CN201548675U - Field adjusting equipment of nuclear magnetic resonance imaging device - Google Patents
Field adjusting equipment of nuclear magnetic resonance imaging device Download PDFInfo
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- CN201548675U CN201548675U CN2009201425569U CN200920142556U CN201548675U CN 201548675 U CN201548675 U CN 201548675U CN 2009201425569 U CN2009201425569 U CN 2009201425569U CN 200920142556 U CN200920142556 U CN 200920142556U CN 201548675 U CN201548675 U CN 201548675U
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- shimming
- superconducting magnet
- fixed head
- resonance imaging
- magnetic field
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Abstract
The utility model discloses field adjusting equipment of a nuclear magnetic resonance imaging device. The equipment comprises a plurality of shimming blocks (1) made of ferromagnetic materials, wherein the shimming blocks are arranged on the inner wall side of a superconducting magnet (2) of a nuclear magnetic resonance imaging device and fixed with the inner wall of the superconducting magnet or the outer wall of a gradient coil (3) in the superconducting magnet. The field distribution in a surveyed area can be finely adjusted through the affection to the surrounding space field of ferromagnetic materials, so that the field in the surveyed area of the magnetic can meet the requirement of higher uniformity.
Description
Technical field
The invention belongs to the nuclear magnetic resonance technique field, be specifically related to a kind of magnetic field control method and device thereof of Magnetic resonance imaging equipment, the magnetic field homogeneity that can be applicable to aperture formula superconducting magnet is regulated.
Background technology
Nuclear magnetic resonance full name is that (Magnetic Resonance Imaging MRI), is the non-vanishing atomic nucleus of magnetic moment to Magnetic resonance imaging, outside magnetic field effect spin energy level generation Zeeman splitting down, the physical process of the radio-frequency radiation of the certain frequency of resonance absorption.Nuclear magnetic resonance is a kind of physical phenomenon, is applied to fields such as physics, chemistry, biology as a kind of analysis means, just it is used for clinical medicine by 1973 and detects.Usually said nuclear magnetic resonance is meant the technology of utilizing nmr phenomena to obtain molecular structure, inside of human body structural information.At present, nuclear magnetic resonance is widely used in molecular composition and structure analysis, biological tissue and biological tissue analysis, aspects such as pathological analysis, medical diagnosis, product non-destructive monitoring.
In order to realize above-mentioned measuring ability, requiring the magnet in the nuclear magnetic resonance equipment usually is that a basic static magnetic field that uniformity coefficient is very high is provided in the surveyed area at certain particular space.Although this uniformity coefficient requires and can realize in the design of magnet, yet because engineering construction and technological factor are difficult in the uniformity coefficient that reaches design after the magnet manufacturing is finished.Therefore, needing the mechanism that uniformity of magnetic field is regulated remedies design, makes after finishing magnet in the unevenness in magnetic field that surveyed area provides.The present invention comes therefrom.
Summary of the invention
The object of the invention is to provide a kind of magnetic field regulating device of Magnetic resonance imaging equipment, has solved the interior surveyed area of prior art center MR imaging apparatus superconducting magnet and has been difficult to obtain higher problems such as magnetic field homogeneity by direct processing and assembling.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of magnetic field regulating device of Magnetic resonance imaging equipment, it is characterized in that described magnetic field regulating device comprises a plurality of shimming pieces that mainly are made of ferromagnetic material, described shimming piece is arranged on the superconducting magnet inwall side of Magnetic resonance imaging equipment and fixes with the superconducting magnet inwall or fix with the gradient coil outer wall in the superconducting magnet.
Preferably, described superconducting magnet inwall or gradient coil outer wall equal angles axially are provided with several pickup grooves, and described pickup groove fixedly installs the shimming material fixed head with several through holes, and described shimming piece is fixed by through hole and shimming material fixed head.
Preferably, described shimming piece is that the cross section is circle or rectangle or erose ferromagnetic thin slice, and the middle part setting of described shimming piece cooperates fixing through hole with through hole on the shimming material fixed head.
Preferably, described pickup groove is a concave slot, and described shimming material fixed head is fixed in the pickup groove by the two ends through hole; Fix several shimming pieces by the shimming piece web member on the through hole on the described shimming material fixed head.
Preferably, described pickup groove and superconducting magnet inwall or gradient coil outer wall are wholely set, and described pickup groove distributes axisymmetricly with respect to the central shaft of superconducting magnet.
Preferably, described pickup groove distributes along the circumferential equal angles of superconducting magnet, and its quantity is in 12～36 scopes; Described shimming piece web member is selected from screw, draw-in groove; The fixing position consistency of shimming piece on the described fixed head, and be symmetrically distributed about the plane of symmetry of the non-shaft section of superconducting magnet; On described each fixed head fixedly the quantity of the position of shimming piece can be 10～30.
Shimming material fixed head described in the technical solution of the present invention can be made of one group of long slab with square-section, this group fixed head by web member with pickup groove, fixed head and magnet or gradient coil relative fixed; Described shimming piece is made of ferromagnetic material, and this shimming piece can pass through shimming piece web member relative fixed with described fixed head.Described pickup groove preferably adopts one group of axisymmetric groove structure, distributes along the circumferential equal angles of superconducting magnet, and the quantity of pickup groove is 12～36 usually.Pickup groove and magnet inwall or gradient coil outer wall are fixed, also can be made as one with magnet or gradient coil.Pickup groove has consistent xsect vertically along the axial extension of superconducting magnet.
Pickup groove described in the optimal technical scheme of the present invention exists at interval between any two, and this is used to place described shimming material fixed head at interval.The quantity of fixed head is consistent with described pickup groove.Described a plurality of shimming material fixed head distributes axisymmetricly with respect to the central shaft of superconducting magnet.There are fixing or dismountable shimming piece web member on the described shimming material fixed head, are used to install the shimming piece.These shimming piece web members can be screw, draw-in groove, or other form.The shimming piece can be the thin slice of rectangular tab, thin rounded flakes or other shapes, and the magnetic property that can by volume reach material is divided into 1～6 kind of specification.
More in the optimized technical scheme on the shimming material fixed head fixedly the position of shimming piece be consistent, and these positions are symmetrically distributed about the plane of symmetry of the non-shaft section of magnet; On the described fixed head fixedly the quantity of the position of shimming piece can be 10～30.
According to the physical characteristics of material, in magnetic field, place the Distribution of Magnetic Field that ferromagnetic material can change its present position surrounding space.This specific character according to ferromagnetic material, ad-hoc location in superconducting magnet is placed ferromagnetic material, particularly the inwall of superconducting magnet or gradient coil outer wall are provided with the Distribution of Magnetic Field that ferromagnetic material changes local space, thereby realize regulating the inhomogeneity purpose of surveyed area internal magnetic field.
With respect to Magnetic resonance imaging equipment of the prior art, the present invention has following beneficial effect:
1, in the technical solution of the present invention at the SUPERCONDUCTING MAGNET DESIGN of Magnetic resonance imaging equipment regulate the device of uniformity of magnetic field, this device is divided into some groups with shimming piece opsition dependent, be convenient to the adjustment in groups of shimming piece, the work that magnetic field is regulated is more simple, convenient.
2, owing to magnetic field regulating device in the technical solution of the present invention is easy to dismounting relatively, the web member that only needs to unclamp shimming piece fixed head can be pulled down whole fixed head, thereby can carry out the position and the form adjustment of shimming piece, better meet shimming and regulated the characteristic that needs repeated multiple times to carry out.
3, will regulate the outer wall of the structural design of shimming in the technical solution of the present invention at the aperture of superconducting magnet inwall or gradient coil, more help utilizing magnet aperture volume inside, save the use of radial space to greatest extent, for surveyed area leaves enough spaces.
In sum, the present invention is directed to Magnetic resonance imaging equipment SUPERCONDUCTING MAGNET DESIGN a kind ofly adopt near the space of the magnet inwall of surveyed area ferromagnetic material with fritter to be fixed to carry out method and the device thereof that uniformity of magnetic field is adjusted on the magnet inwall, by ferromagnetic material the influence in surrounding space magnetic field is finely tuned the Distribution of Magnetic Field of surveyed area, thereby make the surveyed area internal magnetic field of magnet satisfy higher uniformity coefficient requirement.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is the assembly structure synoptic diagram of the magnetic field regulating device of embodiment of the invention Magnetic resonance imaging equipment; Wherein Magnetic resonance imaging equipment superconducting magnet includes gradient coil, and the magnetic field regulating device is arranged on the superconducting magnet inwall;
Fig. 2 is the structural representation of the magnetic field regulating device of embodiment of the invention Magnetic resonance imaging equipment; Fixing shimming piece wherein;
Fig. 3 is the A place enlarged drawing of Fig. 2;
Fig. 4 is the shimming block structure enlarged drawing of the magnetic field regulating device of embodiment of the invention Magnetic resonance imaging equipment; Wherein the shimming piece is a rectangular tab;
Fig. 5 is the shimming block structure enlarged drawing of the magnetic field regulating device of embodiment of the invention Magnetic resonance imaging equipment; Wherein the shimming piece is a thin rounded flakes;
Fig. 6 is the structural representation of the magnetic field regulating device of another embodiment of the present invention Magnetic resonance imaging equipment; Wherein Magnetic resonance imaging equipment superconducting magnet includes gradient coil, and the magnetic field regulating device is arranged on the gradient coil outer wall;
Fig. 7 is the magnetic field regulating device of Fig. 6 center MR imaging apparatus and the connection diagram of gradient outer ring;
Fig. 8 is the assembly structure synoptic diagram of the magnetic field regulating device of embodiment of the invention Magnetic resonance imaging equipment; Wherein Magnetic resonance imaging equipment superconducting magnet inwall and magnetic field regulating device integrated setting.
Wherein: 1 is the shimming piece, and 2 is superconducting magnet; 3 is gradient coil, and 4,41 is pickup groove, and 5 is the through hole on the shimming material fixed head; 6 is shimming material fixed head; 7 is the through hole on the shimming piece; 21 is the superconducting magnet inwall.
Embodiment
For the technical scheme of more detailed statement foregoing invention, the following inventor lists specific embodiment and comes bright technique effect; It is emphasized that these embodiment are used to the present invention is described and are not limited to limit the scope of the invention.
As Fig. 1～5, the aperture of this Magnetic resonance imaging equipment superconducting magnet is 920mm, axial length 1660mm.The device of regulating the superconducting magnet uniformity of magnetic field is positioned at the magnet inwall, comprises pickup groove, shimming piece fixed head, shimming piece and corresponding web member.
This regulating device is made up of pickup groove 4, shimming piece fixed head 6, shimming piece 1 and corresponding web member between Magnetic resonance imaging equipment superconducting magnet 2 and gradient coil 3.Several shimming pieces 1 that mainly are made of ferromagnetic material are set on superconducting magnet 2 inwalls, superconducting magnet 2 inwall equal angles axially are provided with 36 pickup grooves 4, described pickup groove fixedly installs the shimming material fixed head 6 with 10～30 through holes 5, and described shimming piece is fixed by through hole 5 and shimming material fixed head.
Shimming piece such as Fig. 4 or shown in Figure 5, for the cross section is the ferromagnetic thin slice of circle or rectangle, the setting of the middle part of described shimming piece cooperates fixing through hole 7 with through hole on the shimming material fixed head.Described shimming material fixed head is fixed in the pickup groove by the two ends through hole; On the described shimming material fixed head by several shimming pieces of the screw retention on the through hole.
A plurality of pickup grooves distribute along the circumferential equal angles of superconducting magnet, the fixing position consistency of shimming piece on the described fixed head, and be symmetrically distributed about the plane of symmetry of the non-shaft section of superconducting magnet; On described each fixed head fixedly the quantity of the position of shimming piece can be 10～30.
The aperture inwall 21 of pickup groove 4 and superconducting magnet 2 is consolidated by welding or bonding mode, or promptly is made of one man-hour adding.This group pickup groove 4 distributes along the circumferential equal angles of the aperture inwall 21 of superconducting magnet, has 36.
By in magnetic field, placing the Distribution of Magnetic Field that ferromagnetic material can change its present position surrounding space, promptly place the Distribution of Magnetic Field that ferromagnetic material changes local space, thereby realize regulating the inhomogeneity purpose of surveyed area internal magnetic field at the surveyed area of superconducting magnet.
Fig. 2 and Fig. 3 are the structural representation of magnetic field regulating device.Between one group of pickup groove 4, formed " protruding " type groove identical with pickup groove quantity, this groove axially connects superconducting magnet.Have the shimming piece fixed head 6 that matches with " protruding " type groove size and can be easily penetrate, until the other end from an end of " protruding " type groove.In the end of shimming piece fixed head 6, by aperture inwall 21 relative fixed of screw with itself and superconducting magnet.So shimming piece fixed head 6 is completely fixed, and can arbitrarily not move.
Fig. 4 and Fig. 5 are the synoptic diagram of the needed shimming piece of magnetic field regulating device.Wherein Figure 4 shows that rectangle shimming piece, there is a circular hole its center, is used for the fixing of itself and shimming piece fixed head 6.Figure 5 shows that circular shimming piece, there is a circular hole its center, is used for the fixing of itself and shimming piece fixed head 6.The magnetic property that the shimming piece can by volume reach material is divided into 1～6 kind of specification.When the practical adjustments magnetic field homogeneity, can select as required on the suitable position that suitable shimming piece is installed in shimming piece fixed head 6.
The physical dimension of shimming piece and shimming piece fixed head 6 are complementary, and can be installed in just on the ad-hoc location of shimming piece fixed head 6.These ad-hoc locations have the screw that is used for fixing the shimming piece, can pass the circular hole of shimming piece center just.After selected shimming piece installs, shimming piece and screw lock are got final product with nut.Generally speaking, the ad-hoc location that each shimming piece fixed head 6 is used for fixing the shimming piece is consistent, and these positions are about the plane of symmetry symmetrical distribution of the non-shaft section of magnet.On the shimming piece fixed head 6 fixedly the quantity of the position of shimming piece can be 10～30.
In the time of the practical adjustments magnetic field homogeneity, might on the same position of same shimming piece fixed head 6, place several shimming pieces, for making things convenient for the installation of shimming piece, generally need follow amplify earlier piece, after put fritter principle.
As Fig. 6 and Fig. 7, this regulating device is made up of pickup groove 41, shimming piece fixed head 6, shimming piece 1 and corresponding web member between Magnetic resonance imaging equipment superconducting magnet 2 and gradient coil 3.
The shimming piece is with embodiment 1, and as Fig. 4 or shown in Figure 5, for the cross section is the ferromagnetic thin slice of circle or rectangle, the setting of the middle part of described shimming piece cooperates fixing through hole 7 with through hole on the shimming material fixed head.Described shimming material fixed head is fixed in the pickup groove by the two ends through hole; On the described shimming material fixed head by several shimming pieces of the screw retention on the through hole.
A plurality of pickup grooves distribute along the circumferential equal angles of superconducting magnet, the fixing position consistency of shimming piece on the described fixed head, and be symmetrically distributed about the plane of symmetry of the non-shaft section of superconducting magnet; On described each fixed head fixedly the quantity of the position of shimming piece can be 10～30.
As shown in Figure 6, be the synoptic diagram of magnetic field regulating device and superconducting magnet (containing gradient coil).Governor motion is made up of pickup groove 41, shimming piece fixed head 6, shimming piece 1 and corresponding web member between superconducting magnet 2 and gradient coil 3.The outer wall of pickup groove 41 and gradient coil 3 is consolidated by welding or bonding mode, or promptly is made of one man-hour adding.This group pickup groove 41 distributes along the circumferential equal angles of the outer wall of gradient coil, has 24.
Fig. 7 is the assembling synoptic diagram of magnetic field regulating device and gradient coil.Between one group of pickup groove 41, formed " protruding " type groove identical with pickup groove quantity, this groove axially connects superconducting magnet.Have the shimming piece fixed head 6 that matches with " protruding " type groove size and can be easily penetrate, until the other end from an end of " protruding " type groove.In the end of shimming piece fixed head 6, by the outer wall relative fixed of screw with itself and gradient coil 3.So shimming piece fixed head 6 is completely fixed, and can arbitrarily not move.
Its physical dimension of shimming piece and shimming piece fixed head 6 are complementary, and can be installed in just on the ad-hoc location of shimming piece fixed head 6.These ad-hoc locations have the screw that is used for fixing the shimming piece, can pass the circular hole of shimming piece center just.After selected shimming piece installs, shimming piece and screw lock are got final product with nut.Generally speaking, the ad-hoc location that each shimming piece fixed head 6 is used for fixing the shimming piece is consistent, and these positions are about the plane of symmetry symmetrical distribution of the non-shaft section of magnet.On the shimming piece fixed head 6 fixedly the quantity of the position of shimming piece can be 10～30.
Certainly, can described superconducting magnet and pickup groove is integrated, and pickup groove distributes axisymmetricly with respect to the central shaft of superconducting magnet.Described pickup groove fixedly installs the shimming material fixed head 6 with 10～30 through holes 5, and mainly several shimming pieces 1 that are made of ferromagnetic material are fixed by through hole 5 and shimming material fixed head, as shown in Figure 8.And that this is those of ordinary skills is getable naturally according to the present invention, is included in protection scope of the present invention.
Above-mentioned example only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (6)
1. the magnetic field regulating device of a Magnetic resonance imaging equipment, it is characterized in that described magnetic field regulating device comprises a plurality of shimming pieces (1) that mainly are made of ferromagnetic material, described shimming piece is arranged on superconducting magnet (2) the inwall side of Magnetic resonance imaging equipment and fixes with the superconducting magnet inwall or fix with gradient coil (3) outer wall in the superconducting magnet.
2. the magnetic field regulating device of Magnetic resonance imaging equipment according to claim 1, it is characterized in that described superconducting magnet inwall or gradient coil outer wall equal angles axially are provided with several pickup grooves (4), described pickup groove fixedly installs the shimming material fixed head (6) with several through holes (5), and described shimming piece (1) is fixed by through hole and shimming material fixed head.
3. the magnetic field regulating device of Magnetic resonance imaging equipment according to claim 2 is characterized in that described pickup groove is concave slot (41), and described shimming material fixed head (6) is fixed in the pickup groove by the two ends through hole; Fix several shimming pieces by the shimming piece web member on the through hole on the described shimming material fixed head.
4. the magnetic field regulating device of Magnetic resonance imaging equipment according to claim 3 is characterized in that described pickup groove distributes along the circumferential equal angles of superconducting magnet, and its quantity is in 12～36 scopes; Described shimming piece web member is selected from screw, draw-in groove; The fixing position consistency of shimming piece on the described fixed head, and be symmetrically distributed about the plane of symmetry of the non-shaft section of superconducting magnet; On described each fixed head fixedly the quantity of the position of shimming piece can be 10～30.
5. the magnetic field regulating device of Magnetic resonance imaging equipment according to claim 2, it is characterized in that described pickup groove and superconducting magnet inwall (21) or gradient coil outer wall are wholely set, described pickup groove distributes axisymmetricly with respect to the central shaft of superconducting magnet.
6. the magnetic field regulating device of Magnetic resonance imaging equipment according to claim 1, it is characterized in that described shimming piece is that the cross section is circular or rectangular ferromagnetic thin slice, the middle part setting of described shimming piece cooperates fixing through hole (7) with through hole (5) on the shimming material fixed head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201425569U CN201548675U (en) | 2009-04-23 | 2009-04-23 | Field adjusting equipment of nuclear magnetic resonance imaging device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201425569U CN201548675U (en) | 2009-04-23 | 2009-04-23 | Field adjusting equipment of nuclear magnetic resonance imaging device |
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| CN201548675U true CN201548675U (en) | 2010-08-11 |
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| CN2009201425569U Expired - Lifetime CN201548675U (en) | 2009-04-23 | 2009-04-23 | Field adjusting equipment of nuclear magnetic resonance imaging device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122518A (en) * | 2013-04-25 | 2014-10-29 | 上海联影医疗科技有限公司 | Magnetic resonance imaging system and passive shimming device |
| CN109085519A (en) * | 2018-08-06 | 2018-12-25 | 杭州佩伟拓超导磁体技术有限公司 | Superconducting magnet magnetic field shimming system and method |
| CN109494041A (en) * | 2018-11-27 | 2019-03-19 | 上海联影医疗科技有限公司 | Superconducting magnet and the magnetic resonance imaging system for using the superconducting magnet |
-
2009
- 2009-04-23 CN CN2009201425569U patent/CN201548675U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122518A (en) * | 2013-04-25 | 2014-10-29 | 上海联影医疗科技有限公司 | Magnetic resonance imaging system and passive shimming device |
| CN104122518B (en) * | 2013-04-25 | 2017-12-22 | 上海联影医疗科技有限公司 | Magnetic resonance imaging system and its passive shimming device |
| CN109085519A (en) * | 2018-08-06 | 2018-12-25 | 杭州佩伟拓超导磁体技术有限公司 | Superconducting magnet magnetic field shimming system and method |
| CN109085519B (en) * | 2018-08-06 | 2024-01-23 | 杭州佩伟拓超导磁体技术有限公司 | Superconducting magnet magnetic field shimming system and method |
| CN109494041A (en) * | 2018-11-27 | 2019-03-19 | 上海联影医疗科技有限公司 | Superconducting magnet and the magnetic resonance imaging system for using the superconducting magnet |
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Owner name: SUZHOU ANKE MEDICAL SYSTEM CO., LTD. Free format text: FORMER OWNER: SUZHOU INDUSTRIAL PARK LONGRUN TECHNOLOGY CO., LTD. Effective date: 20110804 |
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Free format text: CORRECT: ADDRESS; FROM: 215123 SUZHOU, JIANGSU PROVINCE TO: 215126 SUZHOU, JIANGSU PROVINCE |
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Effective date of registration: 20110804 Address after: Xing Pu Road Suzhou City Industrial Park in Jiangsu province 215126 building K No. 128 Patentee after: Suzhou Anke Medical System Co., Ltd. Address before: Xinghu Street Industrial Park of Suzhou city in Jiangsu province 215123 No. 218 BioBAY A2 building 213A Patentee before: Suzhou Industrial Park Longrun Technology Co., Ltd. |
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Owner name: SUZHOU LANGRUN MEDICAL SYSTEM CO., LTD. Free format text: FORMER NAME: SUZHOU ANKE MEDICAL SYSTEM CO., LTD. |
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Address after: Xing Pu Road Suzhou City Industrial Park in Jiangsu province 215126 building K No. 128 Patentee after: SUZHOU LONWIN MEDICAL SYSTEMS CO., LTD. Address before: Xing Pu Road Suzhou City Industrial Park in Jiangsu province 215126 building K No. 128 Patentee before: Suzhou Anke Medical System Co., Ltd. |
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