CN104783795A - Magnetic resonance radio frequency receiving coil with coil unit isolating function - Google Patents
Magnetic resonance radio frequency receiving coil with coil unit isolating function Download PDFInfo
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- CN104783795A CN104783795A CN201410027946.7A CN201410027946A CN104783795A CN 104783795 A CN104783795 A CN 104783795A CN 201410027946 A CN201410027946 A CN 201410027946A CN 104783795 A CN104783795 A CN 104783795A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
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Abstract
The invention discloses a magnetic resonance radio frequency receiving coil with a coil unit isolating function. The magnetic resonance radio frequency receiving coil comprises at least three coil units. The coil units include at least one coupling coil assembly composed of two coil units. A public isolation adjusting circuit is arranged between the two coil units of the coupling coil assembly and connected into the two coil units of the coupling coil assembly in series. The isolation adjusting circuit comprises a capacitor and a first electric inductor which are connected in series. The first electric inductor is coupled with an electric inductor of at least one coil unit except the coupling coil assembly in a mutual inductance mode. The magnetic resonance radio frequency receiving coil has the advantages that the number of the applied electric inductors is small, the structure is simple and compact, components and parts are arranged conveniently and fast, the signal to noise ratio of the coil is low, and the coil is not prone to oscillation and is convenient and easy to design and use.
Description
Technical field
The present invention relates to magnetic resonance imaging arts, be specifically related to a kind of magnetic resonance radio frequency receiving coil with coil unit isolation features.
Background technology
Nuclear magnetic resonance (MRI) is a very important ingredient in modern medicine iconography, has Noninvasive, without features such as ionizing radiation.RF receiving coil is a vitals of magnetic resonance system, and the performance of magnetic resonance radio frequency receiving coil directly decides the image quality of magnetic resonance system, is therefore called as " eyes " of magnetic resonance system.
In order to obtain better picture quality, the port number of magnetic resonance radio frequency receiving coil gets more and more.In this case, eliminate the coupling between each passage, realize good isolation, just become ever more important.For this reason, there has been proposed the method for isolation between multiple increase coil unit, comprise overlap method, share the method for electric capacity, introduce the method for inductive bank between two coils, use the method etc. of low input impedance preamplifier.In the structure of n coil unit, if all need between any two to regulate isolation, then need C
n 2plant regulating circuit.If the simple method using adjustment of inductance isolation, then need 2C
n 2individual inductance.Namely each coil unit to introduce 2C
n 2/ n inductance.When table 1 illustrates different coil unit quantity, the required inductance number introduced in theory.
Table 1: the inductance number table of required introducing in theory when different coil unit quantity.
| Coil unit number (individual) | Total inductance number (individual) | Inductance number (individual) in each coil unit |
| 3 | 6 | 2 |
| 4 | 12 | 3 |
| 6 | 30 | 5 |
| 8 | 56 | 7 |
The introducing of inductance will reduce the signal to noise ratio of coil, and magnetic resonance field intensity is higher, and this effect can be more obvious.The inductance quantity introduced is more, and it is more that signal to noise ratio also just reduces.In addition, too many inductance also has suitable difficulty on space arrangement.Certainly, in a practical situation, do not need the isolation between every two coil units all to regulate, and multiple control method is combined often, introduces tens of even up to a hundred inductance without the need to---also impossible---.But in general, the isolation between the coil unit of next-door neighbour needs to regulate, even if in this case, also needs to introduce multiple inductance.
The shown in Figure 1 magnetic resonance radio frequency receiving coil be made up of three coil units (#A, #B, #C), its method adopting existing inductance to increase isolation introduces inductance.Wherein, inductance L 1 and inductance L 2 are for increasing the isolation between coil unit #A and coil unit #B, inductance L 3 and inductance L 4 are for increasing the isolation between coil unit #A and coil unit #C, and inductance L 5 and inductance L 6 are for increasing the isolation between coil unit #B and coil unit #C.
The shown in Figure 2 magnetic resonance radio frequency receiving coil be made up of three coil units (#A, #B, #C, #D), its method adopting existing inductance to increase isolation introduces inductance.Wherein, inductance L 7 and inductance L 8 are for increasing the isolation between coil unit #A and coil unit #B, inductance L 9 and inductance L 10 are for increasing the isolation between coil unit #A and coil unit #C, inductance L 11 and inductance L 12 are for increasing the isolation between coil unit #A and coil unit #D, inductance L 13 and inductance L 14 are for increasing the isolation between coil unit #B and coil unit #C, inductance L 15 and inductance L 16 are for increasing the isolation between coil unit #B and coil unit #D, inductance L 17 and inductance L 18 are for increasing the isolation between coil unit #C and coil unit #D.Visible, when coil unit is many, regulate if reduce the isolation using inductance number to realize between coil unit, become a key technical problem urgently to be resolved hurrily.
Summary of the invention
The technical problem to be solved in the present invention is to provide and a kind ofly uses that inductance quantity is few, simple and compact for structure, components and parts arrangement is convenient, coil signal to noise ratio is low, coil not easily vibrates, design the magnetic resonance radio frequency receiving coil with coil unit isolation features simple and easy to use.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of magnetic resonance radio frequency receiving coil with coil unit isolation features, comprise at least three coil units, described at least three coil units comprise at least one coupling coil group be made up of two coil units, public isolation regulating circuit is provided with between two coil units in described coupling coil group, described isolation regulating circuit is connected in two coil units of access coupling coil group simultaneously, described isolation regulating circuit comprises the electric capacity and the first inductance that are connected in series, inductance Mutual Inductance Coupling at least one coil unit outside described first inductance and described coupling coil group.
The magnetic resonance radio frequency receiving coil that the present invention has coil unit isolation features has following advantage:
1, the present invention is by sharing first inductance by between the coil unit of two in coupling coil group, two coil units that the first inductance shared is equivalent in coupling coil group respectively have an inductance, and a coil unit that therefore can be used for outside realization and coupling coil group realizes isolating; Simultaneously, due to the isolation regulating circuit of the electric capacity that is connected in series and the first inductance composition, the isolation between two coil units in coupling coil group can be realized, thus the isolation that can to realize easily in each coil unit between any two, therefore the present embodiment both can realize the isolation between coil unit, the circuit structure of coil unit can be simplified again, reduce the quantity increasing isolation inductance used, there is the advantage using inductance quantity few, simple and compact for structure, especially, when the number of coil unit is more, this advantage is more remarkable.
2, the present invention is by the electric capacity in lead-in coil unit and the first inductance, coil signal to noise ratio is improved, the arrangement of components and parts, reduce the aspects such as coil vibration probability all helpful, can offer convenience for the design of magnetic resonance radio frequency receiving coil, have that components and parts arrangement is convenient, coil signal to noise ratio is low, coil not easily vibrates, design advantage simple and easy to use.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of prior art three-winding unit magnetic resonance radio frequency receiving coil.
Fig. 2 is the electrical block diagram of prior art four coil unit magnetic resonance radio frequency receiving coil.
Fig. 3 is the electrical block diagram of the embodiment of the present invention one.
Fig. 4 is the electrical block diagram of isolation regulating circuit in the embodiment of the present invention one.
Fig. 5 is the electrical block diagram of the embodiment of the present invention two.
Marginal data: 1, coil unit; 2, coupling coil group; 21, isolation regulating circuit; 211, electric capacity; 212, the first inductance.
Detailed description of the invention
embodiment one:
As shown in Figure 3 and Figure 4, the magnetic resonance radio frequency receiving coil that the present embodiment has coil unit isolation features comprises three coil unit 1(coil unit 1#1 ~ coil unit 1#3), three coil unit 1(coil unit 1#1 ~ coil unit 1#3) comprise one by two coil unit 1(coil unit 1#1 ~ coil unit 1#2) the coupling coil group 2 that forms, two coil unit 1(coil unit 1#1 ~ coil unit 1#2 in coupling coil group 2) between be provided with public isolation regulating circuit 21, isolation regulating circuit 21 is connected simultaneously and is accessed two coil unit 1(coil unit 1#1 ~ coil unit 1#2 of coupling coil group 2) in, isolation regulating circuit 21 comprises the electric capacity 211 and the first inductance 212 that are connected in series, first inductance 212 and a coil unit 1(coil unit 1#3 outside coupling coil group 2) on inductance Mutual Inductance Coupling.
The present embodiment is by sharing first inductance 212 by between the coil unit of two in coupling coil group 21, two coil units 1 that the first inductance 212 shared is equivalent in coupling coil group 2 respectively have an inductance, and a coil unit 1 that therefore can be used for outside realization and coupling coil group 2 realizes isolating; Meanwhile, due to the isolation regulating circuit 21 of the electric capacity 211 that is connected in series and the first inductance 212 composition, the isolation between two coil units 1 in coupling coil group 21 can be realized, thus isolation between any two can be realized in each coil unit 1 easily.Known see Fig. 1, the isolation that the magnetic resonance radio frequency receiving coil that prior art comprises three coil units 1 needs 6 inductance could realize between all coils unit 1 altogether; Known see Fig. 3, the isolation that the present embodiment needs altogether only two the first inductance 212 and electric capacity 211 can realize between all coils unit 1.The present embodiment both can realize the isolation between coil unit 1, the circuit structure of coil unit can be simplified again, reduce the quantity increasing isolation inductance used, there is the advantage using inductance quantity few, simple and compact for structure, especially, when the number of coil unit is more, this advantage is more remarkable.In addition, the present embodiment is by the electric capacity 211 in lead-in coil unit 1 and the first inductance 212, coil signal to noise ratio is improved, the arrangement of components and parts, reduce the aspects such as coil vibration probability all helpful, can offer convenience for the design of magnetic resonance radio frequency receiving coil, have that components and parts arrangement is convenient, coil signal to noise ratio is low, coil not easily vibrates, design advantage simple and easy to use.
Theoretically, the mutual inductance only between coil unit 1#1, coil unit 1#3 and the mutual inductance between coil unit 1#2, coil unit 1#3 basically identical time, the first shared inductance 212 just can realize the optimum of two groups of isolations simultaneously.In the middle of reality, can by suitable adjustment three coil unit 1(coil unit 1#1 ~ coil unit 1#3) between mutual alignment, obtain the condition that between coil unit 1#1, coil unit 1#3 and coil unit 1#2, coil unit 1#3, mutual inductance is basically identical.After electric capacity 211 and the first inductance 212 are connected in series, by adjusting the capacitance of electric capacity 211, the optimal isolation degree between coil unit 1#1, coil unit 1#2 can be realized.
embodiment two:
As shown in Figure 5, the magnetic resonance radio frequency receiving coil that the present embodiment has coil unit isolation features comprises four coil unit 1(coil unit 1#1 ~ coil unit 1#4), four coil unit 1(coil unit 1#1 ~ coil unit 1#4) comprise two coupling coil groups 2 be made up of two coil units 1, namely coil unit 1#1 and coil unit 1#2 forms coupling coil group 2#1, and coil unit #3 and coil unit #4 forms coupling coil group 2#2.
In the present embodiment, two coil unit 1(coil unit 1#1 and coil unit 1#2 in coupling coil group 2#1) between be provided with public isolation regulating circuit 21#1, isolation regulating circuit 21#1 connects simultaneously and accesses two coil unit 1(coil unit 1#1 and coil unit 1#2 of coupling coil group 2#1) in, isolation regulating circuit 21#1 comprises the electric capacity 211 and the first inductance 212 that are connected in series, first inductance 212 and two coil unit 1(coil unit 1#3 and coil unit 1#4 outside coupling coil group 2#1 of isolation regulating circuit 21#1) on inductance Mutual Inductance Coupling, two coil unit 1(coil unit 1#3 and coil unit 1#4 in coupling coil group 2#2) between be provided with public isolation regulating circuit 21#2, isolation regulating circuit 21#2 connects simultaneously and accesses two coil unit 1(coil unit 1#3 and coil unit 1#4 of coupling coil group 2#2) in, isolation regulating circuit 21#2 comprises the electric capacity 211 and the first inductance 212 that are connected in series, the first inductance 212 and two coil unit 1(coil unit 1#1 and coil unit 1#2 outside coupling coil group 2#2 of isolation regulating circuit 21#2) on inductance Mutual Inductance Coupling.
The present embodiment is by by the coil unit 1(coil unit 1#1 and coil unit 1#2 of two in coupling coil group 2#1) between share first inductance 212, the first inductance 212 shared in coupling coil group 2#1 is equivalent to two coil unit 1(coil unit 1#1 and coil unit 1#2 in coupling coil group 2#1) respectively there is an inductance, therefore can be used for realizing and two coil unit 1(coil unit 1#3 and coil unit 1#4 outside coupling coil group 2#1) realize isolating; In like manner, by by the coil unit 1(coil unit 1#3 and coil unit 1#4 of two in coupling coil group 2#2) between share first inductance 212, the first inductance 212 shared in coupling coil group 2#2 is equivalent to two coil unit 1(coil unit 1#3 and coil unit 1#4 in coupling coil group 2#2) respectively there is an inductance, therefore can be used for realizing and two coil unit 1(coil unit 1#1 and coil unit 1#2 outside coupling coil group 2#2) realize isolating, thus isolation between any two can be realized in each coil unit 1 easily.Known see Fig. 2, the isolation that the magnetic resonance radio frequency receiving coil that prior art comprises four coil units 1 needs 12 inductance could realize between all coils unit 1 altogether; Known see Fig. 4, the isolation that the present embodiment needs altogether only two the first inductance 212 and two electric capacity 211 can realize between all coils unit 1.
When needing to illustrate, the coupling coil group 2 of the present embodiment can also be applied to the magnetic resonance radio frequency receiving coil of more than four coil units 1, by the isolation regulating circuit 21 of coupling coil group 2, it equally also can realize the isolation between all coils unit 1, and the use that hinge structure reduces inductance can be realized, reach technique effects such as using inductance quantity few, simple and compact for structure, therefore do not repeat them here.
Claims (1)
1. one kind has the magnetic resonance radio frequency receiving coil of coil unit isolation features, comprise at least three coil units, it is characterized in that: described at least three coil units comprise at least one coupling coil group be made up of two coil units, public isolation regulating circuit is provided with between two coil units in described coupling coil group, described isolation regulating circuit is connected in two coil units of access coupling coil group simultaneously, described isolation regulating circuit comprises the electric capacity and the first inductance that are connected in series, inductance Mutual Inductance Coupling at least one coil unit outside described first inductance and described coupling coil group.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410027946.7A CN104783795A (en) | 2014-01-22 | 2014-01-22 | Magnetic resonance radio frequency receiving coil with coil unit isolating function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410027946.7A CN104783795A (en) | 2014-01-22 | 2014-01-22 | Magnetic resonance radio frequency receiving coil with coil unit isolating function |
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| CN104783795A true CN104783795A (en) | 2015-07-22 |
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| CN201410027946.7A Pending CN104783795A (en) | 2014-01-22 | 2014-01-22 | Magnetic resonance radio frequency receiving coil with coil unit isolating function |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05285121A (en) * | 1991-08-26 | 1993-11-02 | Philips Gloeilampenfab:Nv | Magnetic resonance device consisting of decoupling receiving coil |
| CN1183143A (en) * | 1995-04-28 | 1998-05-27 | 彼得·曼斯菲尔德 | Method and apparatus for canceling mutual inductance effects in a resonant coil assembly |
| CN1310345A (en) * | 2000-01-18 | 2001-08-29 | 通用电器横河医疗系统株式会社 | Radio-frequency coil, magnetic resonance imaging apparatus and receiving method of nuclear magnetic resonance signal |
| US20060255804A1 (en) * | 2005-05-13 | 2006-11-16 | General Electric | Three concentric coil array |
| US20090140740A1 (en) * | 2007-12-04 | 2009-06-04 | Jian Jun Du | Receiver coil array for magnetic resonance imaging |
| CN101520496A (en) * | 2008-02-29 | 2009-09-02 | 西门子（中国）有限公司 | Figure type coil for magnetic resonance imaging system |
| CN202854312U (en) * | 2012-09-04 | 2013-04-03 | 上海联影医疗科技有限公司 | Decoupling inductance circuit used between coil units and magnetic resonance system |
| CN103412271A (en) * | 2013-05-08 | 2013-11-27 | 深圳市特深电气有限公司 | Multi-channel nuclear magnetic resonance coil |
-
2014
- 2014-01-22 CN CN201410027946.7A patent/CN104783795A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05285121A (en) * | 1991-08-26 | 1993-11-02 | Philips Gloeilampenfab:Nv | Magnetic resonance device consisting of decoupling receiving coil |
| CN1183143A (en) * | 1995-04-28 | 1998-05-27 | 彼得·曼斯菲尔德 | Method and apparatus for canceling mutual inductance effects in a resonant coil assembly |
| CN1310345A (en) * | 2000-01-18 | 2001-08-29 | 通用电器横河医疗系统株式会社 | Radio-frequency coil, magnetic resonance imaging apparatus and receiving method of nuclear magnetic resonance signal |
| US20060255804A1 (en) * | 2005-05-13 | 2006-11-16 | General Electric | Three concentric coil array |
| US20090140740A1 (en) * | 2007-12-04 | 2009-06-04 | Jian Jun Du | Receiver coil array for magnetic resonance imaging |
| CN101520496A (en) * | 2008-02-29 | 2009-09-02 | 西门子（中国）有限公司 | Figure type coil for magnetic resonance imaging system |
| CN202854312U (en) * | 2012-09-04 | 2013-04-03 | 上海联影医疗科技有限公司 | Decoupling inductance circuit used between coil units and magnetic resonance system |
| CN103412271A (en) * | 2013-05-08 | 2013-11-27 | 深圳市特深电气有限公司 | Multi-channel nuclear magnetic resonance coil |
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Address after: Qingpu District of Shanghai city in 201707 Huaqing Road No. 1269 Applicant after: Shanghai Chengguang Medical Technologies Co.,Ltd. Address before: 201107 building 1199, Lane 8, Ji Zhai Road, Shanghai, Minhang District Applicant before: Shanghai Chengguang Medical Technologies Co.,Ltd. |
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