WO2012048621A1 - 电磁干扰抑制装置及采用该装置的磁共振成像设备 - Google Patents

电磁干扰抑制装置及采用该装置的磁共振成像设备 Download PDF

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WO2012048621A1
WO2012048621A1 PCT/CN2011/080359 CN2011080359W WO2012048621A1 WO 2012048621 A1 WO2012048621 A1 WO 2012048621A1 CN 2011080359 W CN2011080359 W CN 2011080359W WO 2012048621 A1 WO2012048621 A1 WO 2012048621A1
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shielding
electromagnetic interference
suppression device
interference suppression
magnetic resonance
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PCT/CN2011/080359
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English (en)
French (fr)
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任中昌
杨利维
徐涛
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深圳迈瑞生物医疗电子股份有限公司
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Publication of WO2012048621A1 publication Critical patent/WO2012048621A1/zh

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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
    • G01R33/42—Screening
    • G01R33/422—Screening of the radio frequency field
    • 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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  • the present invention relates to an electromagnetic interference suppression device and a magnetic resonance imaging apparatus using the same.
  • Magnetic Resonance Imaging Magnetic Resonance Imaging
  • MRI Magnetic Resonance Imaging
  • the basic working principle of magnetic resonance imaging is to use electromagnetic resonance phenomena to obtain electromagnetic signals from the human body and reconstruct human body information.
  • Hydrogen protons are divided into two energy levels under static magnetic field. Under RF excitation, hydrogen protons will transition from low energy level to high energy level, and RF pulses will be removed. Hydrogen protons will transition from high energy level to low energy level and emit RF. Energy, this RF energy is received by the MRI's receiving coil and processed into an MRI image.
  • Common MRI equipment mainly includes main magnet, gradient coil, RF coil, gradient power amplifier, RF power amplifier, sequence control system, console computer and shielded indoor interactive control system.
  • the main magnet is used to provide a uniform basic magnetic field
  • the gradient coil is used to provide a magnetic field that varies with position to distinguish different spatial positions
  • the radio frequency coil is used to transmit an excitation pulse and receive an MRI signal. Since the signal received by the MRI RF coil is usually very weak, the leakage electromagnetic waves emitted by various electronic components in the system, such as the CPU and the DC power conversion circuit, may cause serious interference to the image signal and even drown the MRI signal.
  • the front magnets such as the main magnet, the gradient coil, and the RF coil are placed in a special large shielded room
  • the main control components such as the gradient power amplifier, the RF power amplifier, the sequence control system, and the console computer are placed in isolation from the shielded room.
  • the shielded room can only be placed with some control components with simple structure and low running speed to form an interactive control system, resulting in a single control mode in the shielded room, which can not achieve complex control, which brings a series of problems, such as doctors only
  • the main image operation can be performed outside the shielded room, and the patient can be observed through the transparent partition between the shielded room and the control room.
  • An electromagnetic interference suppression device includes a shielding box and a conductive plate, the shielding box includes a plurality of shielding plates, the plurality of shielding plates enclose a shielding space, the conductive plate is received in the shielding space and fixed in the shielding
  • the shielding plate of the box is used to carry an interference source card that generates electromagnetic interference.
  • a magnetic resonance imaging apparatus comprising a main magnet, a gradient coil and a radio frequency coil placed in a shielding chamber, a control system and an electromagnetic interference suppression device, wherein the control system and the electromagnetic interference suppression device are disposed in the shielding room, the control
  • the system includes a control board that is fixed and received in the electromagnetic interference suppression device.
  • the electromagnetic interference suppression device includes a shielding box and a conductive plate.
  • the shielding box includes a plurality of shielding plates. The shielding plate is received in the shielding space and is fixed on the shielding plate of the shielding box, and the control board is fixed on the conductive plate.
  • An electromagnetic interference suppression device and a magnetic resonance imaging device using the same wherein a control board for electromagnetic interference of an MRI signal in a device is received by a shielding box, electromagnetic interference is reduced, and a conductive plate is used
  • the control board is fixed on the shielding box, and the conductive board forms a low impedance current loop, further reducing the electromagnetic interference generated by the control board on the MRI signal, so that a shielded room control system such as that described in the embodiment can be disposed in the shielding room.
  • the imaging control system allows the operator to implement complex imaging control in the shielded room for easy operation of the MRI device.
  • FIG. 1 is a system block diagram of a magnetic resonance imaging apparatus according to a preferred embodiment of the present invention
  • FIG. 2 is a schematic structural view of an electromagnetic interference suppression device according to a preferred embodiment of the present invention.
  • the MRI apparatus 1 is a system block diagram of a magnetic resonance imaging apparatus (hereinafter referred to as an MRI apparatus) according to a preferred embodiment of the present invention.
  • the MRI apparatus 1 includes a main magnet 100, a gradient coil 102, a radio frequency coil 104, a shielded room control system centered on the shielded room control board 110, a console system 150, a bed and bed control system 130, a sequence control system 120, and a launch Channel 172, receive channel 170, RF power amplifier 180, and gradient power amplifier 182.
  • the main magnet 100 provides a uniform basic magnetic field for imaging
  • the gradient coil 102 provides a magnetic field that varies with position to resolve different spatial locations.
  • the radio frequency coil 104 includes a transmitting coil and a receiving coil.
  • the sequence control system 120 is used to output various types of control sequences required by the device.
  • the shielded room control system also includes a control input device 112, a touch screen 114, a display 116, and a physiological gate 118 that are coupled to the shielded room control board.
  • the console system 150 is composed of a PC or a computer.
  • the main magnet 100, the gradient coil 102, the radio frequency coil 104, the shielded room control system centered on the shielded room control board 110, the transmitting channel 172, the receiving channel 170, and the hospital bed and hospital bed control system 130 are placed in electromagnetic shielding with the surrounding area.
  • Sequence control system 120, RF power amplifier 180, and gradient power amplifier 182 are placed in the MRI equipment room.
  • the console system 150 can be placed in a normal control room. Between the sequence control system 120 and the shielded room control board 110, the shielded room control board 110 and the console system 150 are connected by fiber optic communication. A conventional data transmission connection is used between the sequence control system 120 and the console system.
  • the sequence control system 120 outputs a radio frequency signal that satisfies the resonance condition under the control of the console system 150 or the shielded room control system.
  • the radio frequency signal is amplified by the RF power amplifier 180, and the amplified RF signal is transmitted through the transmission channel 172.
  • a transmitting coil in the RF coil 104 is emitted to an imaging target, thereby exciting an imaging target to generate nuclear magnetic resonance.
  • the receiving coil of the RF coil 104 senses the MRI signal, and the MRI signal is received by the receiving channel 170 and the sequence control system 120 and subjected to preamplification, mixing, analog/digital conversion, etc., and then input to the console system. 150 or shielded room control board 110.
  • the sequence control system 120 issues a gradient control signal, which is amplified by the gradient power amplifier 182 and output to the gradient coil 102.
  • the gradient coil 102 generates a gradient magnetic field to spatially position the MRI signal.
  • the MRI signal is processed by the console system 150 or the shielded room control board 110 to obtain an MRI image of the imaging target and visually displayed to the operator via a display device or display 116 in the console system 150.
  • image information can also be stored for later recall when needed.
  • the operator can control and observe the MRI imaging through the console system 150 outside the shielded room.
  • the shielded room control system can also similarly control the acquisition of the MRI signal and the image processing through the shielded room control board 110, so that the operator can also control the imaging through the shielded room control system in the shielded room.
  • the control input device 112 provided in the shielded room control board 110 may be a button, a trackball, a keyboard, or the like.
  • the shielded room control system can also include a touch screen 114 that inputs control signals directly through the touch screen 114 and displays the MRI images. It is also possible to access the display 116 of the large screen to display an image for the operator to observe, such as a liquid crystal display.
  • the shielded room control board 110 is connected to the hospital bed and the bed control system 130 in addition to imaging control to control the movement of the bed.
  • the physiological gating 118 such as electrocardiographic gating
  • the electrocardiographic information can be fused to the MRI signal to reduce motion artifacts, or the diastolic contraction of each compartment in the cardiac cycle can be observed in a movie manner.
  • the control panel of the shielded room control board 110 is provided with the electromagnetic interference suppression device 119 of the present invention, so that the interference signal emitted by the electronic components on the control board is shielded to ensure no interference with the MRI signal. .
  • the signal acquisition and processing may also be just a shielded room control system, and the console system 150 controls the MRI imaging by communication with the shielded room control system.
  • the console system 150 controls the MRI imaging by communication with the shielded room control system.
  • only the console system 150 can perform acquisition processing on the MRI signal, and the shielded room control system performs data and control signal transmission through communication with the console system 150 to achieve control of the MRI imaging or just
  • the MRI image information transmitted by the console system 150 is received, so that the doctor can perform image observation in the shielding room. In actual use, it can be set as needed, and is not limited to the above.
  • the console system shielded room control system can use TCP/IP protocol Ethernet communication, and the console system is connected to the shielded room control system through fiber optic communication. Both the console system and the shielded room control system can control the acquisition of MRI signals and image processing. In other embodiments, a selector switch can also be provided for selecting the operation of the shielded room control system or the console system.
  • the control board 110 of the shielded room control system is the main component that interferes with the MRI signal, the electromagnetic interference suppression apparatus in the present embodiment is mainly provided for the control board 110.
  • the control board is As an example of an interference source board.
  • a similar electromagnetic interference suppression device can be designed for it.
  • the control board 110 is a board that controls functions in the shielded room control system, and is centered on a central processing unit (CPU) or a field programmable gate array (FPGA), and is provided with built-in or external memory, logic, and bus. Devices and various peripherals and I/O.
  • the main control circuit board may be an x86 industrial computer board, which includes a CPU, a north bridge (drive memory), a memory, a south bridge (drives a PCI bus, provides multi-function I/O), and a display control device.
  • the control board 110 can be an FPGA-based control system, and can embed a CPU soft core.
  • the FPGA can generate various peripherals, and is equipped with a memory and a driving device to form a complete control system board. .
  • the control board 110 is fixed to the conductive plate 11 by screws 14.
  • the conductive plate 11 is fixed to a shielding plate of the shielding box 10 by screws 13, and the conductive plate 11 and the shielding box 10 are grounded.
  • the shape of the complete shielding box is not shown in the figure, but it is understood by those skilled in the art that the shielding box is a closed three-dimensional structure, which may be a structure such as a rectangular parallelepiped or a cylinder, and the shape can be selected according to actual conditions. .
  • the shield case is made of metal such as copper, aluminum, or aluminum alloy.
  • the conductive plate is made of metal, or a material having good electrical conductivity such as an alloy, and the metal may preferably be copper or aluminum.
  • the grounding of the conductive plate is connected to the metal plate by screws, and the metal plate becomes a low-impedance current loop, which reduces the external interference of the control board 110 itself.
  • the control board 110 includes electronic components such as processing, driving, and interfaces required for realizing control of image scanning, display, and the like in the shielded room.
  • the signal processing module 20 is connected to the signal transmission line 22 connected to other electronic devices in the shielding room, such as the display 116, to the signal filter 21, at the power source.
  • the power transmission line 19 connected to the outside by the conversion module 20 is connected to the power source filter 17.
  • the size and impedance of the interference can be carried according to the working frequency band, voltage and current, and the form and parameters of the filter can be determined.
  • the magnetic loop 18 can be further suppressed on the signal transmission line 22 and the power transmission line 19 to further suppress interference.
  • the magnetic ring 18 is mainly used to suppress common mode interference.
  • the interference can be further absorbed by shielding, thereby achieving further suppression of electromagnetic interference.
  • the magnetic resonance imaging apparatus of the present invention by placing an interference source board, that is, a shielded room control board 110, in the electromagnetic interference suppression apparatus 119, since the electromagnetic interference suppression apparatus includes a shield box that houses the control board, Most of the electromagnetic interference will be suppressed, and the conductive metal plate fixed at the bottom of the control board forms a low-impedance current loop, so that the interference of the MRI signal when the control board is working is further reduced, so that it can be set in the shielding room, such as described in the embodiment.
  • the imaging control system such as the shielded room control system allows the operator to implement complex imaging control in the shielded room to facilitate the operation of the MRI device.
  • the core control board of the shielded indoor display 116 may also be configured with an electromagnetic interference shielding device similar to that of the previous embodiment; the entire magnetic resonance imaging apparatus may include only one console system computer, and the The console computer is connected to both the console and the shielded indoor display; in the MRI device, the control system can also be set only in the shielded room, and the console system can be cancelled.

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Description

电磁干扰抑制装置及采用该装置的磁共振成像设备 技术领域
本发明涉及一种电磁干扰抑制装置及采用该装置的磁共振成像设备。
 背景技术
磁共振成像（Magnetic Resonance Imaging, MRI）是现代医疗影像学中主要的成像方式之一。它是断层成像的一种，对软组织分辨率高，对人体无放射性损害。磁共振成像的基本工作原理是利用磁共振现象从人体中获得电磁信号,并重建出人体信息。氢质子在静磁场下分为两个能级，在射频激发下，氢质子就会从低能级跃迁到高能级，撤除射频脉冲，氢质子就会从高能级跃迁回低能级，同时发射出射频能量，这个射频能量会被MRI的接收线圈接收到，经过处理成为MRI图像。
常见的MRI设备主要包括主磁体、梯度线圈、射频线圈、梯度功放、射频功放、序列控制系统、控制台计算机以及屏蔽室内交互控制系统。其中主磁体用于提供均匀的基本磁场，梯度线圈用于提供随位置变化的磁场，以便分辨不同的空间位置，射频线圈用于发射激发脉冲和接收MRI信号。由于MRI射频线圈所接收到的信号通常很微弱，系统中各类电子部件，比如CPU、直流电源转换电路等正常工作时发出的泄漏电磁波，都会对图像信号造成严重干扰，甚至将MRI信号淹没。所以主磁体、梯度线圈、射频线圈等前端部件都放在一个特制的大屏蔽室内，而主要的控制部件，如梯度功放、射频功放、序列控制系统、控制台计算机放在与屏蔽室隔离的控制室或者设备室中，屏蔽室只能放置一些结构简单、运行速度低的控制部件组成交互控制系统，造成屏蔽室内控制方式单一，无法实现复杂的控制，这就带来一系列问题，比如医生只能在屏蔽室外进行主要的图像操作，通过屏蔽室与控制室之间的透明隔板观察病人，在此期间无法很好的与病人交流或者根据情况及时变换病人摆位，即使医生在屏蔽室内工作的时候，只能在屏蔽室内看到一些由小点阵显示屏或段码式显示屏显示的简单提示信息，要观察扫描图像仍然要回到控制内，造成图像扫描过程极不方便。
 技术问题
为了解决现有技术中磁共振成像设备在屏蔽室内的控制方式单一的技术问题，有必要提供一种能在屏蔽室内实现复杂控制的电磁干扰抑制装置。
同时，也有必要提供一种使用该电磁干扰抑制装置的磁共振成像设备。
 技术解决方案
一种电磁干扰抑制装置，其包括一屏蔽盒及一导电板，该屏蔽盒包括多个屏蔽板，该多个屏蔽板围成一屏蔽空间，该导电板收容于该屏蔽空间并固定在该屏蔽盒的屏蔽板上，该导电板用于承载产生电磁干扰的干扰源板卡。
一种磁共振成像设备，其包括放置在屏蔽室内的主磁体、梯度线圈和射频线圈、一控制系统及一电磁干扰抑制装置，该控制系统及该电磁干扰抑制装置设置于该屏蔽室内，该控制系统包括一控制板卡，该控制板卡固定并收容于该电磁干扰抑制装置，该电磁干扰抑制装置包括一屏蔽盒及一导电板，该屏蔽盒包括多个屏蔽板，该多个屏蔽板围成一屏蔽空间，该导电板收容于该屏蔽空间并固定在该屏蔽盒的屏蔽板上，该控制板卡固定于该导电板上。
本发明实施方式所提供的电磁干扰抑制装置及采用此装置的磁共振成像设备，其通过屏蔽盒将设备中对MRI信号产生电磁干扰的控制板卡收容于其中，降低电磁干扰，并用导电板将控制板卡固定在屏蔽盒上，导电板形成一个低阻抗电流回路，进一步降低控制板卡对MRI信号产生的电磁干扰，从而可以在屏蔽室内设置诸如实施方式中描述的屏蔽室控制系统之类的成像控制系统，使得操作者可以在屏蔽室内实现复杂的成像控制，便于MRI设备的操作。
 附图说明
图1是本发明一较佳实施方式的磁共振成像设备的系统框图；
图2是本发明一较佳实施方式的电磁干扰抑制装置的结构示意图。
 本发明的实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。
请参看图1，是本发明一较佳实施方式的磁共振成像设备(以下简称为MRI设备)的系统框图。该MRI设备1包括主磁体100、梯度线圈102、射频线圈104、以屏蔽室控制板卡110为中心的屏蔽室控制系统、控制台系统150、病床及病床控制系统130、序列控制系统120、发射通道172、接收通道170、射频功放180以及梯度功放182。其中主磁体100为成像提供均匀的基本磁场，梯度线圈102提供随位置变化的磁场，以便分辨不同的空间位置。射频线圈104包括发射线圈和接收线圈。序列控制系统120用于输出设备所需的各类控制序列。屏蔽室控制系统还包括与屏蔽室控制板卡相连接的控制输入设备112、触摸屏114、显示器116以及生理门控118。控制台系统150由PC机或者工控机构成。其中，主磁体100、梯度线圈102、射频线圈104、以屏蔽室控制板卡110为中心的屏蔽室控制系统、发射通道172、接收通道170以及病床及病床控制系统130放置在与周围实行电磁屏蔽的MRI屏蔽室内。序列控制系统120、射频功放180以及梯度功放182放置在MRI设备室中。而控制台系统150放置在普通的控制室中即可。序列控制系统120与屏蔽室控制板卡110之间、屏蔽室控制板卡110与控制台系统150之间均采用光纤通信方式连接。序列控制系统120与控制台系统之间则采用常规的数据传输连接。
在信号发射期间，序列控制系统120在控制台系统150或者屏蔽室控制系统的控制下输出满足共振条件的射频信号，射频信号经射频功放180进行功率放大，放大后的射频信号经发射通道172由射频线圈104中的发射线圈发射至成像目标，以此激发成像目标产生核磁共振。在信号采集过程中，射频线圈104的接受线圈感应得到MRI信号，MRI信号经过接收通道170和序列控制系统120接收并进行前置放大、混频、模/数转换等处理后输入到控制台系统150或者屏蔽室控制板卡110。同时，序列控制系统120发出梯度控制信号，经梯度功放182进行功率放大后输出到梯度线圈102，梯度线圈102产生梯度磁场，对MRI信号进行空间定位的作用。如此，MRI信号经控制台系统150或者屏蔽室控制板卡110处理得到成像目标的MRI图像，并通过控制台系统150中的显示器件或者显示器116直观显示给操作者。同时，也可以将图像信息存储以备需要的时候调用。
在本实施方式中，操作者可以在屏蔽室外通过控制台系统150对MRI成像进行控制及观察。同时，屏蔽室控制系统通过屏蔽室控制板卡110也可以对MRI信号的采集以及图像处理进行相似的控制，从而使得操作者也可以在屏蔽室内通过屏蔽室控制系统对成像进行控制。其中屏蔽室控制板卡110所配备的控制输入设备112可以是按键、轨迹球、键盘等。屏蔽室控制系统还可以包括触摸屏114，直接通过触摸屏114输入控制信号并显示MRI图像。还可以接入大屏幕的显示器116显示图像，方便操作者观察，比如液晶显示器。本实施方式中，屏蔽室控制板卡110除了可以进行成像控制外，还与病床及病床控制系统130相连接，对病床的移动进行控制。另外，通过对生理门控118的控制，比如心电门控，可以把心电信息融合到MRI信号中，减少运动伪像，或者可以用电影方式观察心动周期中各房室的舒张收缩情况。在本实施方式中，屏蔽室控制板卡110的控制板配置了本发明的电磁干扰抑制装置119，使得控制板卡上的电子元件发出的干扰信号被屏蔽掉，以确保对MRI信号不产生干扰。
在本发明的其他一些实施方式中，进行信号采集、处理的也可以只是屏蔽室控制系统，而控制台系统150通过与屏蔽室控制系统的通信对MRI成像进行控制。在另外一些实施方式中，只有控制台系统150可以对MRI信号进行采集处理，而屏蔽室控制系统通过与控制台系统150之间的通信进行数据及控制信号传输，实现对MRI成像的控制或者只是接收控制台系统150传输过来的MRI图像信息，方便医生在屏蔽室内进行图像观察。实际使用中可以根据需要进行设定，并不限于上述这些方式。
在本实施方式中，控制台系统屏蔽室控制系统可以采用TCP/IP协议的以太网通信，控制台系统通过光纤通信与屏蔽室控制系统相连。控制台系统与屏蔽室控制系统都可以对MRI信号的采集以及图像处理进行控制。在另外的实施方式中，也可以设置一个选择开关，用于选择屏蔽室控制系统或者控制台系统的运行。
请参看图2，是本发明一较佳实施方式的电磁干扰抑制装置的结构示意图。因为屏蔽室控制系统的控制板卡110是对MRI信号产生干扰的主要部件，所以本实施方式中的电磁干扰抑制装置主要是针对该控制板卡110而设置，在本发明中，控制板卡是作为一种示例的干扰源板卡。同样的，针对其他类似电子装置中的干扰源板卡，可以为其设计类似的电磁干扰抑制装置。该控制板卡110是屏蔽室控制系统中承担控制功能的板卡，以中央处理器（CPU）或者现场可编程门阵列（FPGA）为核心，配有内置或者外置的存储器、逻辑器件、总线器件和各类外设及I/O。例如该主控制电路板可以是x86的工控机板卡，其包括CPU、北桥（驱动内存）、内存、南桥（驱动PCI总线，提供多功能I/O）、显示控制器件等部件。又例如该控制板卡110可以是以FPGA为核心的控制系统，可以内嵌有CPU软核，FPGA可以生成各类的外设，配以存储器和驱动器件，形成一套完整的控制系统板卡。
如图2所示，该控制板卡110通过螺钉14固定在导电板11，该导电板11则通过螺钉13固定在屏蔽盒10的一个屏蔽板上，导电板11与屏蔽盒10均接地。图中并未绘出完整的屏蔽盒外形，但是对于本领域技术人员来说，可以理解屏蔽盒是一个封闭的立体结构，其可以是长方体、柱体等结构，可以根据实际情况选择合适的形状。在本实施方式中，屏蔽盒由金属制成，比如铜，铝，铝合金。导电板由金属制成，或者合金等导电性能良好的材料，金属优选的可以是铜或铝。导电板接地通过螺钉连接金属板，金属板成为一个低阻抗电流回路，降低了控制板卡110本身对外的干扰。
控制板卡110包括了实现屏蔽室内图像扫描、显示等控制所需要的处理、驱动、接口等电子部件。在本实施方式中，为了进一步降低控制板卡110对MRI信号的干扰，在信号处理模块20与屏蔽室内其他电子装置，比如显示器116相连接的信号传输线22上接入信号滤波器21，在电源转换模块20与外界连接的电源传输线19接入电源滤波器17。可以根据工作频段、电压、电流的大小，携带干扰的大小及阻抗，决定滤波器的形式及参数。基于上述实施方式，可以进一步在信号传输线22以及电源传输线19上套磁环18进一步的抑制干扰。磁环18主要用于抑制共模干扰。另外对于信号传输线22和电源传输线19，可以通过屏蔽的方式将干扰进一步的吸收，从而达到更进一步的抑制电磁干扰。
本发明的磁共振成像设备，通过将干扰源板卡即屏蔽室控制板卡110放置在所述的电磁干扰抑制装置119中，由于电磁干扰抑制装置包括将控制板卡收容起来的屏蔽盒，其将抑制大部分的电磁干扰，而控制板卡底部固定的导电金属板形成一个低阻抗电流回路，使得控制板卡工作时对MRI信号的干扰进一步降低，从而可以在屏蔽室内设置诸如实施方式中描述的屏蔽室控制系统之类的成像控制系统，使得操作者可以在屏蔽室内实现复杂的成像控制，便于MRI设备的操作。
在其他的一些实施方式中，屏蔽室内显示器116的核心控制板卡也可以配置一个与前述实施方式中类似的电磁干扰屏蔽装置；整个磁共振成像设备可以仅包括一台控制台系统计算机，而该控制台计算机同时连接控制台与屏蔽室内两台显示器；MRI设备中也可以只在屏蔽室内设置控制系统，而取消控制台系统。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明的保护范围。

Claims (15)

  1. 一种电磁干扰抑制装置，其特征在于：其包括一屏蔽盒及一导电板，该屏蔽盒包括多个屏蔽板，该多个屏蔽板围成一屏蔽空间，该导电板收容于该屏蔽空间并固定在该屏蔽盒的屏蔽板上，该导电板用于承载产生电磁干扰的干扰源板卡。
  2. 如权利要求1所述的电磁干扰抑制装置，其特征在于：所述导电板是金属板。
  3. 如权利要求1或2所述的电磁干扰抑制装置，其特征在于：所述导电板通过金属螺钉固定在屏蔽盒上。
  4. 如权利要求1或2所述的电磁干扰抑制装置，其特征在于：该屏蔽盒进一步包括多个导电片或者导电海绵，该导电片或者导电海绵搭接在相邻的两个屏蔽板之间。
  5. 如权利要求1所述的电磁干扰抑制装置，其特征在于：干扰源板卡通过金属螺钉固定于导电板。
  6. 如权利要求1、2、3或者5所述的电磁干扰抑制装置，其特征在于：所述干扰源板卡通过导线与屏蔽盒外的电子装置进行信号或者能量传输，该信号线上套有抑制共模干扰的磁环。
  7. 如权利要求6所述的电磁干扰抑制装置，其特征在于：所述导线是屏蔽导线。
  8. 一种磁共振成像设备，其包括放置在屏蔽室内的主磁体、梯度线圈和射频线圈，其特征在于：该磁共振成像设备进一步包括一控制系统及一电磁干扰抑制装置，该控制系统及该电磁干扰抑制装置设置于该屏蔽室内，该控制系统包括一控制板卡，该控制板卡固定并收容于该电磁干扰抑制装置，该电磁干扰抑制装置包括一屏蔽盒及一导电板，该屏蔽盒包括多个屏蔽板，该多个屏蔽板围成一屏蔽空间，该导电板收容于该屏蔽空间并固定在该屏蔽盒的屏蔽板上，该控制板卡固定于该导电板上。
  9. 如权利要求8所述的磁共振成像设备，其特征在于：该屏蔽盒进一步包括多个导电片或导电海绵，该导电片或导电海绵搭接在相邻的两个屏蔽板之间。
  10. 如权利要求8或9所述的磁共振成像设备，其特征在于：所述导电板和屏蔽盒由金属制成。
  11. 如权利要求8或9所述的磁共振成像设备，其特征在于：所述控制板卡通过螺钉固定在导电板上。
  12. 如权利要求11所述的磁共振成像设备，其特征在于：所述导电板通过螺钉固定在屏蔽板上。
  13. 如权利要求8或者9所述的磁共振成像设备，其特征在于：所述控制系统进一步包括一液晶显示器，该液晶显示器与控制板卡相连。
  14. 如权利要求8或者9所述的磁共振成像设备，其特征在于：所述控制系统进一步包括一触摸控制屏，该触摸控制屏与控制板卡相连。
  15. 如权利要求8或9所述的磁共振成像设备，其特征在于：进一步包括一设置在屏蔽室外的第二控制系统，其与屏蔽室内的控制系统通过光纤通信连接。
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CN102445675B (zh) 2016-04-27

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