CN201548675U - Magnetic field adjusting device of nuclear magnetic resonance imaging equipment - Google Patents

Magnetic field adjusting device of nuclear magnetic resonance imaging equipment Download PDF

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Publication number
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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China
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shimming
magnetic field
superconducting magnet
resonance imaging
fixed
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Expired - Lifetime
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CN2009201425569U
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Chinese (zh)
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唐昕
张琳
王为民
韩宝辉
王涛
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Suzhou Lonwin Medical Systems Co Ltd
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Suzhou Industrial Park Langrun Technology Co ltd
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Abstract

The utility model discloses a magnetic field adjusting device of nuclear magnetic resonance imaging equipment, the device is including a plurality of even field pieces (1) that mainly constitute by ferromagnetic material, even field piece sets up in the superconducting magnet (2) inner wall side of nuclear magnetic resonance imaging equipment and fixed or fixed with gradient coil (3) outer wall in the superconducting magnet with the superconducting magnet inner wall. The magnetic field distribution of the detection area is finely adjusted by the influence of the ferromagnetic material on the magnetic field of the surrounding space, so that the magnetic field in the detection area of the magnet meets the requirement of higher uniformity.

Description

The magnetic field regulating device of Magnetic resonance imaging equipment
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.
Embodiment 1 superconducting magnet inwall is provided with the Magnetic resonance imaging equipment (band gradient coil) of magnetic field regulating device
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.
Embodiment 2 gradient coil outer walls are provided with the Magnetic resonance imaging equipment (band gradient coil) of magnetic field regulating device
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.
Gradient coil 3 outer wall equal angles axially are provided with 24 pickup grooves 4, (be preferably be 12 multiple) 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.
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.
Pickup groove 41 and gradient coil 3 outer walls are consolidated by welding or bonding mode.This group pickup groove 4 distributes along the circumferential equal angles of gradient coil 3 outer walls, has 24.
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)

1.一种核磁共振成像设备的磁场调节装置，其特征在于所述磁场调节装置包括主要由铁磁材料构成的复数个匀场块(1)，所述匀场块设置在核磁共振成像设备的超导磁体(2)内壁侧并与超导磁体内壁固定或与超导磁体内的梯度线圈(3)外壁固定。1. A magnetic field adjustment device for nuclear magnetic resonance imaging equipment, characterized in that said magnetic field adjustment device comprises a plurality of shim blocks (1) mainly made of ferromagnetic materials, said shim block is arranged on the magnetic resonance imaging equipment The side of the inner wall of the superconducting magnet (2) is fixed to the inner wall of the superconducting magnet or to the outer wall of the gradient coil (3) in the superconducting magnet. 2.根据权利要求1所述的核磁共振成像设备的磁场调节装置，其特征在于所述超导磁体内壁或梯度线圈外壁等角度轴向设置有数个固定槽(4)，所述固定槽固定设置具有数个通孔(5)的匀场材料固定板(6)，所述匀场块(1)通过通孔与匀场材料固定板固定。2. The magnetic field adjustment device of nuclear magnetic resonance imaging equipment according to claim 1, characterized in that the inner wall of the superconducting magnet or the outer wall of the gradient coil is axially provided with several fixed grooves (4), and the fixed grooves are fixedly arranged The shim material fixing plate (6) has several through holes (5), and the shim block (1) is fixed to the shim material fixing plate through the through holes. 3.根据权利要求2所述的核磁共振成像设备的磁场调节装置，其特征在于所述固定槽为凸型槽(41)，所述匀场材料固定板(6)通过两端通孔固定在固定槽内；所述匀场材料固定板上通过通孔上的匀场块连接件固定数个匀场块。3. The magnetic field adjustment device of nuclear magnetic resonance imaging equipment according to claim 2, characterized in that said fixing groove is a convex groove (41), and said shimming material fixing plate (6) is fixed on In the fixing groove; on the shimming material fixing plate, several shimming blocks are fixed through the shimming block connectors on the through holes. 4.根据权利要求3所述的核磁共振成像设备的磁场调节装置，其特征在于所述固定槽沿超导磁体周向等角度分布，其数量在12～36个范围内；所述匀场块连接件选自螺钉、卡槽；所述固定板上可固定匀场块的位置一致，且关于超导磁体非轴截面的对称面对称分布；所述每个固定板上固定匀场块的位置的数量可为10～30个。4. The magnetic field adjustment device of nuclear magnetic resonance imaging equipment according to claim 3, characterized in that said fixing grooves are equiangularly distributed along the circumferential direction of the superconducting magnet, and the number thereof is in the range of 12 to 36; said shimming block The connectors are selected from screws and card slots; the positions of the shimming blocks that can be fixed on the fixing plate are consistent, and are distributed symmetrically about the symmetry plane of the non-axial section of the superconducting magnet; the shimming blocks fixed on each of the fixing plates The number of positions may be 10-30. 5.根据权利要求2所述的核磁共振成像设备的磁场调节装置，其特征在于所述固定槽与超导磁体内壁(21)或梯度线圈外壁一体设置，所述固定槽相对于超导磁体的中心轴呈轴对称分布。5. The magnetic field adjusting device of nuclear magnetic resonance imaging equipment according to claim 2, is characterized in that described fixed groove and superconducting magnet inner wall (21) or gradient coil outer wall are integrally provided with, and described fixed groove is relative to superconducting magnet's The central axis is axisymmetrically distributed. 6.根据权利要求1所述的核磁共振成像设备的磁场调节装置，其特征在于所述匀场块为截面为圆形或长方形的铁磁薄片，所述匀场块的中部设置与匀场材料固定板上通孔(5)配合固定的通孔(7)。6. The magnetic field adjustment device of nuclear magnetic resonance imaging equipment according to claim 1, characterized in that the shimming block is a ferromagnetic sheet with a circular or rectangular cross-section, and the middle part of the shimming block is provided with a shimming material The through hole (5) on the fixed plate cooperates with the fixed through hole (7).
CN2009201425569U 2009-04-23 2009-04-23 Magnetic field adjusting device of nuclear magnetic resonance imaging equipment Expired - Lifetime CN201548675U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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