摘要
目的:通过分析42例55枚眼内异物的MRI表现,并与CT和X线平片比较,探讨了MRI对眼内异物的诊断价值。材料与方法:男33例,女9例,年龄5~45岁。55枚眼内异物中非磁性异物53枚,铁磁性异物2枚。每例均在术前1个月内完成X线平片、CT和MRI检查。结果:(1)MRI对55枚眼内异物检出率(94%)和CT(91%)相仿(P>0.25),均明显高于X线平片(42%)(P<0.005);(2)MRI对眼内异物相关并发症的显示优于CT,而其对巩膜异物的显示差于CT;(3)SE序列T2WI和PDWI(质子密度加权成像)是检出眼内异物的优选序列;(4)非磁性异物MRI呈信号缺失区,无伪迹产生;而铁磁性异物产生大量伪迹,并可致眼部额外损伤。结论:MRI是检出眼内非磁性异物的有效方法,特别适用于X线平片和CT不能显示的少数非金属异物。眼内铁磁性异物不适于MRI。
Purpose:ToevaluateMRIinintraocularforeignbodiesascomparedwithCTaswelasconventionalX-rayfilms.Materialsandmethods:Therewere55intraocularforeignbodiesin42patients,33malesand9femalesagerangedfrom5~45years.Fifty-threeofthe55foreignbodieswerenon-magnetic,andtheremaining2wereferromagneticobjects.ConventionalX-rayfilms,CTandMRIexaminationswereaccomplishedwithinonemonth.Results:(1)Thepositiverateforshowing55intraocularforeignbodieswassimilaronMRI(94%)andCT(91%)(P>0.25),butmuchhigherthanconventionalX-rayfilms(42%)(P<0.005);(2)MRIwassuperiortoCTforthedemonstrationofeyecomplicationsrelatedtotheforeignbodies,butthecontrarywastruewhentheywerelocatedwithinthesclera;(3)T2WIandPDWIofSEsequencewerethemethodofchoiceforthedemonstrationoftheseforeignbodies;(4)non-magneticforeignbodiesusualyshowedsignallosswithoutartifactonMRI,whileferromagneticsubstancesproducedremarkableartifactandmightleadtoaccidentalinjuryoftheeye.Conclusion:MRIwasaneffectivemethodfortheevaluationofnon-magneticforeignbodiesoftheeye,especialyforthenon-metalicforeignbodiesundetectablewithCTorconventionalX-rayfilm.Itwasnotrecommendedforferromagneticforeignbodies.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
1996年第10期678-681,共4页
Chinese Journal of Radiology
基金
河南省科技攻关资助项目
关键词
眼内异物
NMR
成像
CT
IntraocularforeignbodiedMagneticresonanceimagingTomography,X-raycomputed