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 PDF

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CN103698725A
CN103698725A CN 201310557950 CN201310557950A CN103698725A CN 103698725 A CN103698725 A CN 103698725A CN 201310557950 CN201310557950 CN 201310557950 CN 201310557950 A CN201310557950 A CN 201310557950A CN 103698725 A CN103698725 A CN 103698725A
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magnetic resonance
interface
radio frequency
coil
circuit
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CN 201310557950
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Chinese (zh)
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胡小情
李烨
陈潇
钟耀祖
刘新
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深圳先进技术研究院
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Abstract

The invention relates to a multi-channel radio frequency coil interface device for a magnetic resonance imaging system. The device comprises an interface circuit box and a plurality of interface circuits, wherein each interface circuit comprises a bayonet nut interface, a pre-amplifier, a phase shifting circuit, a tuning matching circuit and a bus, wherein the bayonet nut interface is arranged on one side of the interface circuit box and is used for being electrically connected with a radio frequency coil; the pre-amplifier is used for amplifying a nuclear magnetic resonance signal sensed in the radio frequency coil in a receiving mode; the phase shifting circuit is electrically connected with the pre-amplifier and is used for adjusting the phase of the impedance of the radio frequency coil; the tuning matching circuit is electrically connected with the phone shifting circuit and is used for correcting the resonant frequency of the radio frequency coil; the bus is arranged on one side, opposite to the bayonet nut interface, of the interface circuit box, and is used for being electrically connected with magnetic resonance imaging detection equipment; the bus comprises a common-mode choke ring. On one hand, the design of the coil is facilitated, and on the other hand, the development cost of the coil is lowered, and the openness and the usability easiness of the magnetic resonance imaging system are improved.

Description

磁共振成像系统的多通道射频线圈接口装置 Multi-channel radio frequency coil of the magnetic resonance imaging system interface means

技术领域 FIELD

[0001] 本发明涉及磁共振,特别是涉及一种磁共振成像系统的多通道射频线圈接口装置。 [0001] The present invention relates to magnetic resonance, and more particularly to a magnetic resonance imaging system is a multi-channel radio frequency coil interface means.

背景技术 Background technique

[0002] 为了提高磁共振成像(MR1-Magnetic Resonance Imaging)图像的信噪比和加快成像速度,磁共振射频技术的发展趋势是采用多通道射频线圈。 [0002] In order to enhance magnetic resonance imaging (MR1-Magnetic Resonance Imaging) image SNR and accelerate the imaging speed, the magnetic resonance radio frequency technology development trend is to use a multi-channel radio frequency coil. 多通道射频线圈一般由2N(其中,N为正整数)个射频线圈单元构成。 Usually a multi-channel radio frequency coil 2N (where, N is a positive integer) constituting the RF coil unit. 当多通道射频线圈处于发射模式,每个射频线圈单元被通以交变电流,用于分别产生交变磁场,每个射频线圈单元所产生的交变磁场对应一个发射通道。 When the multi-channel radio frequency coil in the transmit mode, each radio frequency coil unit to alternating current is passed, for respectively generating an alternating magnetic field coil unit each radio frequency alternating magnetic field generated by a corresponding one of transmit channel. 当多通道射频线圈处于接收模式,每个射频线圈单元通过电磁感应,接收成像空间内的磁共振信号,每个射频线圈单元接收的磁共振信号对应一个接收通道。 When the multi-channel radio frequency coil is in the receive mode, each radio frequency unit by electromagnetic induction coil, receiving magnetic resonance signals in the imaging space corresponding to each radio frequency magnetic resonance signals received by a coil unit receiving channel. 在理想情况下,每个射频线圈单元所产生的交变磁场是独立的,换句话说,2N个射频线圈单元中任意两个射频线圈单元所产生的交变磁场彼此之间没有影响。 In the ideal case, each radio frequency alternating magnetic field generated by the coil unit is independent, in other words, without any influence on one another radio frequency coil units 2N any two RF coil units generated by the alternating magnetic field. 然而,在实际应用中,两个射频线圈单元之间可能会发生耦合现象,尤其对于相邻的射频线圈单元,耦合现象尤为突出,这就降低了多通道射频线圈发射模式时的发射效率和处于接收模式时的信噪比。 However, in practical applications, coupling phenomenon may occur between the two RF coil unit, especially for the adjacent RF coil unit coupled phenomenon is particularly prominent, which reduces the emission efficiency of the radio frequency coil in the transmission mode and multi-channel SNR receive mode. 目前,临床上的MRI系统中可以用于射频线圈接收的通道数最大一般为32。 At present, MRI system may be used for clinical Usually the maximum number of channels received by the RF coil 32.

[0003] 射频系统是MRI系统中实施射频激励并接收共振信号的功能单元,它除了射频线圈这一核心部件之外,还包括一系列相关的射频接口电路。 [0003] MRI RF system is implemented in the radio frequency excitation system and a receiving function unit resonance signals, which in addition to the RF coil the core member, further comprising a series of related radio frequency interface circuit. 接口电路一端连接多通道射频线圈,一端连接磁共振系统,其中磁共振系统端包括射频功率放大器和前置放大器,分别对应发射模式和接收模式。 An interface circuit connected to one end of a multi-channel radio frequency coil having one end connected to a magnetic resonance system, wherein the magnetic resonance system includes a radio frequency power amplifier side and a preamplifier, respectively transmit and receive mode. 两种模式通过射频开关进行切换。 Modes switched by the RF switch. 当工作在发射模式时,射频线圈与射频功率放大器连接,激发成像空间内的成像物体,产生磁共振信号。 When operating in a transmit mode, the RF coil and the RF power amplifier is connected, excitation of the imaged object within the imaging space, the magnetic resonance signal is generated. 当工作在接收状态时,在线圈中感应的微弱的NMR (Nuclear Magnetic Resonance)电压信号与低噪声的前置放大器相连,对信号进行放大,然后经过衰减、混频、中频滤波、相位检测和低频滤波后得到保留有NMR信号相位和幅度信息的低频信号,再经过A/D变换,得到用于图像重建的原始数据。 When operating in the receiving state, (Nuclear Magnetic Resonance) signal and a low-noise voltage preamplifier connected to the weak NMR induced in the coil, the signal is amplified and then attenuated, a mixer, an intermediate frequency filter, a phase detector and low frequency after filtering the low frequency signal has a retention NMR signal phase and amplitude information, and then through the a / D conversion, the original data for image reconstruction.

[0004] 传统的射频接收装置,最前端是多通道射频线圈的各个线圈单元,每个线圈单元最后通过统一接口连接到MRI系统上,从接口到线圈是一整套设备,即接口电路与线圈是配套设置的。 [0004] The conventional RF receiving means, the most distal coil units are multi-channel RF coils, each coil unit is finally connected to the MRI system via a uniform interface, the interface from the device to the coil is set, i.e., an interface circuit and the coil is matching set.

[0005] 对于每一种检测线圈,都必须独立配置相应的前置放大电路和共模抑制环等。 [0005] For each of the detection coil must be independent of the configuration of the preamplifier circuit and a respective common-mode rejection ring. 这样一套配置的成本往往价值不菲,同时还耗费了不少人力物力。 The cost of such a configuration is often valuable, but also spent a lot of manpower and resources. 本发明提出一种通用的接口电路设计,能够实现任意多通道数线圈的可插可拔,不必针对每个线圈配置专门的接口电路,从而降低了成本,提高了系统的易用性和可接入性。 The present invention provides a common interface circuit designed to implement any number of the multi-channel coil plug can be pulled, is not necessary to configure a special interface circuit for each coil, thus reducing the cost and improve ease of use and can be accessed by the system into sex.

发明内容 SUMMARY

[0006] 基于此,有必要提供一种通用的多通道射频线圈的接口电路设计,即一种适用于各种规格的射频线圈的磁共振成像系统的多通道射频线圈接口装置。 [0006] Based on this, it is necessary to provide a common interface circuit multichannel RF coil, i.e., a radio frequency coil for multi-channel interface device of a magnetic resonance imaging system of a variety of radio frequency coil. [0007] —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,从而减小所述前置放大器在工作时的噪声系数;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。 [0007] - multi-channel RF coil interface means species magnetic resonance imaging system, comprising an interface circuit and multiplexer box interface circuit, each line interface circuit comprising: an interface bayonet nut, disposed on a side of said interface circuit box, with electrically connected to a radio frequency coil; a preamplifier for amplifying the voltage signal of the radio frequency magnetic resonance induced in the coil in a reception mode; phase shift circuit, electrically connected to the preamplifier, for adjusting the phase of the impedance of the RF coil, thereby reducing the noise figure of the preamplifier in operation; tunable matching circuit, and the phase shift circuit is electrically connected to a resonant frequency of the RF coil is corrected; bus, provided at the interface with the bayonet nut on the side opposite to the cartridge interface circuit, for detecting the magnetic resonance imaging apparatus is electrically connected, said bus comprising a common mode choke ring.

[0008] 在其中一个实施例中,所述前置放大器、相移电路与调谐匹配电路为串联连接。 [0008] In one embodiment, the preamplifier, tunable matching circuit and the phase shift circuit connected in series.

[0009] 在其中一个实施例中,所述每路接口电路还包括直流信号线,所述直流信号线一端连接该路接口电路的总线,另一端连接该路接口电路的卡扣螺母接口;所述直流信号线用于接收磁共振成像检测设备发送的直流控制信号,控制射频线圈的开关。 [0009] In one embodiment, each of the line interface circuit further comprises a DC signal line, a signal line having one end connected to the DC bus of the interface circuit path, the other end of the locking nut channel interface circuit interfaces; the DC-DC signal lines for receiving said magnetic resonance imaging apparatus transmits a control signal detection, RF coil control switch.

[0010] 在其中一个实施例中,所述直流信号线包括用于滤除交流信号的滤波电路。 [0010] In one embodiment, the DC signal lines includes a filter circuit to filter out AC signals.

[0011] 上述磁共振成像系统的多通道射频线圈接口装置,每路接口电路可以实现单个通道独立发射、接收信号,实现即插即拔,同时能够实现任意通道数同时工作接收信号。 [0011] The multi-channel RF coil interface means of the magnetic resonance imaging system, each channel interface circuit may implement a single-channel independent transmit, receive signals, i.e. to achieve pull plug, any channel can be achieved while the number of simultaneously received signals. 因此是一种通用的接口电路设计,对各种规格的射频线圈均具有通用性,不必针对每个线圈配置专门的接口电路,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。 Therefore a common interface circuit design, a variety of radio frequency coils are generic and do not have a dedicated interface circuit arranged for each coil, one hand to facilitate the design of the coil; the other hand, reduces development costs coil, enhance the openness and ease of use of magnetic resonance imaging system.

附图说明 BRIEF DESCRIPTION

[0012] 图1是一实施例中磁共振成像系统的多通道射频线圈接口装置的结构示意图。 [0012] FIG. 1 is a schematic view of a multi-channel radio frequency coil of the interface device of the embodiment of a magnetic resonance imaging system. 具体实施方式 detailed description

[0013] 为使本发明的目的、特征和优点能够更为明显易懂,下面结合附图对本发明的具体实施方式做详细的说明。 [0013] For purposes of the present invention, features and advantages are more apparent from the following drawings in conjunction with a detailed description of specific embodiments of the present invention.

[0014] 图1是一实施例中磁共振成像系统的多通道射频线圈接口装置的结构示意图,包括接口电路盒10和多路接口电路,每路接口电路包括: [0014] FIG. 1 is a schematic view of a multi-channel radio frequency coil interface device of a magnetic resonance imaging system of the embodiment, the cassette 10 includes an interface circuit and multiplexer interface circuit, each line interface circuit comprises:

[0015] 卡口螺母接口(BNC) 12,设于接口电路盒10的一侧,用于电连接一射频线圈。 [0015] Interface bayonet nut (BNC) 12, an interface circuit is provided at one side of the cassette 10, for electrically connecting a RF coil. 本实施例中用于连接射频线圈11。 The present embodiment for connecting the radio frequency coil 11.

[0016] 前置放大器17,用于在接收模式时对射频线圈中感应的核磁共振电压信号进行放大。 [0016] The pre-amplifier 17 for amplifying the voltage signal induced in the NMR RF coil in the receive mode.

[0017] 相移电路15,与前置放大器17电连接,用于调整射频线圈11的阻抗的相位,从而减小前置放大器17在工作时的噪声系数。 [0017] The phase shift circuit 15, electrically connected to a preamplifier 17, for adjusting the phase of the impedance of the RF coil 11, thereby reducing the noise figure of the preamplifier 17 at work. 前置放大器17的噪声系数随射频线圈11的阻抗变化而变化,当线圈阻抗的幅值和相位满足放大器要求时,前置放大器17的噪声系数最小,这种情况称为噪声匹配。 Noise figure of the preamplifier 17 with the RF coil 11 varies the impedance variation, when the coil impedance magnitude and phase of the amplifier to meet the requirements, the minimum noise figure of the preamplifier 17, this is called noise matching. 相移电路15的作用是调整线圈阻抗的相位,使其满足噪声匹配的要求,从而使得前置放大器17在工作时的噪声系数尽量达到最小。 Effect of the phase shift circuit 15 is to adjust the phase of the impedance of the coil, to meet the requirements of noise matching, so that the noise figure of the preamplifier 17 as much as possible during operation to a minimum.

[0018] 调谐匹配电路13,与相移电路15电连接,用于对射频线圈11的谐振频率进行校正。 [0018] The tunable matching circuit 13, the phase shift circuit 15 is electrically connected, for the resonance frequency of the RF coil 11 is corrected.

[0019] 总线,设于接口电路盒10上与卡口螺母接口12相对的一侧,用于电连接磁共振成像检测设备。 [0019] The bus interface circuit provided in the cartridge 10 and the opposite side of the interface 12 bayonet nut connector for electrically detecting a magnetic resonance imaging apparatus. 每条总线上设置有共模扼流环19,用于抑制总线上的共模电流。 It is provided with a common mode choke ring 19, for suppressing the common mode current on the bus on each bus. [0020] 可以理解的,在每路接口电路中,还可以配置射频开关等其它电路元器件,故图1中未将前置放大器与对应的总线画成直接连接的状态。 [0020] will be appreciated that, in each line interface circuit may also be configured radio frequency switch circuits and other components, in a state not corresponding to the pre-amplifier is directly connected to the bus so drawn in FIG.

[0021] 在使用时,将多通道射频线圈与卡口螺母接口插接,将接口电路盒10另一侧的总线的接头插到磁共振成像检测设备上,即可实现信号的发射和接收。 [0021] In use, the multi-channel RF coil bayonet nut connector interfaces, the bus interface circuit 10 on the other side of the connector plug into the cartridge detecting the magnetic resonance imaging apparatus, can be realized transmitting and receiving signals.

[0022] 在其中一个实施例中,每路接口电路还包括一条直流信号线。 [0022] In one embodiment, each line interface circuit further comprises a DC signal line. 直流信号线一端连接对应的总线,另一端连接对应的射频线圈(即连接BNC)。 DC signal corresponding to a bus line connecting one end and the other end connected to the corresponding RF coil (i.e., connecting BNC). 磁共振成像检测设备给直流信号线一个直流控制信号,用于控制射频线圈的开关。 The magnetic resonance imaging apparatus for detecting a DC current control signal is a signal line for controlling the switching of the RF coil. 比如插接了8个射频线圈,但只需要其中4个工作,就可以由磁共振成像检测设备发送直流控制信号,将另外4路断开。 For example the RF coil docking eight, but only four of the work, the DC control signal can be transmitted by detecting the magnetic resonance imaging apparatus, four additional Disconnect. 每条直流信号线包括一个滤波电路,用于滤除交流信号,以免有交流信号耦合到直流信号线中。 Each signal line comprises a DC filter circuit for filtering the AC signal, in order to avoid AC signal is coupled to the DC signal lines.

[0023] 上述磁共振成像系统的多通道射频线圈接口装置的接口电路的数量(通道数)应该与磁共振成像系统接收通道数和发射通道数中的较大的一个相同,每路接口电路可以实现单个通道独立发射、接收信号,实现即插即拔,同时能够实现任意通道数同时工作接收信号。 [0023] The number of the interface circuit in the magnetic resonance imaging system is a multi-channel radio frequency coil interface device (channels) should receive a greater number of channels and the same number of transmit channels and a magnetic resonance imaging system, each channel interface circuit may implement a single-channel independent transmit, receive signals, to achieve plug and pulled, while being able to achieve any number of channels simultaneously received signals. 因此是一种通用的接口电路设计,对各种规格的射频线圈均具有通用性,不必针对每个线圈配置专门的接口电路,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。 Therefore a common interface circuit design, a variety of radio frequency coils are generic and do not have a dedicated interface circuit arranged for each coil, one hand to facilitate the design of the coil; the other hand, reduces development costs coil, enhance the openness and ease of use of magnetic resonance imaging system.

[0024] 以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。 [0024] Expression of the above-described embodiments are only several embodiments of the present invention, and detailed description thereof is more specific, but can not therefore be understood as limiting the scope of the present invention. 应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。 It should be noted that those of ordinary skill in the art, without departing from the spirit of the present invention, can make various changes and modifications, which fall within the protection scope of the present invention. 因此,本发明专利的保护范围应以所附权利要求为准。 Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (4)

  1. 1.一种磁共振成像系统的多通道射频线圈接口装置,其特征在于,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,从而减小所述前置放大器在工作时的噪声系数; 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。 1. A magnetic resonance imaging system is a multi-channel radio frequency coil interface apparatus, wherein the cartridge includes an interface circuit and multiplexer interface circuit, each line interface circuit comprising: an interface bayonet nut, the interface circuit provided in a cassette side, for electrically connecting a RF coil; a preamplifier for amplifying the voltage signal of the radio frequency magnetic resonance induced in the coil in a reception mode; phase shift circuit, electrically connected to the preamplifier, for adjusting phase of the impedance of the RF coil, thereby reducing the noise figure of the preamplifier in operation; tunable matching circuit, and the phase shift circuit is electrically connected to a resonant frequency of the RF coil is corrected ; bus interfaces with the bayonet nut is provided on a side opposite to the cartridge interface circuit, for detecting the magnetic resonance imaging apparatus is electrically connected, said bus comprising a common mode choke ring.
  2. 2.根据权利要求1所述的磁共振成像系统的多通道射频线圈接口装置,其特征在于,所述前置放大器、相移电路与调谐匹配电路为串联连接。 Multi-channel radio frequency coil 2. The interface means of the magnetic resonance imaging system according to claim 1, characterized in that the preamplifier, tunable matching circuit and the phase shift circuit connected in series.
  3. 3.根据权利要求1所述的磁共振成像系统的多通道射频线圈接口装置,其特征在于,所述每路接口电路还包括直流信号线,所述直流信号线一端连接该路接口电路的总线,另一端连接该路接口电路的卡扣螺母接口;所述直流信号线用于接收磁共振成像检测设备发送的直流控制信号,控制射频线圈的开关。 The interface device of multi-channel RF coil of the magnetic resonance imaging system as claimed in claim 1, wherein each of said line interface circuit further comprises a DC signal line, a signal line having one end connected to the current path of the bus interface circuit , and the other end connected to the locking nut channel interface circuit interfaces; DC of the DC signal lines for receiving a magnetic resonance imaging apparatus transmits a control signal detection, RF coil control switch.
  4. 4.根据权利要求1所述的磁共振成像系统的多通道射频线圈接口装置,其特征在于,所述直流信号线包括用于滤除交流信号的滤波电路。 The multi-channel radio frequency coil interface device of a magnetic resonance imaging system according to claim 1, characterized in that said DC signal comprises a line filter circuit for filtering the AC signal.
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