CN103698725A - Multi-channel radio frequency coil interface device for magnetic resonance imaging system - Google Patents
Multi-channel radio frequency coil interface device for magnetic resonance imaging system Download PDFInfo
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 32
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Abstract
本发明涉及一种磁共振成像系统的多通道射频线圈接口装置，包括接口电路盒和多路接口电路，每路接口电路包括：卡口螺母接口，设于所述接口电路盒的一侧，用于电连接一射频线圈；前置放大器，用于在接收模式时对所述射频线圈中感应的核磁共振电压信号进行放大；相移电路，与所述前置放大器电连接，用于调整所述射频线圈的阻抗的相位；调谐匹配电路，与所述相移电路电连接，用于对所述射频线圈的谐振频率进行校正；总线，设于所述接口电路盒上与所述卡口螺母接口相对的一侧，用于电连接磁共振成像检测设备，所述总线包括共模扼流环。本发明一方面方便了线圈的设计；另一方面降低了线圈开发成本，增强了磁共振成像系统的开放性和易用性。
The invention relates to a multi-channel radio frequency coil interface device for a magnetic resonance imaging system, which includes an interface circuit box and multiple interface circuits, and each interface circuit includes: a bayonet nut interface, which is arranged on one side of the interface circuit box, and used It is electrically connected to a radio frequency coil; the preamplifier is used to amplify the nuclear magnetic resonance voltage signal induced in the radio frequency coil in the receiving mode; the phase shift circuit is electrically connected to the preamplifier and used to adjust the The phase of the impedance of the radio frequency coil; the tuning matching circuit is electrically connected with the phase shift circuit, and is used to correct the resonant frequency of the radio frequency coil; the bus is arranged on the interface circuit box and interfaces with the bayonet nut The opposite side is used to electrically connect the magnetic resonance imaging detection equipment, and the bus includes a common mode choke ring. On the one hand, the invention facilitates the coil design; on the other hand, the coil development cost is reduced, and the openness and usability of the magnetic resonance imaging system are enhanced.
Description
Technical field
The present invention relates to magnetic resonance, particularly relate to a kind of Multi-channel radio-frequency coil interface arrangement of magnetic resonance imaging system.
Background technology
In order to improve the signal to noise ratio (S/N ratio) of magnetic resonance imaging (MRI-Magnetic Resonance Imaging) image and to accelerate image taking speed, the development trend of magnetic resonance radio frequency technology is to adopt Multi-channel radio-frequency coil.Generally by 2N(wherein, N is positive integer to Multi-channel radio-frequency coil) individual radio-frequency coil cell formation.When Multi-channel radio-frequency coil is in emission mode, each radio-frequency coil unit is passed to exchange current, for producing respectively alternating magnetic field, and the corresponding transmission channel of alternating magnetic field that each radio-frequency coil unit produces.When Multi-channel radio-frequency coil is in receiving mode, each radio-frequency coil unit, by electromagnetic induction, receives the magnetic resonance signal in imaging space, the corresponding receiving cable of magnetic resonance signal that each radio-frequency coil unit receives.In the ideal case, the alternating magnetic field that each radio-frequency coil unit produces is independently, and in other words, the alternating magnetic field that in 2N radio-frequency coil unit, any two radio-frequency coil unit produce is not impact each other.Yet, in actual applications, between two radio-frequency coil unit, may there is coupling phenomenon, especially for adjacent radio-frequency coil unit, coupling phenomenon is particularly outstanding, emission efficiency when this has just reduced Multi-channel radio-frequency coil emission mode and the signal to noise ratio (S/N ratio) when receiving mode.The port number maximum that can receive for radio-frequency coil in MRI system clinically at present, be generally 32.
Radio system is the functional unit of implementing radio-frequency (RF) excited in MRI system and receiving resonance signal, and it also comprises a series of relevant radio-frequency interface circuits except this core component of radio-frequency coil.Interface circuit one end connecting multi-channel radio-frequency coil, one end connects magnetic resonance system, and wherein magnetic resonance system end comprises radio-frequency power amplifier and prime amplifier, respectively corresponding emission mode and receiving mode.Two kinds of patterns are switched by radio-frequency (RF) switch.When being operated in emission mode, radio-frequency coil is connected with radio-frequency power amplifier, is excited into the imaging object in image space, produces magnetic resonance signal.When being operated in accepting state, the faint NMR(Nuclear Magnetic Resonance responding in coil) voltage signal is connected with low noise prime amplifier, signal is amplified, then after overdamping, mixing, intermediate frequency filtering, phase-detection and low frequency filtering, obtain remaining with the low frequency signal of NMR signal phase and amplitude information, through A/D conversion, obtain the raw data for image reconstruction again.
Traditional radio-frequency (RF) Receiving Device, is each coil unit of Multi-channel radio-frequency coil foremost, and each coil unit is finally connected in MRI system by unified interface, is a whole set of equipment from interface to coil, and interface circuit and coil are supporting settings.
For each magnetic test coil, all must the corresponding pre-amplification circuit of separate configurations and common mode inhibition ring etc.The cost of a set of like this configuration is often very worthy, has also expended many manpower and materials simultaneously.The present invention proposes a kind of general interface circuit design, can realize any hyperchannel and count inserting of coil and can pull out, needn't be for the special interface circuit of each coil configuration, thus reduced cost, improved ease for use and the accessibility of system.
Summary of the invention
Based on this, be necessary to provide a kind of interface circuit design of general Multi-channel radio-frequency coil, i.e. a kind of Multi-channel radio-frequency coil interface arrangement of magnetic resonance imaging system of the radio-frequency coil that is applicable to all size.
A Multi-channel radio-frequency coil interface arrangement for magnetic resonance imaging system, comprises interface circuit box and multichannel interface circuit, and every road interface circuit comprises: bayonet nut interface, be located at a side of described interface circuit box, for being electrically connected to a radio-frequency coil; Prime amplifier, amplifies for the nuclear magnetic resonance voltage signal of described radio-frequency coil being responded to when the receiving mode; Phase-shift circuit, is electrically connected to described prime amplifier, for adjusting the phase place of the impedance of described radio-frequency coil, thereby reduces the noise figure of described prime amplifier when work; Resonance matching circuit, is electrically connected to described phase-shift circuit, for the resonance frequency to described radio-frequency coil, proofreaies and correct; Bus, is located at a side relative with described bayonet nut interface on described interface circuit box, and for being electrically connected to magnetic resonance imaging checkout equipment, described bus comprises common mode chokes ring.
In an embodiment, described prime amplifier, phase-shift circuit and resonance matching circuit are for being connected in series therein.
In an embodiment, described every road interface circuit also comprises direct current signal line therein, and described direct current signal line one end connects the bus of this road interface circuit, and the other end connects the buckle nut interface of this road interface circuit; The DC control signal that described direct current signal line sends for receiving magnetic resonance imaging checkout equipment, the switch of control radio-frequency coil.
In an embodiment, described direct current signal line comprises the filtering circuit for filtering AC signal therein.
The Multi-channel radio-frequency coil interface arrangement of above-mentioned magnetic resonance imaging system, every road interface circuit can be realized single passage independent transmission, receive signal, realizes plug and pull, can realize any port number reception signal of simultaneously working simultaneously.Therefore be a kind of general interface circuit design, the radio-frequency coil of all size is all had to versatility, needn't, for the special interface circuit of each coil configuration, facilitate on the one hand the design of coil; Reduce on the other hand coil cost of development, strengthened opening and the ease for use of magnetic resonance imaging system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Multi-channel radio-frequency coil interface arrangement of magnetic resonance imaging system in an embodiment.
Embodiment
For object of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 1 is the structural representation of the Multi-channel radio-frequency coil interface arrangement of magnetic resonance imaging system in an embodiment, comprises interface circuit box 10 and multichannel interface circuit, and every road interface circuit comprises:
Bayonet nut interface (BNC) 12, is located at a side of interface circuit box 10, for being electrically connected to a radio-frequency coil.In the present embodiment for connecting radio-frequency coil 11.
Prime amplifier 17, amplifies for the nuclear magnetic resonance voltage signal of radio-frequency coil being responded to when the receiving mode.
Phase-shift circuit 15, is electrically connected to prime amplifier 17, for adjusting the phase place of the impedance of radio-frequency coil 11, thereby reduces the noise figure of prime amplifier 17 when work.The noise figure of prime amplifier 17 changes with the impedance variation of radio-frequency coil 11, and when the amplitude of coil impedance and phase place meet amplifier and require, the noise figure of prime amplifier 17 is minimum, and this situation is called noise matching.The effect of phase-shift circuit 15 is phase places of adjusting coil impedance, makes its requirement that meets noise matching, thereby makes the noise figure of prime amplifier 17 when work reach minimum as far as possible.
Resonance matching circuit 13, is electrically connected to phase-shift circuit 15, for the resonance frequency of radio-frequency coil 11 is proofreaied and correct.
Bus, is located at a side relative with bayonet nut interface 12 on interface circuit box 10, for being electrically connected to magnetic resonance imaging checkout equipment.In every bus, be provided with common mode chokes ring 19, for suppressing the common mode current in bus.
Understandable, in the interface circuit of Mei road, can also configure other circuit elements devices such as radio-frequency (RF) switch, therefore prime amplifier is not drawn as to direct-connected state with corresponding bus in Fig. 1.
In use, Multi-channel radio-frequency coil and bayonet nut interface are pegged graft, the joint of the bus of interface circuit box 10 opposite sides is inserted on magnetic resonance imaging checkout equipment, can realize transmitting and receiving of signal.
In an embodiment, every road interface circuit also comprises a direct current signal line therein.Direct current signal line one end connects corresponding bus, and the other end connects corresponding radio-frequency coil (connecting BNC).Magnetic resonance imaging checkout equipment is to DC control signal of direct current signal line, for controlling the switch of radio-frequency coil.Such as 8 radio-frequency coils of having pegged graft, but only need wherein 4 work, just can send DC control signal by magnetic resonance imaging checkout equipment, other 4 tunnels are disconnected.Every direct current signal line comprises a filtering circuit, for filtering AC signal, in order to avoid there is AC signal to be coupled in direct current signal line.
The quantity (port number) of the interface circuit of the Multi-channel radio-frequency coil interface arrangement of above-mentioned magnetic resonance imaging system should with in magnetic resonance imaging system receiving cable number and transmission channel number larger one identical, every road interface circuit can be realized single passage independent transmission, receive signal, realize plug and pull, can realize any port number reception signal of simultaneously working simultaneously.Therefore be a kind of general interface circuit design, the radio-frequency coil of all size is all had to versatility, needn't, for the special interface circuit of each coil configuration, facilitate on the one hand the design of coil; Reduce on the other hand coil cost of development, strengthened opening and the ease for use of magnetic resonance imaging system.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (4)
1. a Multi-channel radio-frequency coil interface arrangement for magnetic resonance imaging system, is characterized in that, comprises interface circuit box and multichannel interface circuit, and every road interface circuit comprises:
Bayonet nut interface, is located at a side of described interface circuit box, for being electrically connected to a radio-frequency coil;
Prime amplifier, amplifies for the nuclear magnetic resonance voltage signal of described radio-frequency coil being responded to when the receiving mode;
Phase-shift circuit, is electrically connected to described prime amplifier, for adjusting the phase place of the impedance of described radio-frequency coil, thereby reduces the noise figure of described prime amplifier when work;
Resonance matching circuit, is electrically connected to described phase-shift circuit, for the resonance frequency to described radio-frequency coil, proofreaies and correct;
Bus, is located at a side relative with described bayonet nut interface on described interface circuit box, and for being electrically connected to magnetic resonance imaging checkout equipment, described bus comprises common mode chokes ring.
2. the Multi-channel radio-frequency coil interface arrangement of magnetic resonance imaging system according to claim 1, is characterized in that, described prime amplifier, phase-shift circuit and resonance matching circuit are for being connected in series.
3. the Multi-channel radio-frequency coil interface arrangement of magnetic resonance imaging system according to claim 1, it is characterized in that, described every road interface circuit also comprises direct current signal line, described direct current signal line one end connects the bus of this road interface circuit, and the other end connects the buckle nut interface of this road interface circuit; The DC control signal that described direct current signal line sends for receiving magnetic resonance imaging checkout equipment, the switch of control radio-frequency coil.
4. the Multi-channel radio-frequency coil interface arrangement of magnetic resonance imaging system according to claim 1, is characterized in that, described direct current signal line comprises the filtering circuit for filtering AC signal.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104473644A (en) * | 2014-12-31 | 2015-04-01 | 中国科学院深圳先进技术研究院 | Coil control system and head and neck combined coil for magnetic resonance imaging |
| CN106574955A (en) * | 2014-07-24 | 2017-04-19 | Ge医疗系统环球技术有限公司 | Surface coil sensitivity correction using magnetic resonance data simultaneously received by the surface coil and a body coil |
| CN106842087A (en) * | 2017-01-22 | 2017-06-13 | 上海东软医疗科技有限公司 | Radio-frequency sending coil drive circuit and MR imaging apparatus |
| CN106842088A (en) * | 2017-03-30 | 2017-06-13 | 中国科学院武汉物理与数学研究所 | A kind of receiving channel for magnetic resonance radio frequency coil merges device |
| CN107121652A (en) * | 2017-05-10 | 2017-09-01 | 合肥工业大学 | For the multifrequency point array RF receiving coil system in MR imaging apparatus |
| CN107209235A (en) * | 2015-01-21 | 2017-09-26 | 皇家飞利浦有限公司 | The automatic impedance regulation of multi-channel RF coil block |
| CN107430175A (en) * | 2015-03-27 | 2017-12-01 | 皇家飞利浦有限公司 | The magnetic resonance volume coils and its operating method of channel are received with multiple independent transmittings |
| US20210215778A1 (en) * | 2016-09-29 | 2021-07-15 | Hyperfine Research, Inc. | Radio frequency coil tuning methods and apparatus |
| CN114019436A (en) * | 2021-11-09 | 2022-02-08 | 深圳先进技术研究院 | Magnetic resonance coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106574955A (en) * | 2014-07-24 | 2017-04-19 | Ge医疗系统环球技术有限公司 | Surface coil sensitivity correction using magnetic resonance data simultaneously received by the surface coil and a body coil |
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| CN106842087A (en) * | 2017-01-22 | 2017-06-13 | 上海东软医疗科技有限公司 | Radio-frequency sending coil drive circuit and MR imaging apparatus |
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| CN107121652A (en) * | 2017-05-10 | 2017-09-01 | 合肥工业大学 | For the multifrequency point array RF receiving coil system in MR imaging apparatus |
| CN107121652B (en) * | 2017-05-10 | 2019-11-08 | 合肥工业大学 | Multi-frequency point array radio frequency receiving coil system used in magnetic resonance imaging equipment |
| CN114019436A (en) * | 2021-11-09 | 2022-02-08 | 深圳先进技术研究院 | Magnetic resonance coil |
| CN114019436B (en) * | 2021-11-09 | 2024-06-18 | 深圳先进技术研究院 | Magnetic resonance coil |
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