CTA-AND-CTP

CTAANDCTP12theoryClinicalapplicationCTA---theoryCTA（computertechnologyangiographyItusesthetechnologyofMSCT(multislicespriralCT)andtheintravenousinjectionofcontrastagent.Itdisplaysthebloodvesselofbrainfromdifferentpointsofviews.3CTA---theoryThenwecanusethespecialsoftwaretodealwiththeimageswereceive.MIP(maximumintensityprojection)VR(volumerendering)4CTA---theoryMSCT2020/3/315CTA---theoryMIP2020/3/316CTA---theoryMIP2020/3/317CTA---theoryMIP2020/3/318CTA---theoryVR2020/3/319CTA---theoryVR:Arterystenosis2020/3/3110CTA---theoryVR:aneurysmCTA---clinicalapplicationItcandisplaysomeimportantvesselofbraindistinctlyandaffordevidenceforthediagnonsisofcerebrovasculardiseases2020/3/3112CTP----theoryCTP(computertechnologyperfusion)ItusesthetechnologyofMSCT(multislicespriralCT)andtheintravenousinjectionofcontrastagent.Thenitscanstheselectedarea.Accordingtothedensityofthecontrastagent,wegettheTDC(time-densitycurve).2020/3/3113CTP----theoryAccordingtoTDC,wecangetsomeusefulparameterCBF(cerebralbloodflow)CBV(cerebralbloodvolume)MTT(meantransittime)TTP(timetopeak)2020/3/3114CTP----theoryThentoanalyzetheperfusionmapweget,andcomparetheparameterbetweenthenormalandabnormalarea.2020/3/3115CTP----theory2020/3/3116CTP---clinicalapplicationacuteischemicstrokedeterminetheischemicpenumbra2020/3/3117CTP---clinicalapplicationdeterminetheischemicpenumbraMethod1:thedismatchingofCBFandCBV(Intheischemicarea,CBFdescendslittleandCBVisnormalorascendlittle,thatistheischemicpenumbra)2020/3/3118CTP---clinicalapplicationdeterminetheischemicpenumbraMethod2:usethecontrastvalueofCBFtheCBFofischemicareacontrastvalue=theCBFofnormalarea2020/3/3119CTP---clinicalapplicationdeterminetheischemicpenumbraMethod2:contrastvalue2020/3/3120•Thelowestlimitofischemicbraintissuetolive0.2•Theeffectofthrombolytictherapyisbest0.2~0.35•NomethodtocuretheischemicpenumbraLessthan0.22020/3/3121