摘要
目的:探讨三维时间飞跃法磁共振血管成像(3DTOFMRA)评价脑动脉瘤的价值与限度。材料与方法:29例临床及影像学证实的脑动脉瘤患者行常规MRI和3DTOFMRA检查,应用1.0T超导MR系统,扫层远端预置饱和带3DFISP序列和最大强度投影(MIP)图像后处理技术。13例同时行脑血管造影,采用Seldinger技术穿刺股动脉选择性全脑血管造影,快速摄片(3~4帧/秒);结果:MRA对脑动脉瘤的敏感性和特异性分别为92.3%和83.3%,结合MRI,其特异性提高到100%。较准确地显示了直径3~15mm动脉瘤的形态、大小及与载瘤动脉的关系,对3mm以下或15mm以上动脉瘤显示欠佳,主要由于其分辨率较低或瘤内血栓或涡流形成等所致;结论:3DTOFMRA对脑动脉瘤有诊断价值。
Puprose:Todeterminethevalueandlimitationof3DTOFMRAindiagnosisofin-tracranialaneurysm.Materialsandmethods:Twenty-ninecaseswith29intracranialaneurysmsun-derwentMRIandMRAon1.0TsuperconductiveMRsystemusinga3DFISPsequencewithpresat-urationbandandMIPpostprocessingalgorithm.Thirteencasesalsounderwnetselectivecerebralan-giography.Results:Thesensitivityandspecitivityof3DTOFMRAwas92.3%and83.3%respec-tively.CombiningwithMRI,itsspecitivitywasimprovedupto100%.Thesite,sizeandmorpholo-gyofaneurysmsmorethan3mmindiameteranditsrelationtosupplyarteryweremoreaccuratelydemonstratedbyMRA.Itwasdificult,however,forMRAtoreliablydepicttheaneurysmsmorethan15mmandlessthan3mmindiameterduetoitsrelativelypoorspatialresolution,vasospasm,thromusinaneurysmorturbulentflow.Conclution:3DTOFMRAwasvaluableasanon-invasivemethodindiagnosisofintracranialaneurysm.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
1996年第7期456-459,共4页
Chinese Journal of Radiology