CN101856229B - Radio-frequency coil device in magnetic resonance imaging system - Google Patents
Radio-frequency coil device in magnetic resonance imaging system Download PDFInfo
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- CN101856229B CN101856229B CN 201010157933 CN201010157933A CN101856229B CN 101856229 B CN101856229 B CN 101856229B CN 201010157933 CN201010157933 CN 201010157933 CN 201010157933 A CN201010157933 A CN 201010157933A CN 101856229 B CN101856229 B CN 101856229B
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 32
- 239000002184 metal Substances 0.000 claims description 39
- 229910052751 metal Inorganic materials 0.000 claims description 39
- 239000000463 material Substances 0.000 claims description 18
- 239000011888 foil Substances 0.000 claims description 12
- 230000010287 polarization Effects 0.000 claims description 6
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 26
- 230000005672 electromagnetic field Effects 0.000 description 6
- 238000003384 imaging method Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000010992 reflux Methods 0.000 description 1
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Abstract
The invention relates to a radio-frequency coil device in a magnetic resonance imaging system, which comprises a power distributor or power combiner and a radio-frequency coil unit connected with the power distributor or power combiner, wherein the radio-frequency coil unit comprises two layers of parallel conductive planes respectively electrically connected with corresponding ends of a capacitor (13) and resonance cavities inside the conductive planes. A radio-frequency current loop of a coil is combined with a shielding layer, and an eddy current removing structure is adopted, therefore, the radio-frequency coil device in the magnetic resonance imaging system has simple structure and good channel coupling, realizes the orthogonal or circularly polarized radio-frequency coil, and improves the efficiency and the quality of the radio-frequency coil.
Description
Technical field
The present invention relates to a kind of radio-frequency coil, the coil device in especially a kind of magnetic resonance imaging system.
Background technology
In the modern medical service technology, MR imaging apparatus is a kind of armarium commonly used, its principle is to utilize the magnetic resonance phenomenon to detect tested human body or sample to wish the Density Distribution of the part that checks, relaxation time distribution etc., and is demonstrated cross-section image or the 3-D view of checked human body or sample part with pictorial form by the data that record.In such magnetic resonance equipment, be used for applying high-frequency rotating magnetic field or accepting human body or electromagnetic coil device that sample produces to checked human body or sample, vertical bar lead-type and the different designs such as saddle-shape and distortion thereof are arranged, and principle is by the electric current that flows through electric conductor and generates an electromagnetic field to realize the purpose of excited sample molecule or accept the electromagnetic wave that sample molecule sends by the resonance coil that electric conductor forms.In general, screen layer is to be separable independently two parts with coil.
Chinese invention patent " a kind of coil device and discharge method that is applied to magnetic resonance imaging system ", publication number CN1408318, a kind of radio-frequency coil of vertical bar lead-type is disclosed, another Chinese invention patent " the heterocoelous radio-frequency coil of RF coil for magnetic resonance imaging and MR imaging apparatus ", publication number CN1408318, disclosing a kind of heterocoelous radio-frequency coil, all is to adopt to obtain needed electromagnetic field by electric current on plain conductor.
These existing schemes because of structure too the coupling between complexity or the passage can't solve etc. former thereby be inconvenient to do the radio-frequency coil that is orthogonal, be also referred to as the circular polarisation radio-frequency coil, the radio-frequency coil that common like this these schemes are made is non-orthogonal or is called the radio-frequency coil of linear polarization.By the nuclear magnetic resonance theory as can be known, the efficient of circular polarisation radio-frequency coil is the twice of linear polarization radio-frequency coil, so the efficient of these schemes is not high, and radio-frequency (RF) magnetic field is even not, and quality factor are low.
Summary of the invention
The technical issues that need to address of the present invention are, how the coil device in a kind of magnetic resonance imaging system is provided, and simple in structure, passage is coupled, thereby can provide efficient higher, more uniform magnetic field.
Technical problem of the present invention solves like this: make up the coil device in a kind of magnetic resonance imaging system, comprise a power divider or a power combiner, also comprise the radio-frequency coil unit that is connected with described power divider or a power combiner, described radio-frequency coil unit comprises respectively and the electric capacity two layers of parallel electrically conductive plane and the internal resonance chamber thereof that are electrically connected of corresponding end separately.
According to the coil device in the magnetic resonance imaging system provided by the invention; described radio-frequency coil unit also comprise between described two layers of parallel electrically conductive plane or outside one or more layers parallel electrically conductive plane; need to cut groove owing to consist of two layers of parallel electrically conductive plane of resonator cavity in order to reduce eddy-current loss; thereby shield effectiveness reduces; at this moment the extra parallel electrically conductive plane that increases can strengthen shield effectiveness, usually can adopt two-side metal foil sheet material.
According to the coil device in the magnetic resonance imaging system provided by the invention, described parallel electrically conductive plane is circle or octagon and above centrosymmetry regular polygon, also can be other centrosymmetry shapes, circular.
According to the coil device in the magnetic resonance imaging system provided by the invention, described parallel electrically conductive plane has stria, and effect is to cut off vortex induced current loop, thereby reduces eddy-current loss.
According to the coil device in the magnetic resonance imaging system provided by the invention, described stria becomes radial, centrosymmetry.
According to the coil device in the magnetic resonance imaging system provided by the invention, if described parallel electrically conductive plane is the two sides that is positioned at two-side metal foil sheet material, the stria of its front and back staggers mutually, and its effect is to strengthen shield effectiveness, prevents the radio-frequency (RF) energy leakage.
According to the coil device in the magnetic resonance imaging system provided by the invention, described two-side metal foil sheet material includes, but are not limited to adopt epocel cloth double-side copper-applying plate.
According to the coil device in the magnetic resonance imaging system provided by the invention, described stria both sides flying capcitor.
According to the coil device in the magnetic resonance imaging system provided by the invention, circular polarisation radio-frequency coil unit when the linear polarization radio-frequency coil unit when described radio-frequency coil unit is set as single-point feedback and 2 and 2 above feeds, when 2 and 2 above feeds, the phase place of distributing point differs the integral multiples of 90 degree usually.
According to the coil device in the magnetic resonance imaging system provided by the invention, the centre single-point grounding on described parallel electrically conductive plane.
According to the coil device in the magnetic resonance imaging system provided by the invention, screen layer and the galvanic circle of described radio-frequency coil unit unite two into one, for self-shileding designs.
Coil device in the magnetic resonance imaging system provided by the invention, radio frequency current circuit and the screen layer of coil are integrally combined, further adopt and remove vortex structure, compared with prior art, has following advantage: the 1. similar resonator cavity of the shape of radio-frequency coil, shape is symmetrical, conveniently is fixed in the magnet.2. the bottom of resonator cavity just can be used as screen layer, plays good shielding action, does not need extra screen layer, is the self-shileding radio-frequency coil, and effect is better, provide cost savings simultaneously.3. coil adopts goes vortex design, can effectively reduce eddy-current loss, raises the efficiency.4. the symmetric design of scheme itself, so that the coupling energy automotive resistance between many distributing points is most of, remaining fraction, method that can be easy is removed.5. the design of integrated self-shileding loop structure and with the combining of resonator cavity radio frequency coil designs, and the simple structural design of removing efficiently coupling minimizing eddy-current loss.This invention especially is applied to the transmitting coil in the permanent magnetic resonance system, can produce Uniform Electromagnetic Field near the zone transmitting coil, and convenient quadrature or the circular polarisation of realizing, efficient is higher and save the space, and quality factor are high.
Description of drawings
Further the present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the radio-frequency coil cellular construction sketch map of the coil device in the magnetic resonance imaging system of the present invention;
Fig. 2 is metal forming sketch map in the radio-frequency coil shown in Figure 1 unit;
Fig. 3 is the coil device specific embodiment structural representation in the magnetic resonance imaging system of the present invention;
Fig. 4 is the structural representation of feed cable.
The specific embodiment
At first, inventive concept is described:
The present invention program is a kind of novel radio-frequency coil according to similar resonant cavity principle design, from common resonator cavity mainly utilize be the electromagnetic field of intracavity different what be that this design utilizes is that the outer electromagnetic field of resonator cavity is launched or received RF signal.The design of this programme and common radio-frequency coil is different is that radio frequency current circuit and screen layer with coil is integrally combined, and adopts the structural design of removing eddy current.It is higher that this scheme has emission effciency, and loss is less, the more uniform important feature of electromagnetic field.Because the symmetric properties of this scheme itself so that be easy to make multichannel, quadrature or the phased array radio frequency coil, and the uncoupling between the passage is very easy to realization.Common radio-frequency coil scheme all is non-orthogonal or is called linear polarization, can be very complicated on the loop construction that is orthogonal or be called circular polarisation as doing, be difficult for realizing, and the coupling meeting between the coil is very large.Being designed with of this sample plan is beneficial to the radio-frequency coil realization quadrature or that claim circular polarisation.
Secondly, concrete measure of the present invention is described:
1. a coil device that is applied to magnetic resonance imaging system comprises a power divider or a power combiner,
2. the radio-frequency coil of the similar resonator cavity that forms of plural layer metal forming and insulated non-metal material.
3. the shape of coil is symmetrical, can adapt to any magnet shape, conveniently is fixed in the magnet.
4. the shape of the metal forming of coil unit and insulated non-metal bracing frame is symmetrical, is circle or even number regular polygon.
5. orthogonal circular polarizations radio-frequency coil, the integral multiple of phase phase difference 90 degree of distributing point
6. the corresponding rule that determines by needed field strength distribution of electric capacity is arranged between the double layer of metal paper tinsel and forms resonator cavity.
The numerical value of electric capacity be adjusted to so that resonator cavity resonance on desired frequency
8. have radial stria on the metal forming sheet material, arbitrarily angle, and the stria on the two sides of same metal forming sheet material does not overlap, and keeps simultaneously good shield effectiveness in minimizing eddy-current loss.
9. the stria on metal forming sheet material two sides does not cut off metal forming fully, and separated polylith metal forming still links together at middle section, and ground connection, prevents from gathering on the metal forming electric charge, produces electric discharge phenomena.
10. the wherein one side of metal forming sheet material is connected to the both sides of stria with a series of electric capacity, keeps the radio-frequency current path, and is connected to the equivalent layer of another metal forming sheet material, formation resonator cavity by electric capacity.
11. resonator cavity can be used as the Isolated Shield layer near the metal foil surfaces of magnet.
Further, illustrate that the present invention optimizes specific implementation:
As shown in Figure 1; the primary structure of the radio-frequency coil unit of this optimization is two two-side metal foil sheet materials up and down and the passive nonmetallic materials support 14 that is clipped in the middle; this two-side metal foil sheet material can select epocel cloth double face copper metal forming sheet material to cut into symmetrical shape usually; for example circle or regular polygon; be connected between two metal forming sheet materials with electric capacity, and be distributed in according to certain rules the periphery of two metal forming sheet materials.The resonant frequency of the resonator cavity that is comprised of metal forming 12 and electric capacity 13 can be adjusted to the needed resonant frequency of coil working, changes the capability value of electric capacity and the frequency that the distance between the metal forming sheet material can change resonance.
Two-side metal foil sheet material is comprised of two sides metal forming 12 and the insulated non-metal material 11 that is clipped in the middle, and usually can select epocel cloth double-side copper-applying plate, and wherein one side is connected to another metal forming by electric capacity 13 elements and is used for forming resonator cavity; Another side is used for as screen layer.
Because MR imaging apparatus all has a gradient coil usually in the bottom of radio-frequency coil.The operating frequency of gradient coil is lower, and usually below 10KHz, but power is larger.Can produce faradic current in the metal around during gradient coil operation, thereby produce eddy-current loss.Therefore in order to reduce the eddy-current loss that produces in the large-area metal foil layer in this programme, as shown in Figure 2, this scheme should be selected satisfactory thin as far as possible metal forming; And the metal foil layer on metal forming sheet material has stria 21,23, and purpose is to cut off faradic circulation path, reduces eddy-current loss.Be connected to simultaneously the both sides of stria with electric capacity 22, keep resonant radio frequency current reflux path but the faradic current of low frequency is still cut off.One of as an example such as figure,,, the stria of opening on the metal forming adopts radial, front stria 21 and back side stria 23 stagger mutually, avoid overlapping or intersecting, and utilize the Capacitance Coupled between the metal foil layer to form a complete radio shielding layer.For avoiding accumulate static charge on the metal forming, flashing electric discharge phenomena in the MR imaging apparatus work process, all strias do not connect whole metal foil layer, but all separated metal formings are remained connected together in central spot, and be connected to screen layer by lead-in wire and be connected to ground from the central spot of metal forming, this scheme that all metal forming single-points are linked together can reduce eddy-current loss effectively.
The radio-frequency coil unit is connected on receiver or the transmitter by radio-frequency cable 41 as shown in Figure 4, realizes that emitting radio frequency signal produces the needed radio-frequency (RF) magnetic field of nuclear magnetic resonance or accepts the function of radiofrequency signal.In MR imaging apparatus, the common work of also can joining together more than two is to produce radio-frequency (RF) magnetic field or to accept radiofrequency signal.It below is a kind of application example, as shown in Figure 3, two radio-frequency coil unit are relatively put up and down abreast, are connected to a power divider or power combiner by radio-frequency cable, and then are connected to radio frequency transmitter signal or receiver by this power divider or synthesizer.Differ the integral multiple of 90 degree between the junction point of radio-frequency cable and coil unit.Distributing point power divider or power combiner and coupled radio-frequency cable are realized certain phase contrast transmitting radio frequency signal, so that the radiofrequency signal of emission or acceptance is circular polarisation.
At last, in those of ordinary skills understood scope, in claim scope of the present invention, various variations all belonged to protection scope of the present invention.
Claims (9)
1. the coil device in the magnetic resonance imaging system, comprise a power divider or a power combiner, it is characterized in that, also comprise the radio-frequency coil unit that is connected with described power divider or a power combiner, each radio-frequency coil unit comprises respectively and electric capacity (13) the two layers of parallel electrically conductive plane and the internal resonance chamber thereof that are electrically connected of corresponding end separately that radio frequency current circuit and the screen layer of described radio-frequency coil unit unite two into one.
2. the coil device in the described magnetic resonance imaging system according to claim 1 is characterized in that, described radio-frequency coil unit also comprise between described two layers of parallel electrically conductive plane or outside one or more layers parallel electrically conductive plane.
3. the coil device in the described magnetic resonance imaging system according to claim 1 is characterized in that described parallel electrically conductive plane is circle or octagon and above centrosymmetry regular polygon.
4. the coil device in the described magnetic resonance imaging system according to claim 1 is characterized in that described parallel electrically conductive plane has stria (21,23).
5. the coil device in the described magnetic resonance imaging system according to claim 4 is characterized in that it is radial that described stria (21,23) becomes.
6. the coil device in the described magnetic resonance imaging system according to claim 4 is characterized in that described parallel electrically conductive plane is the two sides that is positioned at two-side metal foil sheet material, and the stria of its front and back (21,23) staggers mutually.
7. the coil device in the described magnetic resonance imaging system according to claim 4 is characterized in that described stria (21,23) both sides flying capcitor.
8. the coil device in the described magnetic resonance imaging system according to claim 1 is characterized in that described radio-frequency coil unit is the linear polarization radio-frequency coil unit of single-point feedback and the circular polarisation radio-frequency coil unit of 2 and 2 above feeds.
9. the coil device in the described magnetic resonance imaging system according to claim 1 and 2 is characterized in that the centre single-point grounding on described parallel electrically conductive plane.
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| CN 201010157933 CN101856229B (en) | 2010-04-22 | 2010-04-22 | Radio-frequency coil device in magnetic resonance imaging system |
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| CN 201010157933 CN101856229B (en) | 2010-04-22 | 2010-04-22 | Radio-frequency coil device in magnetic resonance imaging system |
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| CN101856229B true CN101856229B (en) | 2013-04-24 |
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| CN107092002A (en) * | 2012-11-27 | 2017-08-25 | 朱宇东 | A kind of method of change in time and space using the real-time performance electromagnetic field with electric current carrying pathway |
| CN106980097B (en) * | 2017-05-19 | 2023-10-10 | 深圳市特深电气有限公司 | Birdcage coil for magnetic resonance imaging system and tuning method thereof |
| US11564575B2 (en) | 2018-01-17 | 2023-01-31 | Shanghai United Imaging Healthcare Co., Ltd. | Magnetic resonance-positron emission tomography imaging apparatus |
| CN108261200B (en) * | 2018-01-17 | 2022-07-26 | 上海联影医疗科技股份有限公司 | MR-PET scanning device |
| CN108761365B (en) * | 2018-04-11 | 2021-02-19 | 上海联影医疗科技股份有限公司 | Shielding shell, manufacturing method of shielding shell, PET detector and system |
| CN108614226A (en) * | 2018-04-25 | 2018-10-02 | 重庆师范大学 | It can inhibit the nuclear magnetic resonance multi-planar radio frequency cellular construction of eddy current effect |
| 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 |
| CN112540332B (en) * | 2020-12-03 | 2023-11-14 | 深圳航天科技创新研究院 | Magnetic resonance radio frequency shielding structure and design method thereof |
| CN113109748A (en) * | 2021-05-08 | 2021-07-13 | 苏州众志医疗科技有限公司 | Radio frequency device for magnetic resonance imaging and magnetic resonance imaging system |
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| CN1306217A (en) * | 1999-12-06 | 2001-08-01 | 通用电气公司 | Radio frequency coil for opening magnetic resonance imaging system |
| DE10056807A1 (en) * | 2000-11-16 | 2002-05-23 | Philips Corp Intellectual Pty | HF planar resonator for transmitting/receiving circularly polarized electromagnetic waves has conductor structures stretching from a central area in radial directions and a conductor loop around this area for a return current. |
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| CN1508560A (en) * | 2002-12-16 | 2004-06-30 | 中国科学院电工研究所 | C-type open MRI panel radio-frequency coil |
| CN101190127A (en) * | 2006-11-29 | 2008-06-04 | 北京万东医疗装备股份有限公司 | Radio frequency coil for flat plate structure |
| CN101568849A (en) * | 2006-12-22 | 2009-10-28 | 皇家飞利浦电子股份有限公司 | RF coil for use in an mr imaging system |
| CN201617828U (en) * | 2010-04-22 | 2010-11-03 | 杜健军 | Radio-frequency coil device in magnetic resonance imaging system |
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2010
- 2010-04-22 CN CN 201010157933 patent/CN101856229B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2151791A (en) * | 1983-12-23 | 1985-07-24 | Gen Electric | RF Field coils for NMR apparatus |
| CN1306217A (en) * | 1999-12-06 | 2001-08-01 | 通用电气公司 | Radio frequency coil for opening magnetic resonance imaging system |
| DE10056807A1 (en) * | 2000-11-16 | 2002-05-23 | Philips Corp Intellectual Pty | HF planar resonator for transmitting/receiving circularly polarized electromagnetic waves has conductor structures stretching from a central area in radial directions and a conductor loop around this area for a return current. |
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| CN201617828U (en) * | 2010-04-22 | 2010-11-03 | 杜健军 | Radio-frequency coil device in magnetic resonance imaging system |
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