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1、MRI检查常见伪影产生机制及解决措施［摘要］目的：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，提高图像质量，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,
2、=
3、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"例，占6.6%o结论：了解各种伪影产生
4、的机制，利用各种有效技术抑制或消除图像伪影，对提高图像质量和提高诊断率具有重要意义。［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)-104-03DiscussionofformationmechanismandsolutionsofartifactscommonlyseeninmagneticresonanceimagingexaminationHEWeihongl,FANGXiangjunl,CHENWei2DepartmentofRadiology,theSecondHospitalA
5、ffiliatedtoNanhuaUniversity,Hu'nanProvinee,Hengyang421001,China;2.DepartmentofRadiology,XiangyaHospitalofCentralSouthUniversity,Hu'nanProvince,Changsha410008,China[Abstract]Objective:Toreducetheartifactsgeneratedinmagneticresonanceimaging(MRI)examination,improvetheimagequalityandprov
6、idegoodimagedataforclinicalusebystudyingthegenerationreasonsandsuppressionmethodsofartifactscommonlyseeninMRIexamination.Methods:MedicalrecordswithdifferenttypesandvaryingdegreesofMRimageartifactsof168patientsofourhospitalwerecollectedforsystematicanalysis,ofwhich17caseswerelimbsscan
7、,37caseswerespinescan,71caseswereheadandneckseanand43caseswereabdomensean.Results:Therewere36casesoffoldedartifacts,accountingfor2.4%,10casesofvolumeeffectartifacts,accountingfor5.9%,12casesofchemicalshiftartifacts,accountingfor7.2%,66casesofmotionartifacts,accountingfor39.2%,24cases
8、ofmagneticsusceptibilityartifacts,accountingfor4.3%,9casesofcrossartifacts,accountingfor5.4%and11casesoftruncationartifacts,accountingfor6.6%.Conclusion:Understandingthegenerationmechanismofvariouseffectivetechniquestoartifactsandusingvarioussuppressoreliminateimageartifactsareofimpo
9、rtantimagequalityandthesignificancetoimprovethediagnosticrate.[Keywords]Magneticresonanceimaging;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。磁共振成像已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⑴,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中，由于某一种或几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
10、际上也是MRI图像中与实
