temperature; Plain conductor one end links to each other with the refrigeration machine cold head; Binary current lead contacts a side and adopts superconductor with low temperature; Superconductor one end of binary current lead links to each other with refrigeration machine cold head temperature higher point, and the other end links to each other than low side with refrigeration machine cold head temperature.
2. the high-temperature superconducting magnet that is used for magnetic resonance imaging system according to claim 1 is characterized in that: said superconduction power supply is supplied power to the high-temperature superconductor winding through binary current lead.
3. the high-temperature superconducting magnet that is used for magnetic resonance imaging system according to claim 1 is characterized in that: in a low-temperature (low temperature) vessel, adopt at least one cover high-temperature superconductor winding, the high-temperature superconductor winding adopts MgB
2, Bi is that superconducting line or second generation Y are the superconducting line strips coiling, the working temperature of superconducting line is higher than 4.2K.
4. the high-temperature superconducting magnet that is used for magnetic resonance imaging system according to claim 1 is characterized in that: said conducting magnetic column adopts with the iron yoke and processes two cantilever inboards that one or removably are arranged on the iron yoke.
5. the high-temperature superconducting magnet that is used for magnetic resonance imaging system according to claim 1 is characterized in that: can between two cantilevers of said iron yoke or between two shimming pole plates, increase non magnetic support bar.
6. the high-temperature superconducting magnet that is used for magnetic resonance imaging system according to claim 1 is characterized in that: the cold screen of a cover metal-back can be settled in said low-temperature (low temperature) vessel inside, and the inner surface of inside and outside surface of cold screen and shell all wraps up radiation protective film.
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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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104217838A (en) * | 2014-09-19 | 2014-12-17 | 西安聚能超导磁体科技有限公司 | Composite pluggable current lead socket |
| CN106218429A (en) * | 2016-08-03 | 2016-12-14 | 中国地质大学（武汉） | Superconduction emission type electric motor car wireless charging system |
| CN108107385A (en) * | 2017-12-22 | 2018-06-01 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of high-temperature superconducting magnet performance detecting system and detection method |
| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104217838A (en) * | 2014-09-19 | 2014-12-17 | 西安聚能超导磁体科技有限公司 | Composite pluggable current lead socket |
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| CN106218429A (en) * | 2016-08-03 | 2016-12-14 | 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 |
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| CN108107385A (en) * | 2017-12-22 | 2018-06-01 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of high-temperature superconducting magnet performance detecting system and detection method |
| 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 |
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