CN103744041A - Radio frequency coil apparatus used for magnetic resonance imaging - Google Patents
Radio frequency coil apparatus used for magnetic resonance imaging Download PDFInfo
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- CN103744041A CN103744041A CN201310733339.8A CN201310733339A CN103744041A CN 103744041 A CN103744041 A CN 103744041A CN 201310733339 A CN201310733339 A CN 201310733339A CN 103744041 A CN103744041 A CN 103744041A
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Abstract
The invention discloses a radio frequency coil apparatus used for magnetic resonance imaging. The radio frequency coil apparatus comprises a power divider, a top magnet, a bottom magnet, two radio frequency coil units arranged longitudinally, a top radio frequency shielding layer, and a bottom radio frequency shielding layer. The radio frequency coil units are connected with the power divider. The top radio frequency shielding layer and the bottom radio frequency shielding layer are arranged on the top sides and the bottom sides of the radio frequency coil units, respectively. The top radio frequency shielding layer and the bottom radio frequency shielding layer are in parallel and installed on the top magnet and the bottom magnet, respectively. The radio frequency coil units, the top radio frequency shielding layer, and the bottom radio frequency shielding layer are centrally symmetrical. The radio frequency coil apparatus is capable of increasing the converting efficiency of the radio frequency coil units while not being affected by a gradient coil on a gradient disc.
Description
Technical field
The present invention relates to a kind of coil device, especially relate to a kind of coil device that is applied to magnetic resonance system.
Background technology
In modern medical skill, magnetic resonance imaging system has been a kind of conventional Medical Devices.Radio-frequency coil is as the indispensable part of magnetic resonance imaging system, and its performance is very large to the performance impact of magnetic resonance imaging system.
Coil device mainly contains that quadrature is plate, two kinds of structures of vertical bar lead-type.China publication number CN101190127A, the patent document that name is called " a kind of radio-frequency coil of slab construction " discloses the plate radio-frequency coil of a kind of quadrature.China publication number CN1281183C, the patent document that name is called " a kind of coil device and method for making that is applied to magnetic resonance imaging system " discloses a kind of radio-frequency coil of vertical bar lead-type.
The structure of these two kinds of radio-frequency coils of the prior art is more complicated all, and conversion efficiency is not high enough.For guaranteeing performance and the opening of coil, existing radio-frequency coil in use generally all can be near gradient coil, when actual imaging, gradient coil can produce many heats, these heats can be transmitted on radio-frequency coil, the copper sheet of radio-frequency coil can expand with heat and contract with cold, and variation has occurred the inductance that is equivalent to like this coil, can cause the resonance frequency of radio-frequency coil to change.
Summary of the invention
Technical matters solved by the invention is to provide a kind of coil device that is applied to magnetic resonance imaging, can improve the conversion efficiency of radio-frequency coil unit, and can not be subject to the impact of gradient coil on gradient dish.
Technical scheme is as follows:
A kind of coil device that is applied to magnetic resonance imaging, comprise power divider, upper magnet and lower magnet, also comprise the radio-frequency coil unit of two longitudinal arrangements, upper radio shielding layer and lower radio shielding layer, described radio-frequency coil unit is connected with described power divider; Described upper radio shielding layer and described lower radio shielding layer lay respectively at the both sides up and down of described radio-frequency coil unit, and the plane of described upper radio shielding layer and described lower radio shielding layer is parallel to each other, and is arranged on respectively on upper magnet and lower magnet; Symmetric shape centered by described radio-frequency coil unit, upper radio shielding layer and lower radio shielding layer.
Further: the geometric center of described two radio-frequency coil unit with the main field center of described upper magnet and lower magnet point-blank.
Further: upper gradient dish and descending stair scale are embedded into respectively in described upper magnet and lower magnet, the upper surface of the lower surface of described upper gradient dish and described descending stair scale is highly consistent with upper magnet and lower magnet periphery respectively, and described upper radio shielding layer directly contacts with described descending stair scale with described upper gradient dish respectively with described lower radio shielding layer.
Further: described upper radio shielding layer and lower radio shielding layer have measure-alike breach four corner positions, and described breach is 200～400mm in directions X range of size, and the range of size of Y-direction is 150～300mm.
Further: the material of described upper radio shielding layer and lower radio shielding layer adopts double face copper or copper coin, and its thickness range is 0.1～2mm, and its planar dimension is to be no more than the diameter of described upper magnet and lower magnet.
Further: the structure of described radio-frequency coil unit comprises: shell, coil and metal forming; The described shell of nonmetallic materials be shaped as Central Symmetry shape, adapt with the shape of described coil; In the middle of the frame of described shell, be provided with inside groove, the described coil that outside is wound with described metal forming is arranged in described inside groove.
Further: the number of turns of described metal forming is 1～8 circle, and described coil is the coil of 1～8 circle that coiling direction is identical, between adjacent windings, with electric capacity, is coupled, and every turn coil is in series with electric capacity.
Further: described metal forming adopts Copper Foil.
Compared with prior art, the technology of the present invention effect comprises:
1, in the present invention, radio-frequency coil unit longitudinal arrangement, can improve the conversion efficiency of radio-frequency coil unit, and can not be subject to the impact of gradient coil on gradient dish.
2, in the present invention, by radio shielding layer, produce symmetrical radio frequency environment, have following advantage: (1) produces symmetrical radio frequency environment by radio shielding layer, gradient coil is not owing to there is no heat transmission between same radio-frequency coil unit, and radio-frequency coil unit resonance frequency can not be offset; (2) conversion efficiency is high, and radio-frequency power that only need to be very low can meet imaging requirements.
Accompanying drawing explanation
Fig. 1 is the structural representation of coil device in the present invention;
Fig. 2 is the structural representation of radio shielding layer in the present invention;
Fig. 3 is coiling and the connection diagram of radio-frequency coil unit coil in the present invention;
Fig. 4 is the sectional view of radio-frequency coil unit in the present invention.
Embodiment
Below with reference to accompanying drawing and preferred embodiment, technical solution of the present invention is elaborated.
As shown in Figure 1, be the structural representation of coil device in the present invention.
The structure of coil device comprises: two radio-frequency coil unit 1 and two radio shielding layers (upper radio shielding layer 2 and lower radio shielding layer 3), two radio-frequency coil unit 1 longitudinal arrangements, upper radio shielding layer 2 and lower radio shielding layer 3 lay respectively at the both sides up and down of radio-frequency coil unit 1, and the plane of upper radio shielding layer 2 and lower radio shielding layer 3 is parallel to each other, upper radio shielding layer 2 is identical with the structure of lower radio shielding layer 3.
Radio-frequency coil unit 1 Central Symmetry shape, radio-frequency coil unit 1 is connected with the power divider of magnetic resonance imaging system.The plane of two radio-frequency coil unit 1 is parallel to each other, can move, and the center of radio-frequency coil unit 1 is over against magnet center simultaneously, and the geometric center of two radio-frequency coil unit 1 with the main field center of magnet substantially point-blank.
Radio-frequency coil unit 1 is subject to the impact of environment larger, and the major function of radio shielding layer is to radio-frequency coil unit 1 being provided to a fixing radio frequency environment, and the radio-frequency field that can make radio-frequency coil unit 1 produce is simultaneously more even in Z direction.Because radio shielding layer adopts the better copper of conductance, so the loss of radio-frequency coil unit 1 in this radio frequency environment reduces, therefore can also improve the efficiency of radio-frequency coil unit 1 in addition.Wherein going up radio shielding layer 2 is installed on upper magnet, lower screen layer 3 is installed on lower magnet, because the volume of upper magnet and lower magnet is larger, upper gradient dish and descending stair scale are embedded into respectively upper magnet and lower magnet, on it, the upper surface of the lower surface of gradient dish and descending stair scale is highly consistent with upper magnet and lower magnet periphery respectively, and above radio shielding layer 2 directly contacts with descending stair scale with upper gradient dish with lower radio shielding layer 3.
As shown in Figure 2, be the structural representation of radio shielding layer in the present invention.
Upper radio shielding layer 2 and lower radio shielding layer 3 have measure-alike breach 4 four corner positions, its directions X range of size is 200～400mm, the range of size of Y-direction is 150～300mm, breach 4 is by rear formation is removed in 4 corners of upper radio shielding layer 2 and lower radio shielding layer 3, it is for enough large and symmetrical radio frequency environment is provided that breach 4 is set, thereby when radio-frequency coil unit 1 is moved, synthetic of the radio frequency of two radio-frequency coil unit 1 in certain limit, remains uniform field in magnet and efficiency remains unchanged.
Upper radio shielding layer 2 and lower radio shielding layer 3 are placed in parallel in magnet centre position, and upper radio shielding layer 2 and lower radio shielding layer 3 are strict Central Symmetry shape, preferably rectangle, annular or its distortion.It adopts material is double face copper or copper coin, and its thickness range is 0.1～2mm, and its planar dimension is to be no more than the diameter of magnet (upper magnet and lower magnet).
As shown in Figure 3, be coiling and the connection diagram of radio-frequency coil unit 1 coil 6 in the present invention.In radio-frequency coil unit 1, connect in the metal forming loop of every turn coil 6, and coiling direction is also identical, and radio-frequency coil unit 1 comprises the coil 6 of 1～8 circle that coiling direction is identical, between adjacent windings 6, with electric capacity 5, is coupled.The middle one or more electric capacity 5 of can connecting of every turn coil 6, the impact of load on coil 6 while having load can also be eliminated or reduce to the electric capacity 5 of series connection, for making each radio-frequency coil unit 1 be tuned in frequency of operation, simultaneously.The head of coil 6 first laps and the tail of last lap are connected on power combiner or power divider by radio-frequency cable.
In radio-frequency coil unit 1, the geometric configuration of coil 6 can be rectangle, ellipse or other Central Symmetry shapes.Its geometric center with the main field center of upper magnet and lower magnet point-blank.
As shown in Figure 4, be the sectional view of radio-frequency coil unit 1 in the present invention.The structure of radio-frequency coil unit 1 comprises: shell 7, coil 6, metal forming 8; The shape of the shell 7 of nonmetallic materials can be rectangle, ellipse or some other Central Symmetry shape, adapts with the shape of coil 6.Inside groove is positioned in the middle of the frame of shell 7, and the outside coil 6 that is wound around metal forming 8 is arranged in inside groove, and the number of turns of metal forming 8 is 1～8 circle, can fully with 4 inside grooves of shell 7, increase the number of turns.Wherein metal forming 8 adopts the reasonable Copper Foil of electric conductivity.
By regulating two distances between radio-frequency coil unit 1 and the size and dimension of each radio-frequency coil unit 1, can obtain the synthetic homogeneity range of good radio frequency, conversion efficiency is very high simultaneously.Through theoretical, calculate and experimental verification, the number of turns of coil 6 is more, and the radio frequency efficiency of coil device is higher, and when the number of turns how to a certain extent after, its decrease in efficiency.In addition neither the number of turns from engineering viewpoint The more the better.Homogeneity for synthetic of radio frequency, it doesn't matter with the number of turns, when its Coordinate system definition is during as Fig. 1, spacing between the homogeneity of X-direction and two coils has relation, coil 6 spacing homogeneity far away is better, the homogeneity of Y direction can be adjusted in the size of Y-direction by adjusting coil 6, and the homogeneity of Z-direction can regulate in the size of Z direction by adjusting coil 6.
Claims (8)
1. a coil device that is applied to magnetic resonance imaging, comprise power divider, upper magnet and lower magnet, it is characterized in that: also comprise the radio-frequency coil unit of two longitudinal arrangements, upper radio shielding layer and lower radio shielding layer, described radio-frequency coil unit is connected with described power divider; Described upper radio shielding layer and described lower radio shielding layer lay respectively at the both sides up and down of described radio-frequency coil unit, and the plane of described upper radio shielding layer and described lower radio shielding layer is parallel to each other, and is arranged on respectively on upper magnet and lower magnet; Symmetric shape centered by described radio-frequency coil unit, upper radio shielding layer and lower radio shielding layer.
2. a kind of coil device that is applied to magnetic resonance imaging as claimed in claim 1, is characterized in that: the geometric center of described two radio-frequency coil unit with the main field center of described upper magnet and lower magnet point-blank.
3. a kind of coil device that is applied to magnetic resonance imaging as claimed in claim 1, it is characterized in that: upper gradient dish and descending stair scale are embedded into respectively in described upper magnet and lower magnet, the upper surface of the lower surface of described upper gradient dish and described descending stair scale is highly consistent with upper magnet and lower magnet periphery respectively, and described upper radio shielding layer directly contacts with described descending stair scale with described upper gradient dish respectively with described lower radio shielding layer.
4. a kind of coil device that is applied to magnetic resonance imaging as claimed in claim 1, it is characterized in that: described upper radio shielding layer and lower radio shielding layer have measure-alike breach four corner positions, described breach is 200～400mm in directions X range of size, and the range of size of Y-direction is 150～300mm.
5. a kind of coil device that is applied to magnetic resonance imaging as described in claim 1 to 4 any one, it is characterized in that: the material of described upper radio shielding layer and lower radio shielding layer adopts double face copper or copper coin, its thickness range is 0.1～2mm, and its planar dimension is to be no more than the diameter of described upper magnet and lower magnet.
6. a kind of coil device that is applied to magnetic resonance imaging as claimed in claim 1, is characterized in that: the structure of described radio-frequency coil unit comprises: shell, coil and metal forming; The described shell of nonmetallic materials be shaped as Central Symmetry shape, adapt with the shape of described coil; In the middle of the frame of described shell, be provided with inside groove, the described coil that outside is wound with described metal forming is arranged in described inside groove.
7. a kind of coil device that is applied to magnetic resonance imaging as claimed in claim 6, it is characterized in that: the number of turns of described metal forming is 1～8 circle, described coil is the coil of 1～8 circle that coiling direction is identical, between adjacent windings, with electric capacity, is coupled, and every turn coil is in series with electric capacity.
8. a kind of coil device that is applied to magnetic resonance imaging as claimed in claim 6, is characterized in that: described metal forming adopts Copper Foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310733339.8A CN103744041B (en) | 2013-12-27 | 2013-12-27 | A kind of coil device being applied to nuclear magnetic resonance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310733339.8A CN103744041B (en) | 2013-12-27 | 2013-12-27 | A kind of coil device being applied to nuclear magnetic resonance |
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| CN103744041A true CN103744041A (en) | 2014-04-23 |
| CN103744041B CN103744041B (en) | 2017-01-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155622B (en) * | 2014-08-26 | 2017-10-03 | 国家电网公司 | A kind of planar radio frequency coils for nuclear magnetic resonance |
| CN107621615A (en) * | 2017-09-28 | 2018-01-23 | 深圳鑫德瑞电气科技有限公司 | Embedded gradient and radio frequency integrated coil and the magnetic resonance equipment with the integrated coil |
| CN109696642A (en) * | 2018-12-29 | 2019-04-30 | 佛山瑞加图医疗科技有限公司 | Coil device and magnetic resonance imaging system |
| CN112394308A (en) * | 2019-08-15 | 2021-02-23 | 西门子(深圳)磁共振有限公司 | Transmitting radio frequency coil unit and magnetic resonance system |
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| CN2221939Y (en) * | 1995-06-05 | 1996-03-13 | 深圳安科高技术有限公司 | Radio-frequency coil device for magnetic resonance imaging system |
| CN201617828U (en) * | 2010-04-22 | 2010-11-03 | 杜健军 | Radio-frequency coil device in magnetic resonance imaging system |
| CN102338862A (en) * | 2010-06-01 | 2012-02-01 | 高质电动有限公司 | RF coil assembly, protection method thereof, and magnetic resonance imaging system |
| CN102652027A (en) * | 2009-12-10 | 2012-08-29 | 皇家飞利浦电子股份有限公司 | Magnetic resonance -compatible electrical device with radio frequency shielding or an enclosure |
| US20130285659A1 (en) * | 2012-04-20 | 2013-10-31 | Sung-Min Sohn | System and Method for Control of RF Circuits for Use With an MRI System |
| CN103399284A (en) * | 2013-08-07 | 2013-11-20 | 深圳市特深电气有限公司 | Magnetic resonance composite coil and magnetic resonance imaging system |
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2013
- 2013-12-27 CN CN201310733339.8A patent/CN103744041B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2221939Y (en) * | 1995-06-05 | 1996-03-13 | 深圳安科高技术有限公司 | Radio-frequency coil device for magnetic resonance imaging system |
| CN102652027A (en) * | 2009-12-10 | 2012-08-29 | 皇家飞利浦电子股份有限公司 | Magnetic resonance -compatible electrical device with radio frequency shielding or an enclosure |
| CN201617828U (en) * | 2010-04-22 | 2010-11-03 | 杜健军 | Radio-frequency coil device in magnetic resonance imaging system |
| CN102338862A (en) * | 2010-06-01 | 2012-02-01 | 高质电动有限公司 | RF coil assembly, protection method thereof, and magnetic resonance imaging system |
| US20130285659A1 (en) * | 2012-04-20 | 2013-10-31 | Sung-Min Sohn | System and Method for Control of RF Circuits for Use With an MRI System |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155622B (en) * | 2014-08-26 | 2017-10-03 | 国家电网公司 | A kind of planar radio frequency coils for nuclear magnetic resonance |
| CN107621615A (en) * | 2017-09-28 | 2018-01-23 | 深圳鑫德瑞电气科技有限公司 | Embedded gradient and radio frequency integrated coil and the magnetic resonance equipment with the integrated coil |
| CN107621615B (en) * | 2017-09-28 | 2023-09-15 | 平康(深圳)医疗设备科技有限公司 | Embedded gradient and radio frequency integrated coil and magnetic resonance equipment with same |
| CN109696642A (en) * | 2018-12-29 | 2019-04-30 | 佛山瑞加图医疗科技有限公司 | Coil device and magnetic resonance imaging system |
| CN112394308A (en) * | 2019-08-15 | 2021-02-23 | 西门子(深圳)磁共振有限公司 | Transmitting radio frequency coil unit and magnetic resonance system |
| CN112394308B (en) * | 2019-08-15 | 2024-01-30 | 西门子(深圳)磁共振有限公司 | Transmitting radio frequency coil unit and magnetic resonance system |
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| CN103744041B (en) | 2017-01-04 |
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