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1、154临床放射学杂志2011年第30卷第2期中枢神经放射学颅内钙化灶的磁敏感加权成像*刘红军,黄飚,张水兴,杨万群,梁长虹摘要目的探讨颅内钙化灶的磁敏感加权成像(susceptibility-weightedimaging,SWI)表现及其对钙化灶的诊断价值。资料与方法经CT证实的颅内钙化灶患者9例,其中少突胶质细胞瘤2例,星形细胞瘤1例,海绵状血管瘤2例,脑囊虫病2例,不明原因钙化2例,共34枚钙化灶(生理性钙化灶11枚)。均行SWI并经后处理得到SWI及校正后相位图,观察钙化灶在SWI及相位图上的表现。结果钙化灶大小1~1
2、2mm,SWI上呈极低信号,相位图均呈不均匀高信号,其形态及大小与CT所见一致。结论SWI相位图显示颅内钙化灶为高信号,敏感性可达100%,分辨率高,最小可检出1mm的钙化灶,可弥补MRI常规序列的不足。关键词磁敏感加权成像钙化灶颅内MagneticResonanceSusceptibilityWeightedImagingofIntracranialCalcificationLIUHongjun,HUANGBiao,ZHANGShuixing,eta.lDepartmentofRadiology,GuangdongGeneralHos
3、pita,lGuangdongAcademyofMedicalSciences,Guangzhou,GuangdongProvince510080,P.R.ChinaAbstractObjectiveTostudythemanifestationofintracranialcalcificationonsusceptibilityweightedimages,andevaluatethevalueofsusceptibilityweightedimagingindetectingintracranialcalcification.Mater
4、ialsandMethods34calcificationfociidentifiedbyCTin9patientswereenrolledinthisstudy,including2oligodendrogliomas,1astrocytoma,2cavernomas,2braincysticercosisand2caseswithagnogeniccalcifications.AllpatientsunderwentsusceptibilityweightedimagingandSWIreconstructionimagesandcorrec
5、tedphaseimageswereacquiredthroughpostprocessing,thenthesignalintensityofcalcificationonSWIreconstructionimagesandcorrectedphaseimageswereobserved.ResultsThesizeofcalcificationfocivariedfrom1mmto12mm,andallcalcificationspresentedashypointensityonSWIreconstructionimagesandinhom
6、ogeneoushyperintensitysignaloncorrectedphaseimages.ConclusionIntracranialcalcificationisdetectedashyperintensityonSWIphaseimageswithasensitivityof100%,thespatialresolutionofSWIishighanditcandetect1mm-sizecalcification.SWIisausefulcomplementarysequencefortheroutineMRIinthedete
7、ctionofintracranialcalcifica-tions.KeywordsSusceptibility-weightedimagingCalcificationIntracranial磁敏感加权成像(susceptibility-weightedima-断准确性。ging,SWI)是利用组织间磁敏感度的差异产生图像对比,对血液代谢产物、铁质沉积等顺磁性物质十分1资料与方法敏感,在脑肿瘤、脑血管病、脑外伤、神经变性病等中1.1一般资料枢神经系统病变中有较高的临床应用价值。与顺磁经CT证实的颅内钙化灶患者9例,男3例,女性
8、物质(脱氧血红蛋白、含铁血黄素等)不同,钙质6例,年龄21~52岁,平均32.6岁。均经CT证实,属反磁性物质,在SWI相
