GE磁共振简称.docx
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GE磁共振简称.docx
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GE磁共振简称
Glossary
ACGD
AdvancedConceptGradientDriver
AGP
ApplicationsGatewayProcessor[Board]
AP
ArrayProcessorBoard
APM
AnalogPowerMonitor[Board]
APS
Autoprescan:
Auto-adjustmentofdataacquisition(scan)parameters
APS
AcquisitionProcessingSystem[Board]
AVS
Autovoxelshim
AWS
AutomaticWaterSuppression
BRM
BodyResonanceModule
BRM
BodyResonanceModule
CAN
ControlAreaNetwork[Board]
CCC
CANCoreCommunication[Board]
CRM
CardiacResonanceModule
CRT
CathodeRayTube
CRYOGEN
Asubstanceforproducinglowtemperatures.Liquidheliumisthecryogenusedtocoolthemagnettoapproximately4Kelvin(269Cor452F).
CRYOSTAT
Anapparatusmaintainingaverylowconstanttemperature.Thecryostatconsistsofoneconcentric,cylindricalcontainerhousedinanoutervacuumtightvessel.Themagnetandshimcoilsaremountedintheinnercontainer.Thecontainerisfilledwithliquidhelium.Theshieldssurroundingtheinnercontainerarekeptcoldbyarefrigerationdevice.
CV
Controlvariable
DCB
DriverControlBoard
DEWAR
Acontainerwithanevacuatedspacebetweentwohighlyreflectivewallsusedtokeeplowtemperaturesubstancesatnearconstanttemperatures.Liquidheliumisusuallystoredandshippedindewars
DM
DriverModule
DRF1
DigitalReceiveFilter1[Board]
DSP
DigitalSignalProcessing
EXCLUSIONZONE
Areawherethemagneticfluxdensityisgreaterthanfivegauss.Personnelwithcardiacpacemakers,neurostimulatorsandotherbiostimulationdevicesmustNOTenterthiszone.Signsarepostedoutsidethefivegausslinealertingpersonnelofthisrequirement.Sincethemagneticfieldisthreedimensional,signsarealsopostedonfloorsaboveandbelowtheMagnetRoominwhichthefivegausslineexists.
FERROUSMATERIAL
Anysubstancecontainingironwhichisstronglyattractedbyamagneticfield.
FO
FiberOptic
FOV
FieldofView
FPIO
FrontPanelInput/Output[Board]
FWHM
FullWidthHalfMax
GAUSS(G)
Aunitofmagneticfluxdensity.Theearthsmagneticfieldstrengthisapproximatelyonehalfgausstoonegaussdependingonlocation.Theinternationallyacceptedunitisthetesla(1Tesla=10,000Gand1milliTesla=10G).
GP
GradientProcessor[Board]
GRADIENT
Theamountanddirectionoftherateofchangeinspaceofthemagneticfieldstrength.Inthemagneticresonancesystem,gradientamplifiersandcoilsareusedtovarythemagneticfieldstrengthinthex,y,andzplanes.
GRx
GraphicPrescription
HFA
HighFidelityGradientAmplifier
HFD
HighFidelityGradientDriver
HOMOGENEITY
Uniformity.Thehomogeneityofthestaticmagneticfieldisanimportantqualityofthemagnet.
ICN
ImageComputeNode. Acomponentwithaninternaloperatingsystem(similartoaPC)usedforImagereconstructionintheVRE. Containsharddrivesandanoperatingsystem
ICW
InstallationCalibrationWizard. Thiswizardisavailableintwodifferentmodes:
InstallandUpgrades. ItcanbefoundintheproprietaryCommonServiceDesktopunderthe"Calibration"tab. Maintenancemodeisavailableafterallcalibrationsandtasksintheinstallmodearecomplete.
IFCC
Imageandcleanup
INFINIBAND
High-speedcommunication,analogoustoEthernetbutmuchhigherspeedandcapacity. Usedfortransportinglargeamountsofdataforwithinthevolumereconstructionsubsystem
IRF
InterfaceandRemoteFunctions[Board]
IRFI/O
InterfaceandRemoteFunctionsInput/Output[Board]
ISOCENTER
Centeroftheimagingvolumeideallylocatedatthemagnetcenter.
ISOGAUSSLINE
Animaginarylineoralineonafieldplotconnectingidenticalmagneticfieldstrengthpoints.
ITHost
ImageTransferHost[Board]
IT-MGD
ImageTransfer-MGD[Board]
LCD
LiquidCrystalDisplay
LED
LightEmittingDiode
LO
LocalOscillator
LPCA
LowProAssembly
MAGNETICFIELD(H)
Thespacearoundamagnet(orcurrentcarryingconductor)whichcanproduceamagnetizingforceonabodywithinit
MAGNETICRESONANCE(MR)
Theabsorptionoremissionofelectromagneticenergybynucleiinastaticmagneticfield,afterexcitationbyasuitableradiofrequencyfield.
MAGNETICSHIELDING
Usingmaterial(e.g.steel)toredistributeamagneticfield,usuallytoreducefringefields.
MC
MultiCoil
MCD
MultiCoilDriver[Board]
MCQA
MultiCoilQualityAssurance. ThisisatoolthatwillcheckthecoilSNRandbeabletotrenditforeachcoilovertime.
MGD
Multi-GenerationalDataacquisition[Chassis]
MPS
Manualprescan:
Manualadjustmentofdataacquisition(scan)parameters
MRS
MagneticResonanceSpectroscopy
MUX
Multiplexor[Board]
NEX
Numberofexcitations
OM
OxygenMonitor
OW
OperatorWorkspace
PAC
PhysiologicalAcquisitionController
PCI
PeripheralComponentInterconnect
PDU
PowerDistributionUnit
PMC
PCIMezzanineConnecter
PP
PenetrationPanel
PRESS
Point-resolvedspectroscopy,basisforprobe-pPSD
PROBE/Q
AutomatedanalysisanddisplayofPROBE/SVdata
PROBE/SV
PROtonBrainExamSingleVoxelspectroscopyusingautomatedSTEAMorPRESSpulsesequence
PS
PowerSupply
PSD
Pulsesequencedatabase
PT
PatientTransportorPatientTable
QUENCH
Conditionwhenasuperconductingmagnetbecomesresistivethusrapidlyboilingoffliquidhelium.Themagneticfieldreducesrapidlyafteraquench.
RADIOFREQUENCY(RF)
Frequencyintermediatebetweenaudiofrequencyandinfraredfrequencies.Usedinmagneticresonancesystemstoexcitenucleitoresonance.Typicalfrequencyrangeformagneticresonancesystemsis580Mhz.
RADIOFREQUENCYSHIELDING
Usingmaterial(e.g.copper,aluminium,orsteel)toreduceinterferencefromexternalradiofrequencies.Aradiofrequencyshieldedroomusuallyenclosestheentiremagnetroom.
RECON
ProcessthatcreatesanimageorspectrumfromdataacquiredwithaSignaMRIscanner.
RESONANCE
Alargeamplitudevibrationcausedbyarelativesmallperiodicstimulusofthesameornearlythesameperiodasthenaturalvibrationperiodofthesystem.Inmagneticresonanceimaging,theradiofrequencypulsesaretheperiodicstimuliwhichareatthesamevibrationperiodasthehydrogennucleibeingimaged.
RF
RadioFrequency
RF-DIF
RF-DigitalInterface[Board]
RFI
RFInterface[Module]
ROI
RegionofInterest
RPC
RemoteControlPanel(TwinSpeedonly)
RRF
RemoteRF[Chassis]
RSP
Real-timesequencecontrolparameters
S/C
SuperConducting
SAT
Saturation,asignalsuppressiontechnique
SCP
ScanControlProcessor[Board]
SCSI
SmallComputerSystemInterface
SGA
SwitchableGradientAmplifier[Module]
SHIELDCOOLERCOLDHEAD
Anexternalrefrigerationdevicewhichmaintainstheshieldsinsidethecryostatataconstanttemperature.
SHIMCOILS
Shimcoilsareusedtoprovideauxiliarymagneticfieldsinordertocompensateforinhomogeneitiesinthemainmagneticfieldduetoimperfectionsinthemanufacturingofthemagnetoraffectsofsteelinthesurroundingenvironment.
SHIMMING
Correctionofinhomogeneityofthemainmagneticfieldduetoimperfectionsinthemagnetortothepresenceofexternalferromagneticobjects.
SMC
SystemMonitorandControl
SPU
SignalProcessingUnit
SRF
ScalableRF[Cabinet](thisissameasSRFD)
SRF/TRF
SequencerRelatedFunction/TriggerandRotationFunction[Board]
SRFD
ScalableRFDriver[Cabinet]
SRFD2
ScalableRFDriver2[Cabinet]
SRI
ScanRoomInterface[Module]
SSM
SystemSupportModule
STEAM
Stimulatedechoacquisitionmode,basisforPROBE-sPSD
STIF
SRF/TRFInterface[Board]
SUPERCONDUCTINGMAGNET
Amagnetwhosemagneticfieldoriginatesfromcurrentflowingthroughasuperconductor.Suchamagnetisenclosedinacryostat.
SUPERCONDUCTOR
AsubstancewhoseelectricalresistanceessentiallydisappearsattemperaturesnearzeroKelvin.Acommonlyusedsuperconductorinmagneticresonanceimagingsystemmagnetsisniobiumtitaniumembeddedinacoppermatrix
T1
ThecharacteristictimeconstantforthemagnetizationsreturntothelongitudinalaxisafterbeingexcitedbyanRFpulse.AlsocalledSpinLatticeorLongitudinalRelaxationTime.
T1-Weighted
ScanprotocolsthatallowtheT1effectstopredominateovertheotherrelaxationeffects.
T2*
ThecharacteristictimeconstantforlossoftransversemagnetizationandMRsignalduetoT2andlocalfieldinhomogeneties.Sincesuchinhomogeneitiesarenotcompensatedforbygradientreversal,contrastingradient-echoimagesdependsonT2*.
T2*-Weighted
ScanprotocolsthatallowtheT2*effectstopredominateovertheothercontrasteffects.TherearethreeprimarygradientechopulsesequencesthatcanbeusedtoproducevaryingT2*-weightedimages:
GradientEcho,SPGR,andSSFP.
T2
Thecharacteristictimeconstantforlossofphasecoherenceamongspins,causedbytheirinteraction,andtheresultinglossinthetransverse-magnetizationMRsignal.AlsoreferredtoasSpin-SpinorTransverseRelaxationTime.
T2-Weighted
ScanprotocolsthatallowtheT2effectstopredominateovertheothercontrasteffects.
TEMin
TheshortestpossibleTEtimeforagivenprescription,usedtominimizeflowdephasingandT2effects.
TE
SeeTimetoEcho.
TE1
ThetimefromthemiddleofthefirstexcitationpulsetothemiddleofthefirstreadoutinanAsysmmetricalSpinEchopulsesequence.
TAC
TwinAccessoryCabinet(TwinSpeedonly)
TE
Echotime
TE2
ThetimebetweenthemiddleofthefirstexcitationpulseandthemiddleofthesecondreadoutinanAsysmmetricalSpinEchopulsesequence.
TESLA(T)
Theinternationallyacceptedunitofmagneti
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