CN201508739U - Permanent magnet for magnetic resonance imaging system - Google Patents
Permanent magnet for magnetic resonance imaging system Download PDFInfo
- Publication number
- CN201508739U CN201508739U CN2009201970442U CN200920197044U CN201508739U CN 201508739 U CN201508739 U CN 201508739U CN 2009201970442 U CN2009201970442 U CN 2009201970442U CN 200920197044 U CN200920197044 U CN 200920197044U CN 201508739 U CN201508739 U CN 201508739U
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- magnet
- magnetic material
- magnetic
- permanent
- resonance imaging
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Abstract
The utility model relates to a permanent magnet for a magnetic resonance imaging system which comprises a hollow yoke (1), the inner surface of the hollow yoke (1) is provided with main magnets made of permanent magnet material symmetrically, the relative surface of the main magnet is provided with polar planes (3), an imaging space is formed between two polar planes (3). The permanent magnet for the magnetic resonance imaging system is characterized in that: the main magnet comprises at least two magnets, the first side face of the first magnetic (2-1) connects with the inner surface of the hollow yoke (1), the first side face of the second magnet (2-2) connects with the second side face of the first magnet (2-1) through a soft-magnetic material (2-3), the transverse width of the second magnet is smaller than the first magnet (2-1), accordingly, the main magnet composed by the first magnet (2-1) and the second magnet (2-2) has an echelon edge, the polar plane (3) connects with the second side face of the second magnet (2-2). Compared with the prior art, the utility model has advantages that: the echelon structure of the permanent magnet can reduce magnetic leakage coefficient efficiently, has simple structure and is convenient for manufacturing.
Description
Technical field
The utility model relates to a kind of permanent-magnet that is used for magnetic resonance imaging system.
Background technology
Magnetic resonance imaging can provide high spatial resolution, unlimited penetration depth and very good soft tissue contrast, and dissection location, splendid space, so magnetic resonance imaging has the incomparable advantage of other iconography technology.And permanent-magnet is the core component in the magnetic resonance imaging system, and the image quality of magnetic resonance imaging system is played a decisive role.
The existing permanent-magnet that is used for magnetic resonance imaging system, generally comprise open or enclosed hollow yoke, the inside of hollow yoke is symmetrical arranged the main magnet of being made by the permanent magnetism material, for focusing magnetic field, overcome permanent magnetic material performance difference, set up uniform magnetic field, magnetic homogenizing pole plate generally is set on main magnet opposed outer surface, then be formed into the image space between the two magnetic homogenizing pole plates.The magnetic field intensity of permanent-magnet is high more, and the picture quality signal to noise ratio that magnetic resonance imaging system obtains is good more, picture quality is high more, still, obtain high-intensity magnetic field intensity, just must use more permanent magnetic material, promptly must strengthen the thickness of main magnet.But the thickness of main magnet is high more, and the permanent magnetic material that need use is many more, and cost is also just high more.
In order to improve the field intensity in magnetic field, except the permanent magnetic material consumption of the simple main magnet of increase, can also improve the magnetic field intensity between two main magnets by the magnetic leakage factor that reduces main magnet, the i.e. magnetosheath of sheathed different direction of magnetizations outside main magnet, or add a circle magnet with main magnet direction of magnetization quadrature in the outer ring of magnetic homogenizing pole plate, in order to contain the magnetic flux of the outside disperse of main magnet, so that the magnetic flux overwhelming majority is passed through the imaging space between magnetic homogenizing pole plate, thereby reach the purpose that magnetic field intensity is improved.But reduce the method for the magnetic leakage factor of main magnet, though can decrease on the use amount to the magnetic material, the processing cost of the assembling of magnet and the magnet of the different direction of magnetizations also can correspondingly increase.
The utility model content
Technical problem to be solved in the utility model be at above-mentioned prior art provide a kind of under the situation that the magnet field intensity increases the consumption of magnetic material increase the permanent-magnet that is used for magnetic resonance imaging system few, simple in structure.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: this is used for the permanent-magnet of magnetic resonance imaging system, comprise the hollow yoke, hollow yoke inner surface is symmetrical arranged the main magnet of being made by permanent magnetic material, main magnet apparent surface is provided with pole-face, be formed into the image space between two pole-faces, it is characterized in that: described main magnet comprises two blocks of magnetic materials at least, wherein first side of the first magnetic material links to each other with hollow yoke inner surface, first side of the second magnetic material is connected by second side of soft magnetic material with the first magnetic material, the transverse width of the second magnetic material is littler than the first magnetic material, thereby make the main magnet of win magnetic material and second magnetic material composition have stepped edges, pole-face is connected with second side of the second magnetic material.
Described pole-face comprises pole plate, and the outer surface of pole plate is provided with the magnet ring that is used for uniform magnetic field, on the outer surface of pole plate, magnet ring inside also is provided for the magnetic sheet of eddy current always.
The shape of the described first magnetic material can be solid cylindrical or hollow cylindrical or solid regular prism shape or hollow regular prism shape.
The shape of the described second magnetic material also can be solid cylindrical or hollow cylindrical or solid regular prism shape or hollow regular prism shape.
Compared with prior art, advantage of the present utility model is: by main magnet is made step structure, can effectively reduce magnetic leakage factor, and simple in structure, be convenient to processing and manufacturing.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the structural representation of pole-face in the embodiment of the invention;
Fig. 3 is the shape schematic diagram one of the first magnetic material and the second magnetic material;
Fig. 4 is the shape schematic diagram two of the first magnetic material and the second magnetic material;
Fig. 5 is the shape schematic diagram three of the first magnetic material and the second magnetic material;
Fig. 6 is the shape schematic diagram four of the first magnetic material and the second magnetic material.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
The permanent-magnet that is used for magnetic resonance imaging system as shown in Figure 1, comprise C type hollow yoke 1, main magnet and pole-face 3, C type hollow yoke 1 inner surface is symmetrical arranged the main magnet of being made by permanent magnetic material up and down, wherein main magnet is made up of the first magnetic material 2-1 and the second magnetic material 2-2, first side of the first magnetic material 2-1 links to each other with C type hollow yoke 1 inner surface, first side of the second magnetic material 2-2 is connected with second side of the first magnetic material 2-1 by steel plate 2-3, the transverse width of the second magnetic material 2-2 is littler than the first magnetic material 2-1, thereby make the main magnet of win magnetic material 2-1 and second magnetic material 2-2 composition have stepped edges, pole-face 3 is connected with second side of the second magnetic material 2-2.
Pole-face 3 comprises pole plate 3-1, and the outer surface of pole plate 3-1 is provided with the magnet ring 3-2 that is used for uniform magnetic field, plate (on the outer surface of 3-1, magnet ring 3-2 inside also is provided for the magnetic sheet 3-3 of eddy current always, referring to shown in Figure 2.
The shape of the first magnetic material 2-1 and the second magnetic material can be a solid cylindrical, referring to shown in Figure 3, also can be hollow cylindrical, referring to shown in Figure 4, also can be solid regular prism shape, referring to shown in Figure 5, also can be hollow regular prism shape, referring to shown in Figure 6.
Claims (4)
1. the permanent-magnet that is used for magnetic resonance imaging system, comprise hollow yoke (1), hollow yoke (1) inner surface is symmetrical arranged the main magnet of being made by permanent magnetic material, main magnet apparent surface is provided with pole-face (3), two pole-faces are formed into the image space between (3), it is characterized in that: described main magnet comprises two blocks of magnetic materials at least, wherein first side of the first magnetic material (2-1) links to each other with hollow yoke (1) inner surface, first side of the second magnetic material (2-2) is connected with second side of the first magnetic material (2-1) by soft magnetic material (2-3), the transverse width of the second magnetic material (2-2) is littler than the first magnetic material (2-1), thereby make the main magnet of win magnetic material (2-1) and the second magnetic material (2-2) composition have stepped edges, pole-face (3) is connected with second side of the second magnetic material (2-2).
2. the permanent-magnet that is used for magnetic resonance imaging system according to claim 1, it is characterized in that: described pole-face (3) comprises pole plate (3-1), the outer surface of pole plate (3-1) is provided with the magnet ring (3-2) that is used for uniform magnetic field, on the outer surface of pole plate (3-1), the inner magnetic sheet of eddy current (3-3) always that also is provided for of magnet ring (3-2).
3. the permanent-magnet that is used for magnetic resonance imaging system according to claim 1 and 2 is characterized in that: the described first magnetic material (2-1) be shaped as solid cylindrical or hollow cylindrical or solid regular prism shape or hollow regular prism shape.
4. the permanent-magnet that is used for magnetic resonance imaging system according to claim 1 and 2 is characterized in that: the described second magnetic material (2-2) be shaped as solid cylindrical or hollow cylindrical or solid regular prism shape or hollow regular prism shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201970442U CN201508739U (en) | 2009-09-15 | 2009-09-15 | Permanent magnet for magnetic resonance imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201970442U CN201508739U (en) | 2009-09-15 | 2009-09-15 | Permanent magnet for magnetic resonance imaging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201508739U true CN201508739U (en) | 2010-06-16 |
Family
ID=42469865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201970442U Expired - Lifetime CN201508739U (en) | 2009-09-15 | 2009-09-15 | Permanent magnet for magnetic resonance imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201508739U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103860178A (en) * | 2014-03-21 | 2014-06-18 | 沈阳中北真空磁电科技有限公司 | Permanent magnet used for nuclear magnetic resonance imager |
| CN103901372A (en) * | 2013-11-29 | 2014-07-02 | 沈阳东软波谱磁共振技术有限公司 | Permanent magnet and rack thereof |
| CN103959082A (en) * | 2011-05-10 | 2014-07-30 | 美时医疗控股有限公司 | Cryogenically cooled whole-body rf coil array and mri system having same |
| CN109870665A (en) * | 2019-01-31 | 2019-06-11 | 佛山瑞加图医疗科技有限公司 | Permanent magnetic field generating device, assemble method and MR imaging apparatus |
-
2009
- 2009-09-15 CN CN2009201970442U patent/CN201508739U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103959082A (en) * | 2011-05-10 | 2014-07-30 | 美时医疗控股有限公司 | Cryogenically cooled whole-body rf coil array and mri system having same |
| CN103901372A (en) * | 2013-11-29 | 2014-07-02 | 沈阳东软波谱磁共振技术有限公司 | Permanent magnet and rack thereof |
| CN103860178A (en) * | 2014-03-21 | 2014-06-18 | 沈阳中北真空磁电科技有限公司 | Permanent magnet used for nuclear magnetic resonance imager |
| CN103860178B (en) * | 2014-03-21 | 2016-04-06 | 沈阳中北真空磁电科技有限公司 | A kind of permanent magnet for nuclear magnetic resonance imaging instrument |
| CN109870665A (en) * | 2019-01-31 | 2019-06-11 | 佛山瑞加图医疗科技有限公司 | Permanent magnetic field generating device, assemble method and MR imaging apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: XINGAOYI MEDICAL EQUIPMENT CO., LTD. Free format text: FORMER NAME: NINGBO XINGAOYI MAGNETIC MATERIAL CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 315400 No. 555 smelting Road, Yuyao City, Zhejiang Province Patentee after: XINGAOYI MEDICAL EQUIPMENT CO., LTD. Address before: 315400 No. 777 Tan Xi Road, Yuyao, Zhejiang Patentee before: Ningbo Xingaoyi Magnetism Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100616 |
|
| CX01 | Expiry of patent term |