最新Magnetic Resonance Imaging - Calvin College - Minds In The …在磁共振成像-加尔文大学的头脑…教学讲义PPT.ppt

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1、MagneticResonanceImaging-CalvinCollege-MindsInThe…在磁共振成像-加尔文大学的头脑…OutlineOverview&HistoryImagingPrinciplesAdvancedTechniquesImagingHardwareSafetyApplicationsOverview&HistoryUsestrongmagneticfieldtoscananobjectandproduceanimageNoradiationUtilizemagnetismofinternalparticles1973–Backproje

2、ctionimagingtechnique1975–Phaseandfrequencyencoding,FourierTransform1977–Imagingofthewholebody,Echo-planarimaging:real-timemovieimaging1993–FunctionalMRIImagingHardwareMagnetsSuperconductingStrongestElectromagnetCurrentflowsinwirecoiltocreateamagneticfieldNearlyzeroresistanceinwireatte

3、mperatureclosetoabsolutezeroCoolingachievedwithliquidheliumornitrogenResistiveElectromagnetCooledbyairGreaterresistanceWeakermagneticfieldPermanentSolidmagneticmaterialWeakestmagneticfieldUsedforopenMRscannersArrangedinanypositionNoneedforpatienttobesurroundedbymagnetCoilsInductive&cap

4、acitiveelementsallowittoresonateGradientcoilsCreategradientsinequilibriummagneticfieldsRoomtemperaturecoilsRFcoilsTransmitmagneticfieldReceiveRFsignalfromspinsVariouscoilsforspecificapplicationsSurfaceBirdcageSaddlePhased-arrayLitzSafetyPatientsNobiologicalhazardsfrommagneticfieldsyetd

5、iscoveredMostpregnantwomenprohibitedfromundergoingMRimagingtopreventpossibledamagetofetusMostpeoplewithmetalimplantsprohibitedPacemakers-malfunctionduetomagnetCerebralaneurysmclip-magnetcouldmoveclipMostorthopedicimplantssafebecausetheyarefirmlyembeddedinboneRFcoilfailurecanseverelybur

6、npatientEquipmentExtremelypowerfulmagnetsNoferromagneticobjectsallowednearscannerExampleBucketpulledoffgroundandintomagnetFullyloadedpalletjacketpulledintoboreFixproblemPullobjectoffmagnetUseforcefuldevicesuchasawinchTurnoffmagnetcompletelyApplicationsBrainTumorsAneurysmsBloodclotsSpin

7、eIndividualvertebraeKneesShouldersHipsPreventstrokesDiagnoseMultipleSclerosisQUESTIONS?医院固定资产分类02专用设备201医用电子仪器20101用于心脏的治疗、急救装置植入式心脏起搏器、体外心脏起搏器、心脏除颤器、心脏调搏器、主动脉内囊反搏器、心脏除颤起搏仪20102有创式电生理仪器及创新电生理仪器体外震波碎石机、病人有创监护系统、颅内压监护仪、有创心输出量计、有创多导生理记录仪、心内希氏束电图机、心内外膜标测图仪、有创性电子血压计20103有创医用传感器各种植入体内的医用传感