ABSTRACT
Objective TostudythevalueofquantitativeparametersofDCE-MRIandthreedimensionalarterialspinlabeling(3D-ASL) inpreoperativegliomagrading.Methods 70patientsdiagnosedpathologicallywithinitialgliomawereassessedretrospectively,including 32caseswithlow-gradeglioma(LGG)and38caseswithhigh-gradeglioma(HGG).Allpatientsunderwentconventional,enhanced, DCEand3D-ASL MRIat3.0Tbeforesurgery.TheparametricvaluesofDCEsuchasvolumetransferconstant(Ktrans),extravascular extracellularspacevolumefraction(Ve),therateconstant(Kep),fractionalplasmavolume(Vp),cerebralbloodflow (CBF)andcerebral bloodvolume(CBV)wereobtainedbycorrespondingpost-processingsoftware.ThecerebralbloodflowofASL (ASL-CBF)wasalso obtained.Ttestoftwoindependentsampleswasusedtoanalyzewhetherthemaximumandaveragevaluesofeachparameterwere statisticallydifferentbetweenLGGand HGG.Thediagnosticaccuracyofdifferenttechniqueforgliomagradingwasdeterminedby ROCcurveanalysis.Results ThemaximumvaluesofDCE-Ktrans,Ve,rCBVandmaximumvalueofASL-rCBFwerestatisticallydifferent betweentheHGGandLGG (P<0.05).AlltheparametricaveragevalueswerestatisticallydifferentbetweentheHGGandLGG (P<0.05).ThemaximumandaveragevaluesofKtranshadarelativelyhighestdiagnosticefficiencyinallparameters,withtheAUCwere0.986 and0.971,theoptimumthresholdwere0.264and0.068,thesensitivitywere93.3%and94.1%,andthespecificitywere100%and 100%,respectively.ThemaximumvaluesofVe,rCBV,ASL-rCBFandtheaveragevaluesofallparametershadarelativelyhigher diagnosticefficiency.Conclusion ThemaximumvaluesofKtrans,VeandrCBFofDCE,themaximumvalueofASL-rCBFandtheaverage valueofeachparameterwereusefultodistinguishbetweenLGGand HGG.ThemaximumandaveragevaluesofKtransarethebest parametersforidentifyingHGGandLGG.
ABSTRACT
Objective Tomeasurecerebralbloodflow (CBF)inpatientswith middlecerebralartery (MCA)stenosisoracute stroke.Methods SeventyGonepatientswithstenoticMCAoracutestrokewererecruitedandclassifiedintofourgroups:mild MCA stenosis,severeMCAstenosis,occluded MCAandacutestroke.TheacquisitionprotocolsincludedASLsequence.CBFwereobtained from ASLsequence.CBFwasmeasuredandaveragedintheregionssuppliedby MCA.Theratiosoflesion/contralateralhemispheric CBFvaluesweredefinedastherelativeCBF (rCBF).Alldatawereperformedstatisticalanalyze.Results Thehemisphereswithstenotic MCAoracutestrokeshowedasignificantlylowerCBFthanthecontralateralhemispheres.TherewerenointerGgroupdifferencesin thecontralateralhemisphereCBFamongfourgroups.Additionally,significantdifferencesinlesionCBFandrCBF werefoundinthe foursubgroups.Patientswithoccluded MCAshowedthesamerCBFasthatwithacutestroke.Conclusion WiththedegreeofMCA stenosisaggravating,CBFdecreasesintheterritorysuppliedby MCA.Moreover,thepatientswhoseCBFislowerthan33.33 mL??min-1??100g-1orrCBFislowerthan0.69shouldperformactivetreatment.