CN206532660U - A kind of Halbach magnets detected available for brain - Google Patents
A kind of Halbach magnets detected available for brain Download PDFInfo
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- CN206532660U CN206532660U CN201720285424.6U CN201720285424U CN206532660U CN 206532660 U CN206532660 U CN 206532660U CN 201720285424 U CN201720285424 U CN 201720285424U CN 206532660 U CN206532660 U CN 206532660U
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- permanent magnet
- magnet blocks
- brain
- elliptic curve
- blocks
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Abstract
The utility model discloses a kind of Halbach magnets detected available for brain, including the main magnet being made up of 9 permanent magnet blocks, the cavity area ROI formation static magnetic field homogeneous areas of main magnet, the central point of 9 permanent magnet blocks along elliptic curve in etc. arc length distribution, the direction of magnetization per adjacent 2 pieces of permanent magnet blocks is deflected and is symmetrically distributed on elliptic curve successively along elliptic curve, the angle between the direction of magnetization per adjacent 2 pieces of permanent magnet blocks is 45 degree, the cross section both sides of 9 permanent magnet blocks are vertically arranged with installing plate respectively, it is engaged on 2 installing plates along profile with the horizontal distribution direction of 9 permanent magnet blocks, it is connected between the corner of 2 installing plates by screw rod, each screw rod is provided at both ends with nut.The utility model is the open magnet of semi-ring, and human body brain need not be put into inside magnet structure, realizes the open nuclear magnetic resonance measurement of brain, and magnet volume is small is easy to movement, realizes the real non-destructive magnetic resonance detection of human body brain.
Description
Technical field
The utility model belongs to brain diseases detection technique field, is related to a kind of Halbach magnetic detected available for brain
Body.
Background technology
Emerging electromagnetic imaging technology, such as EIT, MIT, although equipment volume is smaller, be easy to carry and structure opening, can
Conveniently to carry out real-time monitoring to intracranial disease, but technology is immature, and imaging resolution is low；And it is traditional, more into
Although the resolution ratio that ripe nuclear magnetic resonance technique is imaged for tissue is higher, the real-time prison of brain diseases is difficult to use in
Shield.
Nuclear magnetic resonance technique is widely used in life medical treatment, food analysis, quality control as a kind of nondestructiving detecting means
System, materials science field and geophysics field etc..The main magnet for producing static magnetic field is the core component of nuclear magnetic resonance apparatus,
Current main magnet can be divided into three types：1) electromagnet.Field homogeneity sexual satisfaction is imaged basic demand, but the magnetic field ability produced
It is limited and power consumption water consumption is big；2) superconducting magnet.Although this kind of magnet can produce very strong magnetic field, refrigeration must be used
It is costly needed for agent, the low temperature environment of maintenance superconduction；3) permanent magnet.Although the magnetic field that permanent magnet is produced can not reach in intensity
To the magnitude of superconducting magnet, but the lower uniformity of magnetic field of strict processing can reach requirement, and using this magnet without expensive and multiple
Miscellaneous optional equipment, Operation and Maintenance is fairly simple, conveniently, and the permanent magnetism rare earth material rich reserves of China, using permanent magnet
Material is and reliable and stable come expense relative moderate needed for building.Here it is the structure of the application is built using permanent magnet material
The reason for Halbach magnet main fields.
1979, Lawrence Berkeley National laboratory doctor K.Halbach proposed a kind of magnet structure, the magnetic
Volume array is made up of rare earth permanent-magnetic material, and the magnetic body module of magnetizing direction consecutive variations is arranged in into cylindrical shape according to certain rules
Structure, can obtain uniform magnetic field on the inside of cylinder-shaped magnet structure, and almost without Distribution of Magnetic Field on the outside of it.Academia will
The permanent magnet of this array way is referred to as Halbach array magnet.As permanent magnetic device is constantly to miniaturization and the hair of portability
Exhibition trend, the outstanding characteristic of Halbach array has obtained the extensive concern of academia and industrial quarters.
Patent 200510011970.2 improves the end effect of Halbach magnets, proposes in the lower end of Halbach magnets
It is stained with the axial magnetic field in the magnet structure of a semi-annular shape, compensation cylinder Halbach magnet bores.
Patent 200510086407.1 implements further improvement to the structure of patent 200510011970.2, with hemispherical
Magnet structure replaces the magnet structure of semi-annular shape, reduces leakage field, further increases the use effect of permanent magnet module
Rate.
Patent 201010237804.5 is improved Halbach structure, proposes to use isosceles triangle permanent magnet mould
Block, facilitates the installation of magnet structure, improves the service efficiency of permanent magnet module.
However, Halbach array, magnet structure closing, testee must be placed at cylinder-shaped magnet structure intracavitary, this
Plant structure not applying to for the patient with claustrophobia, simultaneously for patient for being provided with pacemaker or installation artificial limb etc.
Forbid to carry out NMR inspections.Place the patient of intrauterine contraceptive device in utero such as has inadaptable stopping at once checking in inspection, so for this
A little brain injury patients can not be applicable.
And NMR is complicated at present, volume is larger, and inconvenience is mobile, while once diagnosing somewhat expensive, it is difficult to
Clinical real-time monitoring is realized, it is now positive to promote primary care reform with reference to the current national conditions of China, set in different medical unit
Put small volume, cheap harmless real-time watch device, the demand to large medical equipment can be reduced.
So, now in the urgent need to a kind of small volume, it is cheap, be easy to movement the bed doctor that side is detected can be provided for sufferer
Equipment is treated, disease development situation can be provided to doctor in time.But it disclosure satisfy that there is presently no a kind of suitable magnet structure
This demand.
Utility model content
In order to achieve the above object, the utility model provides a kind of Halbach magnets detected available for brain, solves
Existing NMR is complicated, volume is larger, it is inconvenient mobile the problem of.
The utility model is the technical scheme adopted is that a kind of Halbach magnets detected available for brain, including by 9
The main magnet that individual permanent magnet blocks are constituted, the cavity area ROI formation static magnetic field homogeneous areas of the main magnet, described in 9 forever
The central point of magnet block along elliptic curve in etc. arc length distribution, per adjacent 2 pieces of permanent magnet blocks the direction of magnetization along elliptic curve according to
Secondary to deflect and be symmetrically distributed on elliptic curve, the angle between the direction of magnetization per adjacent 2 pieces of permanent magnet blocks is 45 degree, 9
The cross section both sides of the permanent magnet blocks are vertically arranged with installing plate respectively, along profile and 9 permanent magnetism on 2 installing plates
The horizontal distribution direction of body block is engaged, and is connected between the corner of 2 installing plates by screw rod, each screw rod
It is provided at both ends with nut.
It is of the present utility model to be further characterized in that,
Further, 9 permanent magnet blocks are the strip rectangle that cross section is square, 9 permanent magnet blocks
Remanent magnetism is identical, and 9 permanent magnet blocks direction of magnetizations are set and parallel with respective short side along respective cross section.
Further, the direction of magnetization per 2 pieces of adjacent permanent magnet blocks is symmetrical along elliptic curve.
Further, 2 installing plates include the inner panel and outside plate being bonded, described in each inner panel and 9
The position corresponding position of permanent magnet blocks cross section is provided with the through hole that 9 sizes coordinate.
The utility model has the advantage of：Static magnetic field homogeneous area produced by the Halbach magnet structures is located at
The inside of Halbach magnet structures, and the Halbach magnets are the open magnet of semi-ring, so human body brain need not be put
Enter and measured inside magnet structure, realize the open nuclear magnetic resonance measurement of brain.And magnet volume is small, it is easy to move
It is dynamic, it is achieved thereby that real non-destructive magnetic resonance detection by the bed of human body brain, overcomes existing nuclear magnetic resonance magnet structure body
Product is huge, expensive, closing, the shortcomings of testing cost is high, the Halbach magnet structures small volume, it is lightweight, be easy to brain
Detection in real time by the bed of Disease.The height adjustable of the sheet homogeneous static magnetic field region distance main magnet body structure surface, should
The regulation of height can be realized in the following manner：Adjust the semiellipse where 9 rectangular permanent magnet block central points in main magnet
The shape of curve, the shape of semiellipse curve is set to be realized by changing elliptic curve major axis a and short axle b size.
Further advantage of the present utility model, target and feature will be explained in the following description to a certain extent
State, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or
Person can be instructed from practice of the present utility model.Target and further advantage of the present utility model can be said by following
Specifically noted structure is realized and obtained in bright book, claims and accompanying drawing.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of the Halbach magnets detected available for brain of the utility model；
Fig. 2 is a kind of magnet structure schematic diagram of the Halbach magnets detected available for brain of the utility model；
Fig. 3 is a kind of magnet structure cross-sectional view of the Halbach magnets detected available for brain of the utility model；
Fig. 4 is a kind of single mounting plates structure schematic diagram of the Halbach magnets detected available for brain of the utility model；
Fig. 5 is a kind of static magnetic field homogeneous area (ROI of the Halbach magnets detected available for brain of the utility model
Region) calculated value and measured value schematic diagram in magnetic field in the range of xoz planes 10mm × 50mm；
Fig. 6 is a kind of static magnetic field homogeneous area (ROI of the Halbach magnets detected available for brain of the utility model
Region) depth direction magnetic field calculated value and measured value schematic diagram.
In figure, 1. installing plates, 2. screw rods, 3. permanent magnet blocks, 4. through holes.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
A kind of Halbach magnets detected available for brain of the utility model, as shown in figures 1 to 6, including by 9 permanent magnets
The main magnet that block 3 is constituted, the cavity area ROI formation static magnetic field homogeneous areas of the main magnet, 9 permanent magnet blocks 3
Central point along elliptic curve in etc. arc length distribution, deflected successively along elliptic curve per the direction of magnetizations of adjacent 2 pieces of permanent magnet blocks 3
And be symmetrically distributed on elliptic curve, the angle between the direction of magnetization per adjacent 2 pieces of permanent magnet blocks 3 is 45 degree, described in 9 forever
The cross section both sides of magnet block 3 be vertically arranged with respectively 1,2 installing plates 1 of installing plate on along profile and 9 permanent magnets
The horizontal distribution direction of block 3 is engaged, and is connected between the corner of 2 installing plates 1 by screw rod 2, each screw rod 2
Be provided at both ends with nut.
9 permanent magnet blocks 3 are the strip rectangle that cross section is square, the remanent magnetism phase of 9 permanent magnet blocks 3
Together, 9 direction of magnetizations of permanent magnet blocks 3 are set and parallel with respective short side along respective cross section.It is described every adjacent
2 pieces of permanent magnet blocks 3 the direction of magnetization it is symmetrical along elliptic curve.2 installing plates 1 include the inner panel being bonded and
The position corresponding position of outside plate, each inner panel and 9 cross sections of permanent magnet blocks 3 is provided with running through for 9 sizes cooperations
Hole 4.
A kind of Halbach magnet knots detected for brain that the utility model embodiment is provided are described below in detail
Structure:
The utility model embodiment is made up of 9 rectangular permanent magnet blocks 3.As Figure 2-3, cross section
For the permanent magnet blocks 3 of positive direction, symbol A is used respectively from left to right1、A2、A3、A4、A5、A6、A7、A8And A9To represent, 9 permanent magnetism
Body block 3 constitutes main magnet B.Black arrow symbol on each rectangular permanent magnet block 3 represents the direction of magnetization of the magnet block.Three
Tie up in rectangular coordinate system xyz, A1The direction of magnetization of number permanent magnet blocks 3 is parallel with z-axis, and points to negative z-axis opposite direction.
The direction of magnetization of other 8 pieces of rectangular permanent magnet blocks 3 and the angle of negative z-axis are respectively 45 ° of (n-1), wherein n be this 8
Individual rectangular permanent magnet block 3 is numbered, and is close to A1The right side of number rectangular permanent magnet block 3 is A2Number, the folder of its direction of magnetization and negative z-axis
Angle is 45 °, is close to A2The right side of rectangular permanent magnet block 3 is A3Number, the angle of its direction of magnetization and negative z-axis is 90 °, with such
Push away.
In Fig. 2, the rectangular spatial areas above main magnet is the Halbach magnets that the utility model embodiment is provided
Static magnetic field homogeneous area produced by structure.
Fig. 3 is the cross-sectional view of main magnet structure, with reference to the figure, and the utility model is adjusted in main magnet into 9 rectangles forever
The principle of semiellipse curve shape where the central point of magnet block 3 is described in detail as follows：9 central points of rectangular permanent magnet block 3 etc.
On the latter half curve of the elliptic curve being distributed in yoz planes of arc length.A1Number permanent magnet blocks 3 and A9In number permanent magnet blocks 3
The line of heart point is the straight line where y-axis, and the midpoint of the two central point lines is the origin o points of coordinate system.The elliptic curve
Equation be：
Wherein a is the length of the elliptic curve major axis, i.e. origin o points are to A9The air line distance of number central point of permanent magnet blocks 3.
A is the length of the elliptic curve short axle, i.e. origin o points are to A5The air line distance of number central point of permanent magnet blocks 3.By adjusting a and b
Size, change elliptic curve shape, realize the regulation of static magnetic field homogeneous area height so that static magnetic field homogeneous area
Positioned at A1Number and B permanent magnet blocks upper surface where plane.Arrow in Fig. 3 represents magnet as the arrow in Fig. 1
The direction of magnetization.
Fig. 4 is the embodiment for fixing the installing plate 1 of main magnet structure.The structure of installing plate 1 is by two panels aluminium
Expect that thin plate is constituted, respectively inner panel and outside plate.Inner panel is identical with outside plate thickness shape, is all half arc as shown in the figure.On inner panel
The arrangement mode of 4, the 9 square through holes of square through hole of as shown in Figure 49 is cut out with constituting 9 of main magnet
The arrangement mode of rectangular permanent magnet block 3 is consistent, can so fix the relative position of permanent magnet blocks.The corresponding position of outside plate does not have
There is perforation, inner panel and outside plate are glued together with strength, form the structure of integral installation plate 1.
Fig. 1 is structural representation of the present utility model, by the screw rod 2 and 9 rectangle permanent magnetism of 2 installing plate Isosorbide-5-Nitrae metals
Body block 3 is constituted, and 2 installing plates 1 are located at main magnet structure B two ends respectively, and 4 screw rods 4 connect 2 installing plates 1, make main magnet
Structure B is by being clipped between 2 installing plates 1 tightly.
Fig. 5 is the static magnetic field homogeneous area longitudinal cross-section Distribution of Magnetic Field figure produced by the utility model specific embodiment,
The size of rectangular permanent magnet block 3 is 30mm × 30mm × 100mm in the embodiment, and the length of side of square cross section is 30mm, phase
It is 1.05 to magnetic conductivity, remanent magnetism is the major axis a=of the elliptic equation where each module midpoint of permanent magnet blocks 3 in 1.38T, main magnet
195.2mm, short axle b=122.6mm.
Fig. 6 is the static magnetic field homogeneous area lateral cross section Distribution of Magnetic Field figure produced by the utility model specific embodiment.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
Preferred embodiment of the present utility model is the foregoing is only, protection model of the present utility model is not intended to limit
Enclose.All any modification, equivalent substitution and improvements made within spirit of the present utility model and principle etc., are all contained in this reality
With in new protection domain.
Claims (4)
1. a kind of Halbach magnets detected available for brain, it is characterised in that including the master being made up of 9 permanent magnet blocks (3)
Magnet, the cavity area ROI formation static magnetic field homogeneous areas of the main magnet, the central point edge of 9 permanent magnet blocks (3)
Elliptic curve in etc. arc length distribution, deflect and symmetrically divide successively along elliptic curve per the direction of magnetizations of adjacent 2 pieces of permanent magnet blocks (3)
Cloth is on elliptic curve, and the angle between the direction of magnetization per adjacent 2 pieces of permanent magnet blocks (3) is 45 degree, 9 permanent magnet blocks
(3) cross section both sides are vertically arranged with installing plate (1) respectively, along profile and 9 permanent magnets on 2 installing plates (1)
The horizontal distribution direction of block (3) is engaged, and is connected between the corner of 2 installing plates (1) by screw rod (2), Mei Gesuo
That states screw rod (2) is provided at both ends with nut.
2. a kind of Halbach magnets detected available for brain according to claim 1, it is characterised in that described 9 are forever
Magnet block (3) is the strip rectangle that cross section is square, and 9 permanent magnet blocks (3) remanent magnetism is identical, 9 permanent magnetism
Body block (3) direction of magnetization is set and parallel with respective short side along respective cross section.
3. a kind of Halbach magnets detected available for brain according to claim 1, it is characterised in that described per phase
The direction of magnetization of 2 pieces of adjacent permanent magnet blocks (3) is symmetrical along elliptic curve.
4. a kind of Halbach magnets detected available for brain according to claim 1, it is characterised in that 2 peaces
Dress plate (1) includes the position of the inner panel and outside plate being bonded, each inner panel and 9 permanent magnet blocks (3) cross sections
Corresponding position is provided with the through hole (4) that 9 sizes coordinate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720285424.6U CN206532660U (en) | 2017-03-23 | 2017-03-23 | A kind of Halbach magnets detected available for brain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720285424.6U CN206532660U (en) | 2017-03-23 | 2017-03-23 | A kind of Halbach magnets detected available for brain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206532660U true CN206532660U (en) | 2017-09-29 |
Family
ID=59917885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720285424.6U Expired - Fee Related CN206532660U (en) | 2017-03-23 | 2017-03-23 | A kind of Halbach magnets detected available for brain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206532660U (en) |
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2017
- 2017-03-23 CN CN201720285424.6U patent/CN206532660U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170929 Termination date: 20180323 |
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| CF01 | Termination of patent right due to non-payment of annual fee |