CN203299363U - Passive shimming structure of permanent magnet-type magnetic resonance equipment - Google Patents
Passive shimming structure of permanent magnet-type magnetic resonance equipment Download PDFInfo
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- CN203299363U CN203299363U CN2013203524349U CN201320352434U CN203299363U CN 203299363 U CN203299363 U CN 203299363U CN 2013203524349 U CN2013203524349 U CN 2013203524349U CN 201320352434 U CN201320352434 U CN 201320352434U CN 203299363 U CN203299363 U CN 203299363U
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Abstract
The utility model relates to the medical appliance manufacturing field, specifically to a passive shimming structure of permanent magnet-type magnetic resonance equipment. The outer sides of the peripheries of pole heads of upper and lower poles of the magnetic resonance equipment are provided with a plurality of groups of peripheral shimming structures uniformly and symmetrically, wherein each group of peripheral shimming structures is composed of first shimming structures separated from each other by 7.5+/-0.5 degrees; the outer sides of the peripheries of upper and lower shimming rings of the magnetic resonance equipment are provided with a plurality of groups of peripheral embedded-type shimming structures uniformly and symmetrically, wherein each group of peripheral embedded-type shimming structures is composed of a plurality of second shimming structures which are separated from each other by 5 +/-0.5 degrees; and the positions of the peripheral shimming structures of the pole heads of the upper and lower poles are corresponding to the positions of the peripheral embedded-type shimming structures of the shimming rings of the upper and lower poles. The passive shimming structure of the permanent magnet-type magnetic resonance equipment of the utility model has the advantages of simple structure and easiness in installation, and can adjust magnetic fields according to different angles.
Description
Technical field
The utility model relates to medicine equipment and manufactures field, is a kind of passive shimming structure of Permanent magnetic MR equipment specifically.
Background technology
The diagnosis of the application of magnetic resonance product and various diseases, a kind of general Medical Devices have been become, each large manufacturer spreads all over the world, the Permanent magnetic MR product relatively and superconducting magnet, because its price is superior, in market, occupy significant proportion, each large producer all actively seizes low magnetic resonance market, and in order to show the picture rich in detail of the detected part of human body, MR imaging apparatus requires main magnet can in larger imaging space, produce the magnetic field of high evenness.Due to the error of technologic restriction and assembling, final uniformity of magnetic field can not reach the requirement of imaging.Therefore improve the uniformity coefficient index, the method for improving shimming is a key factor of each company's raising self competitive power.
When producing the Permanent magnetic MR product, the shimming process be in producing must be through process, it is the important step in whole magnetic resonance magnet production procedure, is also technological difficulties.At the existing shimming of shimming technical elements, there are two kinds: active shimming and passive shimming.
Adopt at present the structure of pasting the SmCo magnetic sheet on eddy-current disc to carry out shimming.Because the cost of present SmCo magnetic sheet is very high, in the shimming debug process, need to use a large amount of SmCo magnetic sheets, this becomes the very important factor of a part of production debugging cost structure.Because the SmCo magnetic sheet has temperature coefficient, magnetic property can change along with the change of temperature in addition, and the SmCo magnetic sheet can be in negative field weakening, these factors of instability all can have influence on the uniformity coefficient of magnet.
Magnet transportation and time integral, can make uniformity coefficient change (this situation is extremely general in reality), needs to dismantle gradient coil and on eddy-current disc, paste magnetic sheet, and shimming is installed gradient coil after finishing again.The dismounting of gradient coil also can cause the variation of magnet temperature, needs waiting temperature to stablize and could continue shimming work.This process can affect the efficiency of shimming debugging work greatly, causes the raising of shimming debugging cost.
The utility model content
For above shortcomings part in prior art, problem to be solved in the utility model be to provide a kind of can be in the situation that do not dismantle gradient and carry out a kind of of shimming and be easily understood, it is easy to operate,, not with the passive shimming structure of the Permanent magnetic MR equipment of temperature change.
The utility model adopts following technical scheme:
A kind of passive shimming structure of Permanent magnetic MR equipment, comprise respectively in the cartridge surrounding outside of the upper and lower utmost point of magnetic resonance equipment many group periphery shimming structures be set symmetrically, and every group of periphery shimming structure is comprised of the first shimmings of alternate 7.5 ± 0.5 degree; In the surrounding outside of the upper and lower grading ring of magnetic resonance equipment, be provided with symmetrically the embedded shimming structures of many group peripheries respectively, every group of embedded shimming structure of periphery is comprised of the second shimmings of a plurality of alternate 5 ± 0.5 degree; The cartridge periphery shimming locations of structures correspondence of the described upper and lower utmost point, the embedded shimming locations of structures of the periphery on the grading ring of described upper and lower utmost point correspondence.
Described periphery shimming structure is 4 ~ 8 groups, and the embedded shimming structure of described periphery is 4 ~ 8 groups.
The second shimming of the embedded shimming structure of described periphery is for embedding adjustable ferromagnetic square or the ferromagnetic screw of the degree of depth in grading ring.
Described the first shimming is square ferromagnetic material square, and the second shimming is cylindrical ferromagnetic material screw.
The quantity of periphery shimming structure is even number, and the upper and lower utmost point is symmetrical arranged, and the quantity of the embedded shimming structure of periphery is even number, and the upper and lower utmost point is symmetrical arranged.
Described periphery shimming structure is corresponding with the embedded shimming locations of structures of periphery.
The utlity model has following advantage and beneficial effect:
1. the periphery shimming structure on cartridge can be used as and adjusts uniformity of magnetic field on a large scale and use, and the embedded shimming structure of the periphery on grading ring can be used for the details adjustment in magnetic field, and two kinds of structure generation effects can be complementary and be reached good adjusting magnetic fields.Can add the first shimming or the second shimming according to magnet field intensity and the structure of every kind of model, on cartridge and grading ring, the shimming position can be different, upper and lower utmost point cartridge periphery shimming structural correspondence, the embedded shimming locations of structures of the periphery of upper and lower grading ring correspondence.
2. the utility model is simple in structure, is easy to install, and can adjust magnetic field according to different angles, in the shimming process, need the symmetrical adjustment of upper and lower cartridge, because the shimming square block adopts ferromagnetic material, be not subjected to problems affect, the temperature that has solved the SmCo disk problem of wafing, shorten debug time, from original 4 days, shortened to 2 days, easy to operate, be convenient to training, its screwhole position of the magnet of every kind of model is fixed, and is convenient to make complicated shimming process programming, and data are short and sweet.Adopt the adjustable mode convenient operation of screw depth, make new commissioning staff not need to experience to accumulate experience for a long time could be competent at a job process; A large amount of quantity of using the SmCo magnetic sheet that reduces, save debugging cost, improves the stability of magnets magnetic fields.
3. adjustable extent is flexible, according to the magnetic field difference, can regulate position and the quantity that shimming is adjusted square, according to the size of required regulated quantity, can select shimming adjust square or adjust screw, and quantity is adjustable.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the position relationship schematic diagram of periphery shimming structure of the present utility model and the embedded shimming structure of periphery;
Fig. 3 is cross-sectional view of the present utility model;
Wherein, 1 is the upper utmost point, and 2 is the lower utmost point, and 3 is periphery shimming structure, and 4 is upper grading ring, and 5 is lower grading ring, and 6 is the embedded shimming structure of periphery.
Embodiment
Below in conjunction with accompanying drawing, the utility model structure is described in detail.
Embodiment
As illustrated in fig. 1 and 2, the utility model arranges respectively many group periphery shimming structures 3 symmetrically in the cartridge surrounding outside of the upper and lower utmost point 1,2 of magnetic resonance equipment, and every group of periphery shimming structure 3 is comprised of the first shimmings of alternate 7.5 ± 0.5 degree; In the cartridge upper end of the upper and lower utmost point 1,2 of magnetic resonance equipment, upper and lower grading ring 4,5 is set respectively, the surrounding outside of upper and lower grading ring 4,5 is provided with the embedded shimming structure 6 of periphery symmetrically, as shown in Figure 3, the embedded shimming structure 6 of periphery is comprised of the second shimming structure of a plurality of alternate 5 ± 0.5 degree; The cartridge periphery shimming structure 3 position correspondences of the upper and lower utmost point, embedded shimming locations of structures 6 correspondences of the periphery on the upper and lower grading ring of the upper and lower utmost point.The upper utmost point or the lower cartridge periphery shimming locations of structures that extremely goes up do not need corresponding distribution with the embedded shimming locations of structures of the periphery on grading ring.
In the present embodiment, the second shimming of the embedded shimming structure 6 of periphery is for embedding the adjustable ferromagnetic screw of the degree of depth in grading ring.Periphery shimming structure 3 is 4 groups.The first shimming is the ferromagnetic adjustment block of square.
During installation, ferromagnetic screw is intercalated in respectively to upper and lower grading ring 4,5 surroundings, gos deep into grading ring, by screwing in or screw out the adjustment insert depth; In the cartridge surrounding outside of the upper and lower utmost point, the ferromagnetic adjustment block of square is installed, quantity is adjustable.During installation, can select 0 degree, the position of 0 degree is unfixing, the present embodiment using cartridge towards the position of outermost end as 0 degree (as shown in Figure 2), 0 ± 0.5 degree, 90 ± 0.5 degree, 180 ± 0.5 degree, 270 ± 0.5 symmetrical extensions the in up and down, degree both sides, the ferromagnetic adjustment block of square of periphery shimming structure is installed, 3 of each angles, the angle of being separated by are 7.5 °.The cartridge of usining is spent (as shown in Figure 2) towards the position of outermost end as 0,0 ± 0.5 degree, 90 ± 0.5 degree, 180 ± 0.5 degree, 270 ± 0.5 symmetrical extensions the in up and down, degree both sides, the ferromagnetic screw of the embedded shimming structure of periphery is installed, 5 of each angles, 5 ferromagnetic screw interval angles are 5 °.
The utility model uses the PT2025 teslameter to gather magnetic field data, use shimming software to process the data of collection and calculate the adjustment scheme of the utility model shimming structure, by the position of adjustment periphery shimming structure and the quantity of the ferromagnetic adjustment block of square, and position and the quantity of ferromagnetic screw on grading ring, shimming is adjusted the degree of depth change magnet magnetic circuit distribution that on the ferromagnetic adjustment block of square and grading ring, ferromagnetic screw enters grading ring, is used for compensating the Magnetic field inhomogeneity degree that produces in magnet design, production, assembling process.
Claims (6)
1. the passive shimming structure of a Permanent magnetic MR equipment, it is characterized in that, comprise respectively in the cartridge surrounding outside of the upper and lower utmost point of magnetic resonance equipment many group periphery shimming structures are set symmetrically, every group of periphery shimming structure is comprised of the first shimmings of alternate 7.5 ± 0.5 degree; In the surrounding outside of the upper and lower grading ring of magnetic resonance equipment, be provided with symmetrically the embedded shimming structures of many group peripheries respectively, every group of embedded shimming structure of periphery is comprised of the second shimmings of a plurality of alternate 5 ± 0.5 degree; The cartridge periphery shimming locations of structures correspondence of the described upper and lower utmost point, the embedded shimming locations of structures of the periphery on the grading ring of described upper and lower utmost point correspondence.
2. according to the passive shimming structure of Permanent magnetic MR equipment claimed in claim 1, it is characterized in that, described periphery shimming structure is 4 ~ 8 groups, and the embedded shimming structure of described periphery is 4 ~ 8 groups.
3. according to the passive shimming structure of Permanent magnetic MR equipment claimed in claim 1, it is characterized in that, the second shimming of the embedded shimming structure of described periphery is for embedding adjustable ferromagnetic square or the ferromagnetic screw of the degree of depth in grading ring.
4. according to the passive shimming structure of the described Permanent magnetic MR equipment of claim 1 or 3, it is characterized in that, described the first shimming is square ferromagnetic material square, and the second shimming is cylindrical ferromagnetic material screw.
5. according to the passive shimming structure of Permanent magnetic MR equipment claimed in claim 1, it is characterized in that, the quantity of periphery shimming structure is even number, and the upper and lower utmost point is symmetrical arranged, and the quantity of the embedded shimming structure of periphery is even number, and the upper and lower utmost point is symmetrical arranged.
6. according to the passive shimming structure of Permanent magnetic MR equipment claimed in claim 1, it is characterized in that, described periphery shimming structure is corresponding with the embedded shimming locations of structures of periphery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203524349U CN203299363U (en) | 2013-06-18 | 2013-06-18 | Passive shimming structure of permanent magnet-type magnetic resonance equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203524349U CN203299363U (en) | 2013-06-18 | 2013-06-18 | Passive shimming structure of permanent magnet-type magnetic resonance equipment |
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| Publication Number | Publication Date |
|---|---|
| CN203299363U true CN203299363U (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203524349U Expired - Lifetime CN203299363U (en) | 2013-06-18 | 2013-06-18 | Passive shimming structure of permanent magnet-type magnetic resonance equipment |
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| Country | Link |
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| CN (1) | CN203299363U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105652225A (en) * | 2015-12-28 | 2016-06-08 | 沈阳东软医疗系统有限公司 | Field uniforming method and field uniforming device of magnetic resonance system |
-
2013
- 2013-06-18 CN CN2013203524349U patent/CN203299363U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105652225A (en) * | 2015-12-28 | 2016-06-08 | 沈阳东软医疗系统有限公司 | Field uniforming method and field uniforming device of magnetic resonance system |
| CN105652225B (en) * | 2015-12-28 | 2019-01-25 | 沈阳东软医疗系统有限公司 | A kind of method for shimming and device of magnetic resonance system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131120 |
|
| CU01 | Correction of utility model | ||
| CU01 | Correction of utility model |
Correction item: Termination upon expiration of patent Correct: Revocation of Patent Expiration and Termination False: On July 4, 2023, the expiration and termination of the 39 volume 2701 patent Number: 27-01 Volume: 39 |