MRI-技术发展水平

MRI:StateoftheArtMRAttractionsMRI的特點非侵入性MRCPMRMyelography無輻射任意斷層切面組織對比T2信號抑制MR血管攝影NoCMNecessaryReplacingDiganosticAngioVasculaturesbeyondBrain安全的造影劑最安全健保給付TissueContrastT1,T2&PDTETR25005001590Spin-Echo,GradientEchoSE,TSE&EPISE:7minTSE:2minEPI:0,2sEchoPlanarImagingSingleshotEPIUncooperativepatientsUltra-fastimagingStrokeImagingSeparationofoldversusnewinfarctionsOnlinecalculationofTrace&ADCmapsUpto16b-values:0-4000PerfusionimagingOnlinecalculationofglobalbolusplots,TTPmaps??RestrictionsMagneticFieldSafety:5GaussFringeFieldSuperconductiveMagnet︰Weight,PriceScanTimeKnow-HowLongerTrainingTimeOperationofMRCenterWhatMRIcando?ImagesFunctionsSpectroscopyFunctionalMRIRestrictionsofMedicalImagingLesionDetectionFunctionIndicators︰Example--GPT、GOTCardiacFunction–MyocardialPerfusionBrainFunction–Diffusion&PerfusionImages＋FunctionalStudiesfunctionalMRIFunctionalMRImagingT2WTSET2WFLAIRDWISE-EPIrCBVpostGdT1WSEPCA-angioSpectroscopyImagesvsSpectraOrgansTissuesCellsMoleculesActiveMetabolismonTumorUnusualConcentrationMetabolitesTumorPhasingRadiotherapyfollow-upBrainTumorImages＋SpectroscopyMRImagingPixelVoxelFromPixeltoImagesMRSystemComponentsmagnetRFsystem(coils,pre-amp,etc.)GradientsReceivingBandwidthComputerflexibilitySNRspeed1,5T160cmmagnetGradientsystems„Strongerandfaster“RequiredforadvancedapplicationslikeEPIandcontrastenhancedMR-AngioLevelofperipheralnerveandmusclestimulationisreached.Searchingforcompromisesregardingamplitude,risetime,FoV,linearity.GradientAmplifier•Voltage:max.2000V•Current:max.500Aperaxis(1MW/axis)Amplitude:40mT/mSlewRate:200T/m/sRiseTime:200sMax.40cmFOVRFAmplifier•15kWPulsepower•600Waveragepower•SystemcontrolcompensatesfornonlinearitiesandphaseerrorsRF-CoilsUsingalargernumberoflocalcoils,thes/ncanbeimprovedsignificantlyinperipheralregionsbutnotinthecenterofthepatient.CPBodyArrayandCPSpineArrayCoilCoilCombinationsCoilFamilyBecreative!++==++=++=SequenceFamilySEFISPPSIFCISSDESStrueFISPturboFLASHMPRAGEEPITGSETSEHASTEIRSTEAMSEGRESSFPFLASHQUESTTIRMTGSE3D-FLASHTrue-FISPTurbo-FLASH3D-TOF-AngioPC.AngioKoronarienFlow1H-SVSEPI-Func.ImagingDiffusion-EPI