GE磁共振简称

1、GE磁共振简称GlossaryACGDAdva need Con cept Gradie nt DriverAGPApplicati ons Gateway Processor BoardAPArray Processor BoardAPMAn alog Power Mo nitor BoardAPSAuto presca n: Auto-adjustme nt of data acquisiti on (sea n) parametersAPSAcquisiti on Process ing System BoardAVSAuto voxel shimAWSAutomatic Water S

2、uppressi onBRMBody Resonance ModuleBRMBody Resonance ModuleCANCon trol Area Network BoardCCCCAN Core Commu nicatio n BoardCRMCardiac Resonance ModuleCRTCathode Ray TubeCRYOGENA substa nee for produc ing low temperatures. Liquid helium is the cryoge n used to cool the mag net to approximately 4 Kelvi

3、n (269 C or 452 F).CRYOSTATAn apparatus mai nta ining a very low con sta nt temperature. The cryostat con sists of one concentric, cylindrical container housed in an outer vacuum tight vessel. The mag net and shim coils are mou nted in the inner contain er. The container is filled with liquid helium

4、. The shields surrou nding the inner container are kept cold by a refrigeration device.CVCon trol variableDCBDriver Con trol BoardDEWARA container with an evacuated space betwee n two highly reflective walls used to keep low temperature substa nces at n earc on sta nt temperatures. Liquid helium is

5、usually stored and shipped in dewarsDMDriver ModuleDRF1Digital Receive Filter 1 BoardDSPDigital Signal Process ingEXCLUSION Z【ONEArea where the magnetic flux density is greater than five gauss. Personnel with cardiac pacemakers, n eurostimulators and other biostimulati on devices must NOT enter this

6、 zone. Signs are posted outside the five gauss line alerting personnel of this requireme nt. Since the magn etic field is threedime nsion al, sig ns are also posted on floors above and below the Magnet Room in which the five gauss line exists.FERROUS MATERIALAny substa nce containing iron which is s

7、tr on gly attracted by a magn etic field.FOFiber OpticFOVField of ViewFPIOFro nt Panel In put/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 depe nding on locati on. The intern ati on ally a

8、ccepted unit is the tesla (1 Tesla = 10,000G and 1 milli Tesla =10G).GPGradie nt Processor BoardGRADIENTThe amou nt and directi on of the rate of cha nge in space of the magn etic fieldstrength. In the magnetic resonance system, gradient amplifiers and coils are used to vary the magnetic field stren

9、gth in the x, y, and z planes.GRxGraphic Prescripti onHFAHigh Fidelity Gradie nt AmplifierHFDHigh Fidelity Gradie nt DriverHOMOGENEITrYUniformity. The homogeneity of the static magnetic field is an important quality of the magn et.CNImage Compute Node.A comp onent with an in ter nal operat ing syste

10、m (similar to aPC) used for Image recon structi on in the VRE.Contains hard drives and anoperati ng systemCWIn stallati on Calibrati on Wizard.This wizard is available in two differe nt modes:In stall and Upgrades.It can be found in the proprietary Com mon Service Desktopunder the Calibration tab.Ma

11、intenance mode is available after all calibrations andtasks in the in stall mode are complete.FCCImage file create and clea nupNFINIBANDHigh-speed commu ni cati on, an alogous to Ether net but much higher speed and capacity.Used for tra nsport ing large amou nts of data for within the volumerecon st

12、ructi on subsystemRFIn terface and Remote Fun cti ons BoardRF I/OIn terface and Remote Fun cti ons In put/Output BoardSOCENTERCen ter of the imagi ng volume ideally located at the magnet cen ter.SOGAUSS LINEAn imaginary line or a line on a field plot connecting identical magnetic field strength poi

13、nts.T HostImage Tran sfer Host BoardT-MGDImage Tran sfer-MGD BoardLCDLiquid Crystal DisplayLEDLight Emitti ng DiodeLOLocal OscillatorLPCALow Profile Carriage AssemblyMAGNETIC FIELD (H)The space arou nd a magn et (or curre nt carry ing con ductor) which can produce a magnetizing force on a body withi

14、n itMAGNETICRESONANCE (MR)The absorpti on or emissi on of electromag netic en ergy by n uclei in a static magn etic field, after excitation by a suitable radio frequency field.MAGNETIC SHIELDINGUsing material (e.g. steel) to redistribute a magnetic field , usually to reduce fringe fields.MCMultiCoil

15、MCDMultiCoil Driver BoardMCQAMulti Coil Quality Assuranee.This is a tool that will check the coil SNR and be ableto trend it for each coil over time.MGDMulti-Ge nerati onal Data acquisiti on ChassisMPSMan ual presca n: Man ual adjustme nt of data acquisiti on (sea n) parametersMRSMagn etic Resonance

16、 SpectroscopyMUXMultiplexor BoardNEXNumber of excitati onsOMOxyge n Mon itorOWOperator WorkspacePACPhysiological Acquisiti on Con trollerPCIPeripheral Comp onent In terc onnectPDUPower Distributi on Un itPMCPCI Mezza nine Co nn ecterPPPen etrati on PanelPRESSPoin t-resolved spectroscopy, basis for p

17、robe-p PSDPROBE/QAutomated an alysis and display of PROBE/SV dataPROBE/SVPROt on Brain Exam Sin gle Voxel spectroscopy usi ng automated STEAM or PRESS pulse seque neePSPower SupplyPSDPulse seque nee data basePTPatie nt Tran sport or Patie nt TableQUENCHCon diti on whe n a superc on duct ing magnet b

18、ecomes resistive thus rapidly boil ing off liquid helium. The magn etic field reduces rapidly after a que nch.RADIO FREQl(RF)JENCYFreque ncy in termediate betwee n audio freque ncy and in frared freque ncies. Used in magn etic resonance systems to excite n uclei to res onan ce. Typical freque ncy ra

19、nge for magn etic resonance systems is 580 Mhz.RADIO FREQlSHIELDINGJENCYUsing material (e.g. copper, aluminium, or steel) to reduce interference from external radio freque ncies. A radio freque ncy shielded room usually en closes the en tire magnet room.RECONProcess that creates an image or spectrum

20、 from data acquired with a Signa MRI sca nner.RESONANCEA large amplitude vibration caused by a relative small periodic stimulus of the same or nearly the same period as the natural vibration period of the system. In magnetic resonance imagi ng, the radio freque ncy pulses are the periodic stimuli wh

21、ich are at the same vibrati on period as the hydroge n n uclei being imaged.RFRadio Freque ncyRF-DIFRF-Digital In terface BoardRFIRF In terface ModuleROIRegi on of In terestRPCRemote Con trol Pan el (Tw in Speed only)RRFRemote RF ChassisRSPReal-time seque nee con trol parametersS/CSuper Con duct ing

22、SATSaturati on, a sig nal suppressi on tech ni queSCPSea n Con trol Processor BoardSCSISmall Computer System In terfaceSGASwitchable Gradient Amplifier ModuleSHIELD COOLERCOLD HEADAn external refrigerati on device which mai ntai ns the shields in side the cryostat at a con sta nt temperature.SHIM CO

23、ILSShim coils are used to provide auxiliary magnetic fields in order to compensate for inhomogeneities in the main magnetic field due to imperfections in the manufacturing of the magnet or affects of steel in the surrou nding en vir onment.SHIMMINGCorrection of inhomogeneity of the main magnetic fie

24、ld due to imperfections in the magnet or to the presence of external ferromagnetic objects.SMCSystem Mon itor and Con trolSPUSignal Process ing UnitSRFScalable RF Cabinet (this is same as SRFD)SRF/TRFSeque ncer Related Fun cti on / Trigger and Rotati on Fun cti on BoardSRFDScalable RF Driver Cabi ne

25、tSRFD2Scalable RF Driver 2 Cabi netSRIScan Room In terface ModuleSSMSystem Support ModuleSTEAMStimulated echo acquisition mode, basis for PROBE-s PSDSTIFSRF/TRF In terface BoardSUPER CONDMAGNETUCTINGA magnet whose magnetic field originates from current flowing through a superc on ductor. Such a magn

26、et is en closed in a cryostat.SUPERCONDUCTORA substa nce whose electrical resista nce esse ntially disappears at temperatures n ear zero Kelvi n. A com monly used superc on ductor in magn etic res onance imagi ng system magnets is niobiumtitanium embedded in a copper matrixT1The characteristic time

27、constant for the magnetizations return to the longitudinal axis after being excited by an RF pulse. Also called Spin Lattice or Longitudinal Relaxati on Time.T1-WeightedScan protocols that allow the T1 effects to predo min ate over the other relaxati on effects.T2*The characteristic time con sta nt

28、for loss of tran sverse magn etizati on and MR sig nal due to T2 and local field inhomogeneties. Since such inhomogeneities are not compe nsated for by gradie nt reversal, con trast in gradie nt-echo images depe nds on T2*.T2*-WeightedSca n protocols that allow the T2* effects to predo min ate over

29、the other con trast effects. There are three primary gradie nt echo pulse seque nces that can be used to produce vary ing T2*-weighted images: Gradie nt Echo, SPGR, and SSFP.T2The characteristic time con sta nt for loss of phase cohere nee among spins, caused by their in teracti on, and the result i

30、ng loss in the tran sverse-mag netizati on MR sig nal. Also referred to as Spin-Sp in or Tran sverse Relaxati on Time.T2-WeightedSca n protocols that allow the T2 effects to predo min ate over the other con trast effects.The shortest possible TE time for a given prescription, used to minimize flowTE

31、 Mindephas ing 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 seque nee.TACTwin Accessory Cabin et (Tw in Speed only)TEEcho timeTE2The time between the middle of the first excitation pulse and the middle of the sec ond readout in an Asysmmetrical Spin Echo pulse seque nee.TESLA (T)The intern ati on ally accepted unit of magn etic flux den sity. One tesla is equal to 10,000 gauss. One milli Tesla is equal to 10 gauss.TGWCTw