CN103093953A - Method for manufacturing gradient active shimming coil - Google Patents
Method for manufacturing gradient active shimming coil Download PDFInfo
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- CN103093953A CN103093953A CN 201210255381 CN201210255381A CN103093953A CN 103093953 A CN103093953 A CN 103093953A CN 201210255381 CN201210255381 CN 201210255381 CN 201210255381 A CN201210255381 A CN 201210255381A CN 103093953 A CN103093953 A CN 103093953A
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Abstract
The invention relates to a method for manufacturing a gradient active shimming coil. The method comprises the following steps of: 1) inputting shape data of the active shimming coil into a numerical control machining machine tool, and carving a wire casing into which copper stranded wires are inlaid on a groove carving board by utilizing the numerical control machine tool; 2) embedding the copper stranded wires into the wire casing of the groove carving board; 3) brushing thermosetting resin on the surfaces of the copper stranded wires, wherein the heat conductivity of the resin is more than 1W/(m K); and 4) bonding the copper stranded wires on which resin is brushed on an epoxy board, pressing the epoxy board, so that the copper stranded wires and the epoxy board are fixed to be formed. The method has the advantages that a track wire casing of the active shimming coil is machined by utilizing the numerical control machine tool, so that the machining accuracy is high, and the machined groove carving board can be used repeatedly; and the manufacturing efficiency and accuracy of the coil can be improved greatly, the mass production of the gradient coil is facilitated, and the stability and uniformity of the shimming of a main magnetic field are ensured.
Description
Technical field
The present invention relates to a kind of magnetic resonance imaging system.The manufacture method of the active shimming coil of gradient coil in a kind of superconducting magnetic resonance imaging system.
Background technology
Magnetic resonance imaging is a new branch of science in applied science field, is also a kind of new imaging in Medical Imaging.it utilizes the magnetic core (proton) of imaging object in specific radio-frequency pulse excitation main field to produce resonance, by gradient magnetic, signal is carried out space encoding, gather resonance signal and obtain image by computer reconstruction, everything is all in the polarization of main field to sample, radiofrequency field excites with gradient fields realizing on image space pinpoint basis sample, the signal of measuring in the magnetic resonance imaging process comes from the frequency pulse of characteristic frequency and the resonance between the self-rotating nuclear magnetic moment, because the inhomogeneities of main field is very big on the formant width impact of free damping signal, and the width of formant is having a strong impact on the quality of imaging.Therefore, all magnetic resonance imaging systems all can relate to the shimming problem of main field.
Mr imaging technique not only requires higher stationary magnetic field, also requires the stationary magnetic field to have higher uniformity.Because the higher main field uniformity is conducive to improve the signal to noise ratio of image, the uniformity in magnetic field is the prerequisite that guarantees magnetic resonance imaging signal space orientation accuracy; The uniformity in magnetic field can also reduce pseudo-shadow, particularly magnetic susceptibility artifact; Magnetic field also helps wide-field scanning highly uniformly, and especially the magnetic resonant imaging examination of shoulder joint isogonic center, carry out fat suppression scanning because only have highly uniform magnetic field just can take full advantage of fatty saturation technique.
The method for shimming of magnetic resonance imaging system has two kinds: a kind of is passive shimming method, and another kind is the active shimming method.So-called passive shimming method is exactly to add special-purpose shimming iron plate to make the true field distortion on the inwall of the shimming hole of magnet, make it more near the magnetic field of Theoretical Design, reach required uniformity of magnetic field, this method changes the amplitude maximum of main field inhomogeneities, result is relatively stable, but be not easy often adjust and change, because this kind method for shimming does not need external power supply, so be called again passive shimming.
and so-called active shimming method refer to the superconducting magnetic body concentric face of cylinder on, many group small coils are installed, as the shimming first order coil, second order shim coil and three rank shim coils etc., by the current strength in each small coil of suitable adjusting, make its local magnetic field on every side change to regulate the whole uniformity of main field, the electric current of these coils can be used the method automatic setting of reverse optimization, therefore active shimming can be easily in system pulse train used carry out front and back or carry out simultaneously, can be used for eaily magnetic resonance imaging system, because this kind method for shimming needs external power supply to control, so be called again active shimming.In the process of active shimming, the quality of shim power plays vital effect to the shimming effect, because shim power when fluctuation, does not only reach the purpose of shimming, and also may making originally, inhomogeneous main field becomes poorer.
The making of traditional gradient active shimming coil is when gradient coil is assembled, and the mylar of printing is sticked on the periphery of main coil, and the coil track line that then utilizes copper conductor to print on the mylar is directly made in position.In this manufacture method, due to the scrambling of main coil periphery, be difficult to guarantee the installation accuracy of active shim coil; Because this kind method is making on the face of cylinder, also can have a greatly reduced quality on make efficiency simultaneously.
Summary of the invention
In order to overcome low precision that existing gradient shim coil makes and the problem of low make efficiency, the invention provides a kind of method of brand-new making gradient active shimming coil, manufacture method of the present invention, make simple, production efficiency is high, has very high magnetic field homogeneity and the linearity uniformly with the gradient active shimming coil of its making.
The technical solution adopted in the present invention is a kind of manufacture method for gradient active shimming coil, comprises the following steps:
1) with the shape data input numerical control machine tool of active shimming coil, then utilize Digit Control Machine Tool to scribe the wire casing of damascene copper twisted wire on the cutting plate;
2) wire casing at the cutting plate is embedded in copper stranded conductor;
3) at the surperficial spary thermosetting resin of described copper stranded conductor, the conductive coefficient of resin is greater than 1W/ (mK);
4) copper stranded conductor of spary resin is bonded on epoxy plate and presses epoxy plate make copper stranded conductor fixed-type with it.
Further, the thickness 〉=2mm of described cutting plate.
Further, the wire casing degree of depth on described cutting plate is 1mm, and width is 1.1mm.
Further, described epoxy plate thickness is 0.2mm.
Further, the material of described cutting plate is Teflon.
Further, described copper stranded conductor is the bare copper stranded wire of high temperature copper stranded conductor or naked layer, and the conductive cross-sectional area of copper stranded conductor is greater than 1mm
2
The present invention contrasts prior art following beneficial effect: utilize the track wire casing of the active shim coil of Digit Control Machine Tool processing, have very high machining accuracy, and the cutting plate that machines can be unlimited reuses; Along wire casing coiling copper stranded conductor, greatly improve the make efficiency of coil and the precision of coil on the cutting plate, be beneficial to the volume production of gradient coil; When the active shim coil of assembling, utilize the location hole on epoxy plate to position, the not impact of acceptor's coil periphery shape has higher installation accuracy, has guaranteed stability and the uniformity of main field shimming.
Description of drawings
Fig. 1 is the structural representation that gradient active shimming coil is made according to the present invention.
In figure: 1 is that cutting plate, 2 is that copper stranded conductor, 3 is that wire casing, 4 is epoxy plate.
Embodiment:
Below the invention will be further described by embodiment:
The structural representation that gradient active shimming coil of the present invention is made as shown in Figure 1, its concrete manufacture method includes the following step: 1) with the shape data input numerical control machine tool of active shimming coil, then utilize Digit Control Machine Tool to scribe the wire casing of damascene copper twisted wire on the cutting plate;
2) wire casing at the cutting plate is embedded in copper stranded conductor;
3) at the surperficial spary thermosetting resin of described copper stranded conductor, the conductive coefficient of resin is greater than 1W/ (mK);
4) copper stranded conductor of spary resin is bonded on epoxy plate and presses epoxy plate make copper stranded conductor fixed-type with it.
Utilize numerical control machine tool to scribe wire casing on the cutting plate, and then copper stranded conductor is placed in wire casing and the spary thermosetting resin makes the copper stranded conductor typing, and then put epoxy plate lid outside copper stranded conductor and utilize resin make copper stranded conductor and epoxy plate fixed-type (in use, the heat that copper stranded conductor produces can in time outwards distribute by resin, guarantee the job stability of coil), when copper stranded conductor and epoxy plate fixed-type after, takes out copper stranded conductor and get final product, and the cutting plate is also reusable.Adopt this mode to make coil and compare with traditional coil employing copper stranded conductor and the manual coiling of flat type copper wire, its coiling precision is more accurate, and error is less, thereby the field uniformity that can correspondingly dwindle the fingerprint coil is poor; Simultaneously, also can adjust at any time as required the conductive cross-sectional area of fingerprint coil, as the thickness that increases copper plate and cutting width just can, compare with flat type copper wire with copper stranded conductor, have larger current-carrying sectional area and resistance less.
In the present embodiment, for ease of scribing wire casing, the thickness 〉=2mm of described cutting plate, the thickness of preferred 2mm cutting plate can be decided according to the diameter of copper stranded conductor, as larger in the copper stranded conductor diameter, certainly will cause the degree of depth of wire casing to be deepened, the thickness that so just need to thicken the cutting plate guarantees the degree of depth of wire casing; And adopt in the present embodiment the thickness of 2mm to satisfy the demands, therefore, the execution mode of the present embodiment is preferred implementation.
In the present embodiment, coiling for ease of coil, the wire casing degree of depth on described cutting plate is 1mm, width is 1.1mm, the wire casing degree of depth and width can be decided according to the diameter of copper stranded conductor, diameter as copper stranded conductor is excessive, and the intensification wire casing degree of depth and the width that need phase just to answer so just are convenient to copper stranded conductor and are placed in wire casing; Diameter as copper stranded conductor is less, can reduce the degree of depth and the width of wire casing, in order to avoid the degree of depth of wire casing and width are excessive, affects the gap within coil, affects the field uniformity deviation of coil.
In the present embodiment, for ease of the copper stranded conductor coil is fixed moulding, described epoxy plate thickness is 0.2mm.
In the present embodiment, the material of described cutting plate is Teflon, because Teflon has preferably not viscosity, like this in copper stranded conductor embeds wire casing during the spary ester moulding, resin can be mutually not bonding with the cutting plate, thereby be convenient to the groove that takes off of coil, makes the cutting plate possess reusability.
In the present embodiment, be to guarantee the conductivity of coil, described copper stranded conductor is that the conductive cross-sectional area of bare copper stranded wire copper stranded conductor of high temperature copper stranded conductor or naked layer is greater than 1mm
2
Making flow process of the present invention:
1, choose a thickness for greater than 2mm and the size Teflon sheet material greater than 1.10m X 1.50m, and be fixed on the platform of numerical control machine tool;
2, in the computer control system with the Theoretical Design data importing numerical control machine tool of active shimming coil, set and complete every machined parameters, wherein groove depth is 1.00mm, and width is 1.10mm; The operation numerical control machine tool, lathe is scribed wire casing by setup parameter on the cutting plate;
3, take off the cutting plate 1 that machines and clean air-dry (or oven dry);
4, with conductive cross-sectional area greater than 1mm
2Multiply bare copper stranded wire 2 groove along the line embed in cutting plate 3;
5, to the resin of the multiply bare copper stranded wire surface brush one deck conductive coefficient in wire casing greater than 1W/ (mK), then cover the thick epoxy plate of one deck 0.2mm 4 thereon;
6, utilize dull and stereotyped weight to average on epoxy plate 4 and exert pressure, make bare copper stranded wire 2 and thin epoxy plate 4 strong bond, curing molding also makes copper stranded conductor break away from wire casing, and the cutting plate can reuse, and repeats the coiling that above step is completed coil again.
Utilize the parameters of the coil of the coil of cutting plate of the present invention coiling and conventional method coiling to see Table 1:
Table 1
Be below only the preferred embodiment of the present invention, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with the claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a manufacture method that is used for gradient active shimming coil, comprise the following steps:
1) with the shape data input numerical control machine tool of active shimming coil, then utilize Digit Control Machine Tool to scribe the wire casing of damascene copper twisted wire on the cutting plate;
2) wire casing at the cutting plate is embedded in copper stranded conductor; Rrrrrrfvgc
3) at the surperficial spary thermosetting resin of described copper stranded conductor, the conductive coefficient of resin is greater than 1W/ (mK);
4) copper stranded conductor of spary resin is bonded on epoxy plate and presses epoxy plate make copper stranded conductor fixed-type with it.
2. the manufacture method for gradient active shimming coil as claimed in claim 1, is characterized in that: the thickness 〉=2mm of described cutting plate.
3. the manufacture method for gradient active shimming coil as claimed in claim 1, it is characterized in that: the wire casing degree of depth on described cutting plate is 1mm, width is 1.1mm.
4. the manufacture method for gradient active shimming coil as claimed in claim 1, it is characterized in that: described epoxy plate thickness is 0.2mm.
5. the manufacture method for gradient active shimming coil as claimed in claim 1, it is characterized in that: the material of described cutting plate is Teflon.
6. the manufacture method for gradient active shimming coil as claimed in claim 1 is characterized in that: described copper stranded conductor is that the bare copper stranded wire of high temperature copper stranded conductor or naked layer and conductive cross-sectional area are greater than 1mm
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210255381 CN103093953A (en) | 2012-07-19 | 2012-07-19 | Method for manufacturing gradient active shimming coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210255381 CN103093953A (en) | 2012-07-19 | 2012-07-19 | Method for manufacturing gradient active shimming coil |
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| CN103093953A true CN103093953A (en) | 2013-05-08 |
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| CN 201210255381 Pending CN103093953A (en) | 2012-07-19 | 2012-07-19 | Method for manufacturing gradient active shimming coil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344928A (en) * | 2013-06-21 | 2013-10-09 | 厦门大学 | Gradient shimming method for overcoming convection effect on nuclear magnetic resonance spectrometer |
| CN111665466A (en) * | 2020-08-07 | 2020-09-15 | 山东奥新医疗科技有限公司 | Roller type engraving processing method of gradient coil |
-
2012
- 2012-07-19 CN CN 201210255381 patent/CN103093953A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344928A (en) * | 2013-06-21 | 2013-10-09 | 厦门大学 | Gradient shimming method for overcoming convection effect on nuclear magnetic resonance spectrometer |
| CN103344928B (en) * | 2013-06-21 | 2015-10-14 | 厦门大学 | Nuclear magnetic resonance spectrometer overcomes the gradient method for shimming of convection effect |
| CN111665466A (en) * | 2020-08-07 | 2020-09-15 | 山东奥新医疗科技有限公司 | Roller type engraving processing method of gradient coil |
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Addressee: Nanjing Mai Fei Electronic Technology Co., Ltd. Pang Zongqiang Document name: Notification to Make Rectification |
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Application publication date: 20130508 |