MRI原理-英文版ppt课件.ppt

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1、MRItheoryandclinicalapplicationWhatisMRI？imagingwithradiofrequencyWhatisthemainadvantageofMRIhighestsofttissueresolutionWhatistheindicationofMRIwholebodyexaminationwherethereissofttissueWhatisfunctionalMRIprovidephysiologicalandpatho-physiologicalinfor

2、mationofinvivotissueThetoptenaffairsinthe20thcentury----AmericanMedicalAssociationMagneticresonanceimaging………………………………The2003NobelPrizeinPhysiologyorMedicinemagneticresonanceimagingTheNobelPrizeinPhysiologyorMedicine2003MRIisoftensuperiortootherimagin

3、gtechniquesandhassignificantlyimproveddiagnosticsinmanydiseases.MRIhasreplacedseveralinvasivemodesofexaminationandtherebyreducedtheriskanddiscomfortformanypatients.Themedicaluseofmagneticresonanceimaginghasdevelopedrapidly.ThefirstMRIequipmentsinhealth

4、wereavailableatthebeginningofthe1980s.In2002,approximately22 000MRIcameraswereinuseworldwide,andmorethan60millionMRIexaminationswereperformed.AgreatadvantagewithMRIisthatitisharmlessaccordingtoallpresentknowledge.Themethoddoesnotuseionizingradiation,in

5、contrasttoordinaryX-ray(NobelPrizeinPhysicsin1901)orcomputertomography(NobelPrizeinPhysiologyorMedicinein1979)examinations.MRimagingImagingwithradiofrequencyMRtechnicalfeaturesAdvantagesHighresolutioninsofttissueObtainmanykindsofinformationinoneexamina

6、tionT1,T2,PD,MRADiffusion,Perfusion,MRS,BOLDDisadvantagesCorticalbone,finecalcification,smallstone,gasContraindicationsPacemakerCase1Case1Case2Case2Case2Case3Case3Case3Case3conventionalMRINow…Fromhead…totoeWhetherlarge……orsmallWheneverand……whateverMRan

7、giographyHeartCoronaryarterystoneMRcholangiopancreatographyfunctionalMRIDiffusionweightedimaingTissueSampleATissueSampleBDiffusionweightedimaingDiffusionWeightedImagingDiffusionTensorImagingPerfusionweightedimaging负性增强图(NEI)rCBV平均通过时间图（MTT）Magneticreso

8、nancespectroscopymagneticresonancespectroscopyppm3.53.02.52.01.5Creatineppm3.53.02.52.01.5citrateCholinecholinecreatinecitrateppm3.53.02.52.01.5AtrophyorNecrosisBenignTissueCancerPriortoTherapy3monthsafterBrachytherapy12monthsafterBrach