CN205120949U - A gradient coil for joint magnetic resonance imaging - Google Patents
A gradient coil for joint magnetic resonance imaging Download PDFInfo
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- CN205120949U CN205120949U CN201520403024.1U CN201520403024U CN205120949U CN 205120949 U CN205120949 U CN 205120949U CN 201520403024 U CN201520403024 U CN 201520403024U CN 205120949 U CN205120949 U CN 205120949U
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims description 2
- 230000004308 accommodation Effects 0.000 claims 1
- 238000003384 imaging method Methods 0.000 abstract description 16
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 14
- 238000004804 winding Methods 0.000 description 4
- 238000003745 diagnosis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 210000000544 articulatio talocruralis Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000005067 joint tissue Anatomy 0.000 description 1
- 210000000629 knee joint Anatomy 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 210000003857 wrist joint Anatomy 0.000 description 1
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- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The utility model provides a gradient coil for joint magnetic resonance imaging, by forming in main gradient coil layer and shielded coil layer, main gradient coil layer and shielded coil layer all include the gradient coil of X, Y, the three orientation of Z, the main coil and the shielded coil of every orientation are formed by the cutting of two -layer copper sheet, upper and lower stacking, be convenient for current loop and increase gradient value. Reserve the interval between thread ring layer and the gradient coil layer for arrange shimming groove and water cooling channel. Foretell gradient coil has the advantage of length short (being not more than 480mm), gradient field intensity high (can reach 70mTm), gradient linearity degree good (being superior to - 2%-+ 2%), for full -length imaging system's gradient coil, can improve the contrast of formation of image greatly, is particularly suitable for the joint formation of image.
Description
Technical field
The invention belongs to magnetic resonance imaging arts, particularly a kind of gradient coil for joint magnetic resonance imaging.
Background technology
Magnetic resonance imaging (MagneticResonanceImaging, MRI) system comprises magnet system, gradient system, radio system and computer generated image system, is a kind of important Image detection means of current medical circle.Wherein, the effect of gradient system is in imaging region, provide the linear gradient magnetic that can switch fast, for magnetic resonance radio frequency scanning provides space encoding information.The gradient coil product length of (eighties in last century) is longer in early days, and switching rate is low, and gradient linearity degree is lower, and the gradient of generation also more weak (being less than 20mT/m).Through the development of nearly 40 years, gradient coil was to short cavity, high gradient field, high switching rate, high efficiency future development.
Joint MR imaging apparatus is the feature for joint tissue (as wrist joint, ankle-joint, knee joint etc.), is specifically designed to the magnetic resonance equipment of joint diagnosis.For whole body imaging equipment, image contrast is high, and diagnosis effect is good.Trace it to its cause, mainly because the gradient coil of joint imaging device is far superior to whole body imaging equipment.Relative to the gradient coil of whole body imaging equipment, because the gradient coil aperture of joint imaging is little, generally between 200mm ~ 220mm (whole body imaging gradient coil aperture: about 680 ~ 700mm), more high gradient field intensity therefore can be realized.At 20 ~ 30mT/m as the gradient coil of whole body imaging equipment, and the gradient coil of joint imaging can realize 60mT/m, even higher; Little another advantage brought in gradient coil aperture is that inductance value is little, thus gradient switching rate is high, therefore adapts to the needs that in rapid scanning sequence, gradient pulse rises fast and overturns.
At present, Jin You General Electric (U.S.A.) (GE) company is proposed the magnetic resonance equipment of joint imaging.The joint imaging magnetic resonance gradient coil that the present invention proposes possesses high-performance, may be used for joint imaging device.
Summary of the invention
The present invention proposes a kind of gradient coil for joint magnetic resonance imaging, realizes index to be: gradient coil length is not more than 480mm; Gradient strength reaches 70mT/m; Imaging region is the ball territory of 160mm; Gradient linearity degree is better than-2% ~+2%.
The technical solution used in the present invention is as follows:
For the gradient coil of joint magnetic resonance imaging, be made up of main gradient coil layer and shielding line ring layer, main gradient coil layer and shielding line ring layer include the gradient coil in X, Y, Z tri-directions.Wherein, x-ray circle is identical with Y coil shape, and Y coil radius is greater than x-ray circle.During installation, Y coil relative to x-ray circle around z-axis 90-degree rotation.X-ray circle is positioned at innermost layer, and Y coil is positioned at middle layer, and Z coil is positioned at outermost layer.The length of main line ring layer is less than shielding line ring layer, to shield stray magnetic field better.
The main coil in every direction and potted coil are all formed by the cutting of two-layer copper sheet, upper and lowerly stack, and each circle copper sheet wiring the upper and lower, junction are contrary, ensure that the wire of upper and lower layer correspondence position flows through equidirectional electric current, thus produce equidirectional magnetic field.Such wire laying mode is convenient to current return and is increased Grad.
Prepared separation between main line ring layer and shielding line ring layer, for arranging shimming groove and water-cooling channel.
Accompanying drawing illustrates [0004]
Fig. 1 is the gradient coil structures schematic diagram for joint magnetic resonance imaging;
Fig. 2 is the gradient coil structures schematic diagram for joint magnetic resonance imaging
Fig. 3 is X or Y coil main coil wiring diagram;
Fig. 4 is X or Y coil potted coil wiring diagram;
Fig. 5 is X or Y coil 3-D view;
Fig. 6 is X/Y coil double layer copper sheet schematic wiring diagram;
Fig. 7 is in the plane of Y=0, and in the region of x ∈ (-0.08m ,+0.08m), z ∈ (-0.08m ,+0.08m), x-ray circle produces Distribution of Magnetic Field figure;
Fig. 8 is Z coil main coil wiring diagram;
Fig. 9 is Z coil potted coil wiring diagram;
Figure 10 is Z coil 3-D view;
Figure 11 is in the plane of Y=0, and in the region of x ∈ (-0.08m ,+0.08m), z ∈ (-0.08m ,+0.08m), Z coil produces Distribution of Magnetic Field figure.
Embodiment [0005]
The present invention is further illustrated below in conjunction with the drawings and the specific embodiments.
Fig. 1 is the gradient coil structures schematic diagram for joint magnetic resonance imaging.Skin is shielding line ring layer, and one embodiment of the present of invention length is 480mm, and be Z, Y and x-ray circle screen layer from outside to inside, diameter is respectively Zs, Ys and Xs.Internal layer is served as theme ring layer, and one embodiment of the present of invention length is 440mm, is respectively Zm, Ym and Xm according to the descending order in diameter footpath.Be shimming groove and water-cooling channel between main line ring layer and shielding line ring layer, interval is greater than 15mm.The ball territory of imaging region to be radius be 80mm.
Following is a list embodiment coil wire location:
X-ray circle: main stor(e)y Xm=206mm; Screen layer Xs=256mm;
Y coil: main stor(e)y Ym=212mm; Screen layer Ys=262mm;
Z coil: main stor(e)y Zm=218mm; Screen layer Zs=268mm;
Fig. 3 is X or Y coil main coil wiring diagram, and Fig. 4 is X or Y coil potted coil wiring diagram.Coordinate definition is: ordinate is axial coordinate Z, and with rice (m) for unit, horizontal ordinate is the angle Theta on periphery, and with radian (rad) for unit, Fig. 4, Fig. 5 coordinate definition is below identical therewith.In Fig. 3, upper left, bottom right coil lead to positive current; Upper right, lower-left coil lead to negative current.In Fig. 4, upper left, bottom right coil lead to negative current; Upper right, lower-left coil lead to positive current.Fig. 5 is the 3-D view of X or Y coil, and skin is potted coil, and internal layer is served as theme circle.The wiring shape of Y coil is identical with x-ray circle, but cylinder radius is slightly larger than x-ray circle, during installation and x-ray circle along Z-direction 90-degree rotation.
Fig. 6 is X/Y coil double layer copper sheet schematic wiring diagram.X/Y main coil and potted coil include four windings, and schematic diagram is only got a coil winding and is described.Enclose wire inflow current from the wiring copper sheet outermost one of top, electric current, along routing to hub of a spool, then flows out from center A point, flows into lower floor center B point, finally encloses from lower floor's outermost one and flows out.Each circle copper sheet wiring the upper and lower, junction are contrary, ensure that the wire of upper and lower layer correspondence position flows through equidirectional electric current, produce equidirectional magnetic field, two-layer layout and then field intensity can be made to double.
Fig. 7 is in the plane of Y=0, and in the region of x ∈ (-0.08m ,+0.08m), z ∈ (-0.08m ,+0.08m), x-ray circle produces Distribution of Magnetic Field figure.Find in the calculating of the embodiment of the present invention, for the ball territory of 160mm, in Y=0 plane inside gradient magnetic field, the linearity is the poorest, gets region X=-0.08m ~ 0.08m, Z=-0.08m ~ 0.08m, obtains theoretical linear degree :-1.84% ~+1.84%.By calculating, work as two-layer wiring, when working current is 69.12A, gradient strength reaches 70.2mT/m, and gradient efficiency reaches 1.0mT/m/A.
Fig. 8 is Z coil main coil wiring diagram, can be regarded as the ring-shaped current along z-axis distribution.Deep winding current is just, the electric current of central area coiling is negative.Fig. 9 is Z coil potted coil wiring diagram, and direction of current is contrary with main coil, and deep winding current is negative, and the electric current of central area coiling is just.Figure 10 is Z gradient coil 3-D view, and skin is potted coil, and internal layer is served as theme circle.
Figure 11 is in the plane of Y=0, and in the region of x ∈ (-0.08m ,+0.08m), z ∈ (-0.08m ,+0.08m), Z coil produces Distribution of Magnetic Field figure.Find in the calculating of the embodiment of the present invention, for the ball territory of 160mm, in Y=0 plane, get region X=-0.08m ~ 0.08m, Z=-0.08m ~ 0.08m, obtain theoretical linear degree :-1.60% ~+1.60%.By calculating, work as two-layer wiring, when working current is 50.04A, gradient strength reaches 70.4mT/m, and gradient efficiency reaches 1.4mT/m/A.
Claims (3)
1. for the gradient coil of joint magnetic resonance imaging, be made up of main gradient coil layer and shielding line ring layer, main gradient coil layer and shielding line ring layer include the gradient coil in X, Y, Z tri-directions.The main coil in each direction and potted coil stack together by two-layer copper sheet is upper and lower, the structure of whole gradient coil is made up of 12 layers of copper sheet coil, wire inflow current is enclosed by the wiring copper sheet outermost one of top, electric current is along routing to hub of a spool, then flow into from lower floor's central point, finally enclose from lower floor's outermost one and flow out, each circle copper sheet wiring the upper and lower, junction are contrary, ensure that the wire of upper and lower layer correspondence position flows through equidirectional electric current, thus produce equidirectional magnetic field, two-layer copper sheet coil is for individual layer, and field intensity doubles.
2. according to the gradient coil for joint magnetic resonance imaging according to claim 1, it is characterized in that: accommodation joint conveniently, require the little 480mm of gradient coil length.
3. according to the gradient coil for joint magnetic resonance imaging according to claim 1, it is characterized in that: prepared separation between main line ring layer and shielding line ring layer, for arranging shimming groove and water-cooling channel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520403024.1U CN205120949U (en) | 2015-06-12 | 2015-06-12 | A gradient coil for joint magnetic resonance imaging |
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| CN201520403024.1U CN205120949U (en) | 2015-06-12 | 2015-06-12 | A gradient coil for joint magnetic resonance imaging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106610479A (en) * | 2017-01-03 | 2017-05-03 | 中国科学院苏州生物医学工程技术研究所 | Gradient device and system for magnetic resonance imaging equipment |
| CN107957565A (en) * | 2017-12-21 | 2018-04-24 | 武汉中科牛津波谱技术有限公司 | A kind of nuclear magnetic resonance chemical analyser self-shielded gradient coils and its design method |
| CN109696645A (en) * | 2018-12-29 | 2019-04-30 | 佛山瑞加图医疗科技有限公司 | A kind of non-planar gradient coil |
-
2015
- 2015-06-12 CN CN201520403024.1U patent/CN205120949U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106610479A (en) * | 2017-01-03 | 2017-05-03 | 中国科学院苏州生物医学工程技术研究所 | Gradient device and system for magnetic resonance imaging equipment |
| CN106610479B (en) * | 2017-01-03 | 2023-12-19 | 中国科学院苏州生物医学工程技术研究所 | Gradient device and system of magnetic resonance imaging equipment |
| CN107957565A (en) * | 2017-12-21 | 2018-04-24 | 武汉中科牛津波谱技术有限公司 | A kind of nuclear magnetic resonance chemical analyser self-shielded gradient coils and its design method |
| CN109696645A (en) * | 2018-12-29 | 2019-04-30 | 佛山瑞加图医疗科技有限公司 | A kind of non-planar gradient coil |
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| C14 | Grant of patent or utility model | ||
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Effective date of registration: 20160517 Address after: 100085, No. 28, information road, No. 12, block D, 12A-2-023, Beijing, Haidian District Patentee after: Beijing cloud Ruida science and Technology Center (L.P.) Address before: 100085 Beijing city Haidian District on the 28 Street Hospital No. 2 Building 3 layer 308 Patentee before: BEIJING SPEC TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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Inventor after: Zhu Taotao Inventor before: Lin Haiyang |
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| CB03 | Change of inventor or designer information | ||
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Effective date of registration: 20170629 Address after: 100085 Beijing city Haidian District on the 28 Street Hospital No. 2 Building 3 layer 308 Patentee after: BEIJING SPEC TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 100085, No. 28, information road, No. 12, block D, 12A-2-023, Beijing, Haidian District Patentee before: Beijing cloud Ruida science and Technology Center (L.P.) |
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