GE磁共振簡(jiǎn)稱

1、GlossaryACGDAdvanced Concept Gradient DriverAGPApplications Gateway Processor BoardAPArray Processor BoardAPMAnalog Power Monitor BoardAPSAuto prescan: Auto-adjustment of data acquisition (scan) parametersAPSAcquisition Processing System BoardAVSAuto voxel shimAWSAutomatic Water SuppressionBRMBody R

2、esonance ModuleBRMBody Resonance ModuleCANControl Area Network BoardCCCCAN Core Communication BoardCRMCardiac Resonance ModuleCRTCathode Ray TubeCRYOGENA substance for producing low temperatures. Liquid helium is the cryogen used to cool the magnet to approximately 4 Kelvin (269 C or 452 F).CRYOSTAT

3、An apparatus maintaining a very low constant temperature.The cryostat consists of one concentric, cylindricalcontainer housed in an outer vacuum tight vessel. The magnet and shim coils are mounted in the inner container. The container is f川ed with liquid helium. The shields surrounding the inner con

4、tainer are kept cold by a refrigeration device.CVControl variableDCBDriver Control BoardDEWARA container with an evacuated space between two highly reflective walls used to keep low temperature substances at nearconstant temperatures. Liquid helium is usually stored and shipped in dewarsDMDriver Mod

5、uleDRF1Digital Receive Filter 1 BoardDSPDigital Signal ProcessingEXCLUSION ZONEArea where the magnetic flux density is greater than five gauss. Personnel with cardiac pacemakers, neurostimulators and other biostimulation devices must NOT enter this zone. Signs are posted outside the five gauss line

6、alerting personnel of this requirement. Since the magnetic field is threedimensional, signs are also posted on floors above and below the Magnet Roomin which the five gauss line exists.FERROUS MATERIAAny substance containing iron which is strongly attractedby a magnetic field.FOFiber OpticFOVField o

7、f ViewFPIOFront Panel Input/Output BoardFWHMFull Width Half MaxGAUSS (G)A unit of magnetic flux density. The earths magnetic field strength is approximately one half gauss to one gauss depending on location. The internationally accepted unit is the tesla (1 Tesla = 10,000G and 1 milli Tesla =10G).GP

8、Gradient Processor BoardGRADIENTThe amount and direction of the rate of change in space of the magnetic field strength. In the magnetic resonance system, gradient amplifiers and coils are used to vary the magnetic field strength in the x, y, and z planes.GRxGraphic PrescriptionHFAHigh Fidelity Gradi

9、ent AmplifierHFDHigh Fidelity Gradient DriverHOMOGENEITYUniformity. The homogeneity of the static magnetic field is an important quality of the magnet.ICNImage Compute Node. A component with an internal operating system (similar to a PC) used for Image reconstruction in the VRE.Contains hard drives

10、and anoperating systemICWInstallation Calibration Wizard.This wizard isavailable in two different modes: Install andUpgrades. It can be found in the proprietary Common Service Desktop under the Calibration tab. Maintenance mode is available after all calibrations and tasks in the install mode are co

11、mplete.IFCCImage and cleanupINFINIBANDHigh-speed communication, analogous to Ethernet but much higher speed and capacity.Used for transporting largeamounts of data for within the volume reconstruction subsystemIRFInterface and Remote Functions BoardIRF I/OInterface and Remote Functions Input/Output

12、BoardISOCENTERCenter of the imaging volume ideally located at the magnet center.ISOGAUSS LINEAn imaginary line or a line on a field plot connecting identical magnetic field strength points.IT HostImage Transfer Host BoardIT-MGDImage Transfer-MGD BoardLCDLiquid Crystal DisplayLEDLight Emitting DiodeL

13、OLocal OscillatorLPCALow Pro AssemblyMAGNETIC FIELD(H)The space around a magnet (or current carrying conductor) which can produce a magnetizing force on a body within itMAGNETICRESONANCE (MR)The absorption or emission of electromagnetic energy by nuclei in a static magnetic field, after excitation b

14、y a suitable radio frequency field.MAGNETICSHIELDINGUsing material (e.g. steel) to redistribute a magnetic field , usually to reduce fringe fields.MCMultiCoilMCDMultiCoil Driver BoardMCQAMulti Coil Quality Assurance.This is a tool that willcheck the coil SNR and be able to trend it for each coil ove

15、r time.MGDMulti-Generational Data acquisition ChassisMPSManual prescan: Manual adjustment of data acquisition(scan) parametersMRSMagnetic Resonance SpectroscopyMUXMultiplexor BoardNEXNumber of excitationsOMOxygen MonitorOWOperator WorkspacePACPhysiological Acquisition ControllerPCIPeripheral Compone

16、nt InterconnectPDUPower Distribution UnitPMCPCI Mezzanine ConnecterPPPenetration PanelPRESSPoint-resolved spectroscopy, basis for probe-p PSDPROBE/QAutomated analysis and display of PROBE/SV dataPROBE/SVPROton Brain Exam Single Voxel spectroscopy usingautomated STEAM or PRESS pulse sequencePSPower S

17、upplyPSDPulse sequence data basePTPatient Transport or Patient TableQUENCHCondition when a superconducting magnet becomesresistive thus rapidly boiling off liquid helium. The magnetic field reduces rapidly after a quench.RADIO FREQUENCE(RF)Frequency intermediate between audio frequency andHnfrared f

18、requencies. Used in magnetic resonance systems to excite nuclei to resonance. Typical frequency range for magnetic resonance systems is 580 Mhz.RADIO FREQUENCESHIELDINGUsing material (e.g. copper, aluminium, or steel) to reduce interference from external radio frequencies. A radio frequency shielded

19、 room usually encloses the entire magnet room.RECONProcess that creates an image or spectrum from data acquired with a Signa MRI scanner.RESONANCEA large amplitude vibration caused by a relative small periodic stimulus of the sameor nearly the sameperiod as the natural vibration period of the system

20、. In magnetic resonance imaging, the radio frequency pulses are the periodic stimuli which are at the same vibration period as the hydrogen nuclei being imaged.RFRadio FrequencyRF-DIFRF-Digital Interface BoardRFIRF Interface ModuleROIRegion of InterestRPCRemote Control Panel (TwinSpeed only)RRFRemot

21、e RF ChassisRSPReal-time sequence control parametersS/CSuper ConductingSATSaturation, a signal suppression techniqueSCPScan Control Processor BoardSCSISmall Computer System InterfaceSGASwitchable Gradient Amplifier ModuleSHIELD COOLERCOLD HEADAn external refrigeration device which maintains the shie

22、lds inside the cryostat at a constant temperature.SHIM COILSShim coils are used to provide auxiliary magnetic fields in order to compensate for inhomogeneities in the mainmagnetic field due to imperfections in the manufacturing of the magnet or affects of steel in the surrounding environment.SHIMMIN

23、GCorrection of inhomogeneity of the main magnetic field due to imperfections in the magnet or to the presence of external ferromagnetic objects.SMCSystem Monitor and ControlSPUSignal Processing UnitSRFScalable RF Cabinet (this is same as SRFD)SRF/TRFSequencer Related Function / Trigger and Rotation

24、FunctionBoardSRFDScalable RF Driver CabinetSRFD2Scalable RF Driver 2 CabinetSRIScan Room Interface ModuleSSMSystem Support ModuleSTEAMStimulated echo acquisition mode, basis for PROBE-s PSDSTIFSRF/TRF Interface BoardSUPER CONDUCTSMAGNETA magnet whose magnetic field originates from currentUGflowing t

25、hrough a superconductor. Such a magnet is enclosedin a cryostat.SUPERCONDUCTOA substance whose electrical resistance essentially Rdisappears at temperatures near zero Kelvin. A commonlyT2-WeightedScan protocols that allow the T2 effects to predominate over the other contrast effects.TE MinThe shorte

26、st possible TE time for a given prescription, used to minimize flow dephasing and T2 effects.TESee Time to Echo.TE1The time from the middle of the first excitation pulse to the middle of the first readout in an Asysmmetrical Spin Echo pulse sequence.TACTwin Accessory Cabinet (TwinSpeed only)TEEcho t

27、imeTE2The time between the middle of the first excitation pulseand the middle of the second readout in an AsysmmetricalSpin Echo pulse sequence.TESLA (T)The internationally accepted unit of magnetic flux density. Onetesla is equal to 10,000 gauss. Onemilli Tesla is equal to 10 gauss.TGWCTwinSpeed Gradient Water CoolerTime to Echo (TE)The time between the center of the excitation pulse and the peak of