CN101345115A - Open type permanent magnet module used for magnetic resonance wave spectrum analyzer - Google Patents
Open type permanent magnet module used for magnetic resonance wave spectrum analyzer Download PDFInfo
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- CN101345115A CN101345115A CNA2008100645190A CN200810064519A CN101345115A CN 101345115 A CN101345115 A CN 101345115A CN A2008100645190 A CNA2008100645190 A CN A2008100645190A CN 200810064519 A CN200810064519 A CN 200810064519A CN 101345115 A CN101345115 A CN 101345115A
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Abstract
The invention provides an open permanent magnet module used for a magnetic resonance spectrum analyser, relating to an open permanent magnet module which solves the problems that the superconducting magnet adopted by existing magnetic resonance spectrum analysis equipment has large volume and weight and high maintenance cost. The upper end surface of an upper magnetic core is arranged on the lower end surface of a C-shaped magnetic yoke upper arm; the magnetization direction of the upper magnetic core is parallel to the vertical direction; the upper end surface of a magnetic pole is arranged on the lower end surface of an upper magnetic core; the lower end surface of the magnetic pole is a convex-concave ring-shaped structure; a shim coil is arranged at the position in an imaging space close to the lower end surface of the magnetic pole; the structure of the lower magnet is the same with that of the upper magnet; furthermore, the lower magnet and the upper magnet are arranged symmetrically in the upper and lower direction on the lower end surface of the C-shaped magnetic yoke; the magnetization direction of the lower magnetic core of the lower magnet is the same to that of the upper magnetic core. The open permanent magnet module of the invention reduces one to two heavyweights correspondingly to the superconducting magnet, the volume of the open permanent magnet module is only 1/4 to 2/3 of that of a normal superconducting magnet module; the uniformity inside the imaging space achieves 10<-6>, and the requirement of industrial magnetic resonance spectrum analysis is met.
Description
Technical field
The present invention relates to a kind of permanent magnet module of style of opening.
Background technology
The most superconducting magnets that adopt of magnet module that are used for MRS at present, because the magnetic field that superconducting magnet provides has the advantage of good uniformity, can satisfy the requirement that the structure of matter is analyzed, volume and weight is big, the higher shortcoming of maintenance cost but superconducting magnet also exists.Magnetic resonance proximate analysis at present owing to the relative superconducting magnet of uniformity of the main field that is provided is relatively poor, can't be satisfied the high performance requirements of MRS with permanent magnet module that spectrometer adopted.
Summary of the invention
The present invention is big for the volume and weight that the superconducting magnet that solves existing MRS equipment employing exists, the maintenance cost problem of higher, and a kind of open type permanent magnet module that is used for magnetic resonance wave spectrum analyzer is provided.The present invention includes C shape yoke, upper magnet and lower magnet, described upper magnet comprises magnetic core, magnetic pole and shim coil, the upper surface of last magnetic core is arranged on the lower surface of C shape yoke upper arm, the direction of magnetization of last magnetic core is parallel to vertical direction, the upper surface of magnetic pole is arranged on the lower surface of magnetic core, the lower surface of magnetic pole is the convex-concave circulus, shim coil is arranged on the position of the lower surface of close magnetic pole in the imaging space, the structure of described lower magnet is identical with upper magnet, and on the laterally zygomorphic lower surface that is arranged on C shape yoke of upper magnet, the direction of magnetization of the following magnetic core of lower magnet is identical with the direction of magnetization of last magnetic core.
Beneficial effect: permanent magnet module of the present invention has that weight is light, the less advantage of volume, its weight has only tens kilogram weights, superconducting magnet can reduce by one to two heavyweight relatively, its volume has only 1/4～2/3 of common superconducting magnet module, owing to, make the uniformity in the imaging space reach 10 with end face, shim coil and the gradient coil Synthetical Optimization of magnetic pole
-6, can satisfy the requirement that industrial magnetic resonance spectrum is analyzed; The lower cost of permanent magnet module of the present invention in addition, have only common superconducting magnet module 1/6 or littler, its maintenance cost of superconducting magnet more can be ignored relatively.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention; Fig. 2 is the structural representation of magnetic pole 2-2.
Embodiment
Embodiment one: referring to Fig. 1, present embodiment is by C shape yoke 1, upper magnet 2 and lower magnet 3 are formed, described upper magnet 2 is by last magnetic core 2-1, magnetic pole 2-2 and shim coil 2-3 form, the upper surface of last magnetic core 2-1 is arranged on the lower surface of C shape yoke 1 upper arm, the direction of magnetization of last magnetic core 2-1 is parallel to vertical direction, the upper surface of magnetic pole 2-2 is arranged on the lower surface of magnetic core 2-1, the lower surface of magnetic pole 2-2 is the convex-concave circulus, shim coil 2-3 is arranged on the position of the lower surface of close magnetic pole 2-2 in the imaging space 4, the structure of described lower magnet 3 is identical with upper magnet 2, and on the laterally zygomorphic lower surface that is arranged on C shape yoke 1 of upper magnet 2, the direction of magnetization of the following magnetic core 3-1 of lower magnet 3 is identical with the direction of magnetization of last magnetic core 2-1.The bulge loop cross section of magnetic pole 2-2 be shaped as rectangle or when trapezoidal, corresponding scrobicular ring be shaped as rectangle or triangle; The shape of upper magnet 2 and lower magnet 3 cross sections can be regular polygon, circle, hollow regular polygon or annular; Last magnetic core 2-1 and following magnetic core 3-1 can adopt the structure of multi-layered magnetic material, and the multi-layered magnetic material can also be divided into many parts along the geometric center of cross section; Shim coil 2-3 can adopt flat shim coil, can fill some non-magnetic materials between shim coil 2-3 and the magnetic pole 2-2.
The magnetic line of force that last magnetic core 2-1 sends forms preliminary magnetic field uniformly in the imaging space 4 of the C shape yoke of being made by high permeability material 1, but the needs of magnetic resonance imaging and analysis of spectrum can not be satisfied in this magnetic field; Again with magnetic pole and shim coil and gradient coil comprehensive Design: at first can realize preliminary shimming to magnetic field by magnetic pole 2-2 being processed into the convex-concave circulus, and further realize meticulous shimming by shim coil 2-3, make the uniformity of the main field of whole imaging space reach 10
-6Thereby, reach the requirement that industrial magnetic resonance spectrum is analyzed.
Embodiment two: referring to Fig. 1, the upper magnet 2 of present embodiment and lower magnet 3 have increased gradient coil 2-4 respectively on the basis of embodiment one, and two gradient coil 2-4 are separately positioned in the imaging space 4 near on the position of magnetic pole end face.The part shimming functions of shim coil can realize by gradient coil 2-4, shim coil 2-3 and gradient coil 2-4 are arranged in the imaging space 4 near on the position of magnetic pole end face, shim coil 2-3 can both play the effect that increases the shimming precision near magnetic pole 2-2 relatively near magnetic pole 2-2 or gradient coil 2-4 relatively, can fill some non-magnetic materials between gradient coil 2-4 and the shim coil 2-3.
Embodiment three: referring to Fig. 2, present embodiment has increased a plurality of magnetic sheets 5 on the basis of embodiment one, and each magnetic sheet 5 all is separately positioned on magnetic pole 2-2 near on the surface of imaging space 4 one ends.Magnetic sheet 5 is used for shimming, also can adopt iron plate partly or entirely to replace magnetic sheet 5.
Claims (7)
1, a kind of open type permanent magnet module that is used for magnetic resonance wave spectrum analyzer, it comprises C shape yoke (1), upper magnet (2) and lower magnet (3), it is characterized in that described upper magnet (2) comprises magnetic core (2-1), magnetic pole (2-2) and shim coil (2-3), the upper surface of last magnetic core (2-1) is arranged on the lower surface of C shape yoke (1) upper arm, the direction of magnetization of last magnetic core (2-1) is parallel to vertical direction, the upper surface of magnetic pole (2-2) is arranged on the lower surface of magnetic core (2-1), the lower surface of magnetic pole (2-2) is the convex-concave circulus, shim coil (2-3) is arranged in the imaging space (4) near on the position of magnetic pole (2-2) lower surface, the structure of described lower magnet (3) is identical with upper magnet (2), and on the laterally zygomorphic lower surface that is arranged on C shape yoke (1) of upper magnet (2), the direction of magnetization of the following magnetic core (3-1) of lower magnet (3) is identical with the direction of magnetization of last magnetic core (2-1).
2, a kind of open type permanent magnet module that is used for magnetic resonance wave spectrum analyzer according to claim 1, it is characterized in that when the bulge loop cross section of described magnetic pole (2-2) be shaped as rectangle the time scrobicular ring be shaped as rectangle, scrobicular ring is shaped as triangle when being shaped as of the bulge loop cross section of described magnetic pole (2-2) is trapezoidal.
3, a kind of open type permanent magnet module that is used for magnetic resonance wave spectrum analyzer according to claim 1, what it is characterized in that upper magnet (2) and lower magnet (3) cross section is shaped as regular polygon, circle, hollow regular polygon or annular.
4, a kind of open type permanent magnet module that is used for magnetic resonance wave spectrum analyzer according to claim 1, it is characterized in that magnetic core (2-1) and following magnetic core (3-1) all adopt the structure of multi-layered magnetic material, the multi-layered magnetic material is divided into many parts along the geometric center of cross section.
5, a kind of open type permanent magnet module that is used for magnetic resonance wave spectrum analyzer according to claim 1, it is characterized in that upper magnet (2) and lower magnet (3) have increased gradient coil (2-4) respectively, two gradient coils (2-4) are separately positioned in the imaging space (4) near on the position of magnetic pole end face.
6, a kind of open type permanent magnet module that is used for magnetic resonance wave spectrum analyzer according to claim 1, it is characterized in that it has increased a plurality of magnetic sheets (5), each magnetic sheet (5) all is separately positioned on magnetic pole (2-2) near on the surface of imaging space (4) one ends.
7, a kind of open type permanent magnet module that is used for magnetic resonance wave spectrum analyzer according to claim 6, the material that it is characterized in that magnetic sheet (5) is an iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100645190A CN101345115A (en) | 2008-05-16 | 2008-05-16 | Open type permanent magnet module used for magnetic resonance wave spectrum analyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100645190A CN101345115A (en) | 2008-05-16 | 2008-05-16 | Open type permanent magnet module used for magnetic resonance wave spectrum analyzer |
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| CN101345115A true CN101345115A (en) | 2009-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100645190A Pending CN101345115A (en) | 2008-05-16 | 2008-05-16 | Open type permanent magnet module used for magnetic resonance wave spectrum analyzer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215921A (en) * | 2013-05-30 | 2014-12-17 | 北京大学 | Fixed-gradient NMR (nuclear magnetic resonance) magnet |
| CN106841264A (en) * | 2016-12-20 | 2017-06-13 | 国网重庆市电力公司电力科学研究院 | A kind of nmr sensor for detecting composite insulator umbrella skirt |
| CN112397271A (en) * | 2020-09-24 | 2021-02-23 | 江苏美时医疗技术有限公司 | High-temperature superconducting magnetic resonance imager |
-
2008
- 2008-05-16 CN CNA2008100645190A patent/CN101345115A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215921A (en) * | 2013-05-30 | 2014-12-17 | 北京大学 | Fixed-gradient NMR (nuclear magnetic resonance) magnet |
| CN106841264A (en) * | 2016-12-20 | 2017-06-13 | 国网重庆市电力公司电力科学研究院 | A kind of nmr sensor for detecting composite insulator umbrella skirt |
| CN106841264B (en) * | 2016-12-20 | 2018-08-28 | 国网重庆市电力公司电力科学研究院 | A kind of nmr sensor for detecting composite insulator umbrella skirt |
| CN112397271A (en) * | 2020-09-24 | 2021-02-23 | 江苏美时医疗技术有限公司 | High-temperature superconducting magnetic resonance imager |
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Open date: 20090114 |