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1、低管电压CTA对颅内微小动脉瘤诊断价值［摘要］目的探讨100kV低管电压脑CT血管成像(CTangiography,CTA)对颅内微小动脉瘤的诊断价值。方法回顾分析100kV低管电压CTA(L-CTA)和120kV常规管电压CTA(C-CTA)两组中经3D-DSA或手术证实瘤体最大径W3mm微小动脉瘤，就两组CTA对微小动脉瘤的显现及其血管密度、形态、边缘、小动脉显示进行客观和主观评价，并对辐射剂量和相关图像噪声进行评价。结果与C-CTA组相比,L-CTA组CTDIvol降低了35.65%,剂量长度乘积(DLP)及有效
2、剂量(ED)也明显下降。虽然L-CTA组图像噪声显著增加，但L-CTA、C-CTA两组各血管间CNR、SNR差异及主观质量差异均无统计学意义(P>0.05)oC-CTA.L-CTA诊断动脉瘤的灵敏度为93.88%和92.16%,两组之间差异无统计学意义(P>0.05)o结论L-CTA扫描在降低辐射剂量的同时，其图像质量和对微小动脉瘤的诊断并不受影响，是一种行之有效的低剂量扫描方法。［关键词］体层摄影术；X线计算机；辐射剂量；管电压;图像质量；动脉瘤［中图分类号］R816.1［文献标识码］B［文章编号］1673-9701
3、(2013)34-0100-04ThevalueofcerebralCTangiographywithlowtubevoltageindiagnosisofintracranialmicro-aneurysmsLIRuiDUANYuxiaCHENWeijianWANGZhenzhangCAOGuoquanRadiologyImagingCenter,theFirstAffiliatedHospitalofWenzhouMedicalUniversity,Wenzhou325000,China[Abstract]Obje
4、ctivetoinvestigatethevalueofcerebralCTangiography(CTA)with100kVlowertubevoltageindiagnosisofintracranialmicro-aneurysms.MethodsIngroupCTAwith100kVlowtubevoltage(L-CTA)andgroupCTAwith120kVconventionaltubevoltage(C~CTA),patientswithmicro-aneurysms(thebiggestdiamet
5、erW3mm)identifiedby3D-DSAorsurgicalwereretrospectiveanalyzed.Thediagnosticvalueandimagequalitiesincludingvascularattenuationvolue,vascularmorphologyandmargin,depictionofsmallarterialdetailswerecomparedbetweentwogroups.Theradiationdoseandimagenoiseofthetwogroupsw
6、erealsocomparedrespectively.ResultsComparedwithgroupC~CTA,theCTDIvolofgroupL-CTAreduced35.65%,doselengthproduct(DLP),effectivedose(ED)alsoreducedsignificantly.AlthoughthenoiselevelwasmarkedlyhigheratgroupL-CTA,thecalculatedCNRs,SNRsaswellassubjectiveimagequality
7、showednodifferencesbetweenthetwogroups(P>0.05)・WiththeresuItsof3D-DSAas“goldstandard^,thesensitivity,ofC~CTAandL-CTAindiagnosisofmicro-aneurysmswere93.88%and92.16%.TherewerenosignificantdifferenceinsensitivitybetweentheC~CTAandL-CTAgroups(P>0.05).ConclusionTheva
8、lueofcerebralCTAwith100kVlowtubevoltageindetectionofintracranialmicro-aneurysmsissignificant,anditshouldberecommendedasaroutinescanmethod.[Keywords]Tomography；X-rayco
