CN105044634B - Magnetic resonance analysis permanent magnet device - Google Patents
Magnetic resonance analysis permanent magnet device Download PDFInfo
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- CN105044634B CN105044634B CN201510493004.2A CN201510493004A CN105044634B CN 105044634 B CN105044634 B CN 105044634B CN 201510493004 A CN201510493004 A CN 201510493004A CN 105044634 B CN105044634 B CN 105044634B
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- yoke
- thermal resistance
- thermostatic control
- pole plate
- adding thermal
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- 238000004458 analytical method Methods 0.000 title claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 230000010354 integration Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses magnetic resonance analysis permanent magnet device,Including yoke,Pole plate,Guide iron and shim coil plate,A pair of symmetrical pole plates are fixed with the yoke,The yoke surrounds the magnet loop of closing and the pole plate is located in the magnet loop,The shim coil plate is through the guiding ferropexy in the pole plate,Adding thermal resistance is fixed with the yoke,The adding thermal resistance is connected to thermostatic control power supply,The pole plate is provided with temperature sensor,Also include PID thermostatic control systems for adjusting the electric current of the adding thermal resistance to control magnetic field's regularity,The temperature sensor is connected with the PID thermostatic control systems,Shim coil plate,Shim power group and automatic shimming regulating system are connected to the PID thermostatic control systems,The PID thermostatic control systems adjust the operating current of the adding thermal resistance according to the compensation electric current of the shim coil plate.Magnetic resonance analysis permanent magnet device provided by the invention, magnet temperature is caused to change and magnetic field stability is deteriorated after can solving the problems, such as the increasing of coil heating amount.
Description
Technical field
The present invention relates to a kind of magnetic resonance analysis permanent magnet device.
Background technology
Magnet is the critical component in all NMR systems, or even is referred to as heart；Its key technical indexes has
Even property, stability and uniform area-wide etc.；Be used as nmr magnet at present mainly has superconducting magnet and permanent magnet.Superconduction
Magnet is expensive, and permanent magnet uniformity and stability have different.Therefore permanent magnet is needed to carry out shimming regulation, and shimming is adjusted
Section has several means, is magnet design first, next to that magnet steel technology controlling and process (including magnet steel particle uniformity and magnetization angle
Homogeneity, the homogeneity of magnet steel sintering temperature, the finish on magnet steel surface), it is that mechanical shimming (mainly adjusts magnet steel to put down again
Row degree and concentricity), it is passive shimming (pasting small magnetic sheet in magnetic pole plate face) again, is finally active shimming, that is, passes through application
The shim coil set of adjustable current come realize shimming adjust.
Active shimming technology is exactly to organize to be powered to the lead loop (shim coil) of special shape design, produces size along three
A series of small magnetic fields that dimension space direction is changed with certain rule, with the serial small magnetic field go to offset in former magnetic field it is various not
Uniform item, finally realize the homogenization in magnetic field.
When realizing a wide range of shimming, the electric current of required shimming is larger, causes coil heating amount to increase after electric current increase, line
The caloric value of circle, which increases, can make the magnet outside shim coil is heated to cause temperature change, so as to cause the stability in magnetic field to become
Difference, coil heating also results in the change of self-resistance in addition, and makes shimming effect uneven.
The content of the invention
In order to solve the problems of the prior art, it is an object of the present invention to provide a kind of magnetic resonance analysis permanent magnet device,
To solve the problems, such as that active shimming realizes that a wide range of shimming causes coil heating.
Based on above mentioned problem, technical scheme provided by the invention is：
Magnetic resonance analysis permanent magnet device, including yoke, pole plate, guiding iron and shim coil plate, on the yoke
A pair of symmetrical pole plates are fixed with, the yoke surrounds the magnet loop of closing and the pole plate is located at the magnet loop
Interior, the shim coil plate in the pole plate, is fixed with adding thermal resistance through the guiding ferropexy on the yoke, described
Adding thermal resistance is connected to thermostatic control power supply, and the pole plate is provided with temperature sensor, in addition to PID thermostatic control systems are used
In the electric current for adjusting the adding thermal resistance to control magnetic field's regularity, the temperature sensor and the PID thermostatic controls system
System connection, shim coil plate, shim power group and automatic shimming regulating system are connected to the PID thermostatic control systems, described
PID thermostatic control systems adjust the operating current of the adding thermal resistance according to the compensation electric current of the shim coil plate.
Further, ratio, integration and the differential parameter of pid algorithm pass through the temperature in the PID thermostatic control systems
Degree sensor measures the temperature of the magnetic pole plate surface to determine parameter value, in control process using final sets target value as
Function argument, obtain ratio, integration and differential parameter.
Further, in addition to magnet case, the yoke, pole plate, guiding iron and shim coil plate are placed in the magnetic
In body case.
Further, it is additionally provided with small fan by the adding thermal resistance.
Compared with prior art, it is an advantage of the invention that：
Using technical scheme, shim power group, automatic shimming regulating system and shim coil plate are connected to
In PID thermostatic control systems, the operating current of shim coil plate can be included in the constant-temperature heating system of yoke, by shim coil
Converting heat caused by plate is beneficial part, and solving coil heating amount in the prior art makes magnet is heated to cause temperature after increasing
The problem of changing and making magnetic field stability be deteriorated.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Accompanying drawing be briefly described, drawings in the following description are only some embodiments of the present invention, for the common skill in this area
For art personnel, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of magnetic resonance analysis permanent magnet device embodiment of the present invention；
Fig. 2 is the fundamental diagram of active shimming system in the prior art；
Fig. 3 is the operation principle schematic diagram of the present invention；
Wherein：1st, yoke；2nd, pole plate；3rd, iron is guided；4th, shim coil plate；5th, adding thermal resistance；6th, magnet case；7th, small wind
Fan.
Embodiment
Such scheme is described further below in conjunction with specific embodiment.It should be understood that these embodiments are to be used to illustrate
The present invention and be not limited to limit the scope of the present invention.The implementation condition used in embodiment can be done according to the condition of specific producer
Further adjustment, unreceipted implementation condition is usually the condition in normal experiment.
Be embodiments of the invention referring to Fig. 1, there is provided a kind of magnetic resonance analysis permanent magnet device, it include yoke 1,
Pole plate 2, iron 3 and shim coil plate 4 are guided, have the magnet loop that four pieces of yokes 1 surround closing in this example, it is solid on yoke 1
Surely there are a pair of symmetrical pole plates 2, pole plate 2 is respectively positioned in the magnet loop, and the channeled iron 3 of shim coil plate 4 is fixed on magnetic
On pole plate 2, yoke 1 and the guiding one side of iron 3 play fixed effect, and other hand can also realize closing to the magnetic line of force and
Homogenized effect；In order to realize the heating to pole plate 2, in the prior art, adding thermal resistance 5 is fixed with yoke 1, referring to Fig. 2,
The operating current It of adding thermal resistance 5 is controlled by PID thermostatic control systems, thermostatic control power supply connects through PID thermostatic control systems
To adding thermal resistance 5, and the operating current Is of shim coil plate 4 is controlled by automatic shimming regulating system and shim power group.
Active shimming generally requires larger electric current in a wide range of shimming, and larger electric current causes shim coil plate 4
Caused heat increase, the channeled iron 3 of heat caused by shim coil plate 4, which passes to pole plate 2, can cause the temperature of pole plate 2 to become
Change and magnetic field stability is deteriorated, in order to solve this problem, the operating current of shim coil plate 4 is introduced into pole plate in this example
In 2 thermostatic control system, PID thermostatic control systems adjust the work of adding thermal resistance according to the compensation electric current of shim coil plate
Electric current, the operating current for reducing adding thermal resistance 5 are that the heated at constant temperature to pole plate 2 can be achieved.
Specifically, referring to Fig. 3, thermostatic control power supply and shim power group are electric with heating respectively through PID thermostatic control systems
Resistance is connected with shim coil plate, and temperature sensor is provided with pole plate, and the temperature sensor connects with PID thermostatic control systems
Connect, pid control algorithm is integrated with PID thermostatic control systems, ratio, integration and the differential parameter of pid algorithm are passed by temperature
Sensor measures the temperature of magnetic pole plate surface to determine parameter value, using final sets target value as function from becoming in control process
Amount, obtains ratio, integration and differential parameter, and PID thermostatic control systems are the ratio (P) based on deviation, integration (I) and differential
(D) automatically adjust the device of control, is a kind of automatic controller being most widely used, its core is pid algorithm.Its from
Dispersion formula is：
U (K) is final control output quantity；
Wherein, proportion adjustment control coefrficient (KP), basic (current) the deviation e (k) of reaction system；Coefficient is big, Ke Yijia
Fast regulation, reduces error, but excessive ratio declines the stability of a system, or even causes system unstable；Integral adjustment coefficient
(KI), the Accumulated deviation of reaction systemSystem is eliminated steady-state error, improve no margin.As long as there is error, integration
Regulation is with regard to carrying out, until error free；Differential adjustment factor (KD), reflect rate of change e (k)-e (k-1) of system deviation signal, have
It is proactive, the trend of change of error can be predicted, produces advanced control action, it is micro- before deviation is also without formation
Divide adjustment effect to eliminate, therefore the dynamic property of system can be improved.But differential has amplification to noise jamming, strengthen micro-
It is unfavorable to system rejection to disturbance to divide.Integration and differential all can not individually work, it is necessary to control and coordinate with ratio.Will be even in the present invention
The electric current of field is included in ratio (KP) regulation part, that is, be included in e (K), to integrate (KI) and differential (KD) then maintain former coefficient not
Become.
PID thermostatic control systems are It- according to the compensation electric current Is of the shim coil plate operating currents for adjusting adding thermal resistance
Is, shim current is converted into beneficial part, can solve shim coil plate caloric value in the case of a wide range of shimming and be led after increasing
The problem of causing pole plate temperature change and reducing magnetic field homogeneity.
Also include magnet case 6 in this example, yoke 1, pole plate 2, guiding iron 3 and shim coil plate 4 are arranged at magnet
It is hedged off from the outer world in case 6.
Small fan 7 also is provided with the side of adding thermal resistance 5 in this example, so that even heat caused by adding thermal resistance heats magnetic
Pole plate 2.
The foregoing examples are merely illustrative of the technical concept and features of the invention, its object is to allow the person skilled in the art to be
Present disclosure can be understood and implemented according to this, it is not intended to limit the scope of the present invention.It is all smart according to the present invention
The equivalent transformation or modification that refreshing essence is done, should all be included within the scope of the present invention.
Claims (4)
1. magnetic resonance analysis permanent magnet device, including yoke (1), pole plate (2), guiding iron (3) and shim coil plate (4),
A pair of symmetrical pole plates (2) are fixed with the yoke (1), the yoke (1) surrounds the magnet loop of closing and the magnetic
Pole plate (2) is located in the magnet loop, and the shim coil plate (4) is fixed on the pole plate (2) through the guiding iron (3)
On, adding thermal resistance (5) is fixed with the yoke (1), the adding thermal resistance (5) is connected to thermostatic control power supply, the magnetic pole
Plate (2) is provided with temperature sensor (5), in addition to PID thermostatic control systems are used to adjust the electric current of the adding thermal resistance to control
Magnetic field's regularity processed, the temperature sensor are connected with the PID thermostatic control systems, it is characterised in that：Shim coil plate
(4), shim power group and automatic shimming regulating system are connected to the PID thermostatic control systems, the PID thermostatic control systems
The operating current of the adding thermal resistance (5) is adjusted according to the compensation electric current of the shim coil plate.
2. magnetic resonance analysis permanent magnet device according to claim 1, it is characterised in that：The PID thermostatic controls system
In system the ratio of pid algorithm, integration and differential parameter by the temperature sensor measure the temperature of the magnetic pole plate surface come
Parameter value is determined, using final sets target value as function argument in control process, obtains ratio, integration and differential ginseng
Number.
3. magnetic resonance analysis permanent magnet device according to claim 1, it is characterised in that：Also include magnet case (6), institute
Yoke (1), pole plate (2), guiding iron (3) and shim coil plate (4) is stated to be placed in the magnet case.
4. magnetic resonance analysis permanent magnet device according to claim 1, it is characterised in that：The adding thermal resistance (5) is other
It is additionally provided with small fan (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510493004.2A CN105044634B (en) | 2015-08-12 | 2015-08-12 | Magnetic resonance analysis permanent magnet device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510493004.2A CN105044634B (en) | 2015-08-12 | 2015-08-12 | Magnetic resonance analysis permanent magnet device |
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| CN105044634A CN105044634A (en) | 2015-11-11 |
| CN105044634B true CN105044634B (en) | 2018-01-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102019202001B3 (en) | 2019-02-14 | 2020-06-25 | Bruker Biospin Gmbh | MAS probe head with thermally insulated sample chamber |
| CN112068055B (en) * | 2020-08-27 | 2022-06-17 | 东南大学 | Halbach magnet for noninvasive nuclear magnetic resonance detection of blood sugar of human finger |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168475A (en) * | 1996-06-19 | 1997-12-24 | 通用电器横河医疗系统株式会社 | Magnet assembly for MRI apparatus |
| WO2000016117A1 (en) * | 1998-09-11 | 2000-03-23 | Kruip, Marcel, Jan, Marie | Temperature control for permanent magnet system |
| CN1326552A (en) * | 1998-09-11 | 2001-12-12 | 牛津磁体技术有限公司 | Temperature control system for a permanent magnetic system |
| CN101090021A (en) * | 2006-06-12 | 2007-12-19 | 西门子（中国）有限公司 | Temp. control method for magnetic field element of permanent magnetic resonance system |
| CN101451967A (en) * | 2007-12-04 | 2009-06-10 | 西门子（中国）有限公司 | Method and apparatus for improving imaging quality of nmr imaging equipment |
| CN204903743U (en) * | 2015-08-12 | 2015-12-23 | 上海健康医学院 | Magnetism is permanent magnet device for resonance analysis |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6343649A (en) * | 1986-08-08 | 1988-02-24 | 株式会社日立メディコ | Nuclear magnetic resonance imaging apparatus |
-
2015
- 2015-08-12 CN CN201510493004.2A patent/CN105044634B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168475A (en) * | 1996-06-19 | 1997-12-24 | 通用电器横河医疗系统株式会社 | Magnet assembly for MRI apparatus |
| WO2000016117A1 (en) * | 1998-09-11 | 2000-03-23 | Kruip, Marcel, Jan, Marie | Temperature control for permanent magnet system |
| CN1326552A (en) * | 1998-09-11 | 2001-12-12 | 牛津磁体技术有限公司 | Temperature control system for a permanent magnetic system |
| CN101090021A (en) * | 2006-06-12 | 2007-12-19 | 西门子（中国）有限公司 | Temp. control method for magnetic field element of permanent magnetic resonance system |
| CN101451967A (en) * | 2007-12-04 | 2009-06-10 | 西门子（中国）有限公司 | Method and apparatus for improving imaging quality of nmr imaging equipment |
| CN204903743U (en) * | 2015-08-12 | 2015-12-23 | 上海健康医学院 | Magnetism is permanent magnet device for resonance analysis |
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Address after: 200093 Yingkou Road, Shanghai, No. 101, No. Applicant after: SHANGHAI University OF MEDICINE&HEALTH SCIENCES Applicant after: SUZHOU NIUMAG ANALYTICAL INSTRUMENT Corp. Address before: 200093 Yingkou Road, Shanghai, No. 101, No. Applicant before: SHANGHAI University OF MEDICINE&HEALTH SCIENCES Applicant before: Suzhou Niumag Electronic Technology Co.,Ltd. |
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Effective date of registration: 20240711 Address after: Building 2, Sugaoxin Software Park, No. 78, Keling Road, High tech Zone, Suzhou City, Jiangsu Province, 215163 Patentee after: SUZHOU NIUMAG ANALYTICAL INSTRUMENT Corp. Country or region after: China Address before: 200093 No. 101 Yingkou Road, Yangpu District, Shanghai Patentee before: SHANGHAI University OF MEDICINE&HEALTH SCIENCES Country or region before: China Patentee before: SUZHOU NIUMAG ANALYTICAL INSTRUMENT Corp. |
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Address after: No. 97 Qinglian Road, Hushuguan Town, Suzhou High tech Zone, Suzhou City, Jiangsu Province 215151 Patentee after: SUZHOU NIUMAG ANALYTICAL INSTRUMENT Corp. Country or region after: China Address before: Building 2, Sugaoxin Software Park, No. 78, Keling Road, High tech Zone, Suzhou City, Jiangsu Province, 215163 Patentee before: SUZHOU NIUMAG ANALYTICAL INSTRUMENT Corp. Country or region before: China |
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