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1、MRI检查常见伪影的产生机制及解决拈施［摘耍］冃的：研究磁共振成像中常见伪影的产生原因与抑制方法，以减少MRI检查时产生的伪影，提高图像质暈，为临床提供良好的影像资料。方法：收集我院168例患者不同类型和不同程度MRI图像伪影病例,进行系统性分析,其中,四肢扫描17例,脊柱扫描37例，头颈部扫描71例，腹部扫描43例。结果：卷褶伪影36例，占21.4%；容积效应伪影10例，占5.9%；化学位移伪影12例，占7.2%；运动伪影66例，占39.2%；磁化率伪影及金属伪影24例，占14.3%；交叉伪影9例，占5.4%；截断伪影11例，占6.6%。结论：了解各种伪影产生的机制，利用各种有效技术抑制
2、或消除图像伪影，对提高图像质量和提高诊断率具冇重要意义。［关键词］磁共振成像；伪影［中图分类号］R445.2［文献标识码］B［文章编号］1673-7210(2011)12(b)-104-03DiscussionofformationmechanismandsolutionsofartifactscommonlyseeninmagneticresonaneeimagingexaminationHEWeihongl,FANGXiangjunl,CHENWei21・DepartmentofRadiology,theSecondHospitalAffiliatedtoNanhuaUniversit
3、y,Hu'nanProvince,Hengyang421001,China;2.DepartmentofRadiology,XiangyaHospitalofCcntralSouthUniversity,Hu'nanProvince,Changsha410008,China［Abstract］Objective:Toreducetheartifactsgeneratedinmagneticresonaneeimaging(MRT)examination,improvetheimagequalityandprovidegoodimagedataforclinicalusebystudying
4、thegenerationreasonsandsuppressionmethodsofartifactscommon1)^seeninMRIexamination.Methods:MedicalrecordswithdifferenttypesandvaryingdegreesofMRimageartifactsof168patientsofourhospitalwerecollectedforsystematicanalysis,ofwhich17caseswerelimbssean,37caseswerespinescan,71caseswereheadandneckscanand43
5、caseswereabdomenscan.Results:Therewere36casesoffoldedartifacts,accountingfor2・4%，10casesofvolumeeffectartifacts,accountingfor5.9%,12casesofchemicalshiftartifacts,accountingfor7.2%,66casesofmotionartifacts,accountingfor39.2%,24casesofmagneticsusceptibilityartifacts,accountingfor4.3%,9casesofcrossar
6、tifacts,accountingfor5・4%and11casesoftruncationartifacts,accountingfor6.6%.Conclusion:Understandingthegenerationmechanismofvariousartifactsandusingvariouseffectivetechniquestosuppressoreliminateimageartifactsareofimportantsignificancetoimprovetheimagequalityandthediagnosticrate.［Keywords］Magneticr
7、esonanceimaging;Artifacts随着磁共振(MRI)临床应用的普及，高质量的MRI影像对疾病的诊断价值显得更加重要。磁共振成像己经广泛地应用于临床，在人类疾病的诊断中发挥着重要的作用［1］,与其他医学影像技术比较，MRI出现的伪影最多，也最严重。所谓伪影，是只在磁共振扫描或信息处理过程小，由于某一种或儿种原因出现了一些人体本身不存在的、致使图像质量下降的影像，也称为假影或鬼影［2］,伪影实际上也是MRI
