摘要
目的：探讨胎脑髓鞘的生长发育状况。材料与方法：采用超导０．３５Ｔ磁共振成像仪，对４４例孕妇进行ＭＲ成像，分析其正常胎脑主要结构的信号变化。结果：胎儿的大脑（基底节除外）、小脑实质在Ｔ１加权像上为略低信号，在质子密度加权像上为等信号，在Ｔ２加权像上为高信号。孕２９周前脑干、基底节在Ｔ１加权像上呈略低信号，孕２９周后呈等信号；在质子密度加权像及Ｔ２加权像上其信号同大脑、小脑实质信号。结论：脑干、基底节的髓鞘在孕２９周后形成；其形成过程由脑干开始至基底节；而在胎儿期，大脑（基底节除外）、小脑实质内髓鞘尚未形成。南京军区总医院医学影像科（王中秋）；
Purpose:Tostudythemyelinizationprocessofthefetalbrain.Materialsandmeth-ods:Forty-fourcasesofpregnantwomenwereimagedwithMRat0.35T.Thesignalchangesofthemainstructuresofthefetalbrainwereanalysed.Results:Thesignalintensitiesofcerebrum(exceptbasalganglia),andcerebelumwerehypo-intenseonT1WI,iso-intenseonPDWIandhyper-intenseonT2WI.Thebrainstemandbasalgangliademonstratedslightlyhypointensesignalbefore29weekpregnancyandiso-intensesignalafter29weekpregnancyonT1WI.TheirsignalintensitieswereequaltothoseofcerebrumandcerebelumonPDWIandT2WI.Conclusion:Therewasnomyeliniza-tionofcerebrum(exceptbasalganglia)andcerebelumofthefetusduringpregnancy.Myelinizationbeganatthebrainstemandbasalgangliaafter29weekpregnancy.Theprocessofmyelinizationpro-gressedfrombrainstemtobasalganglia.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
1996年第10期659-662,共4页
Chinese Journal of Radiology
关键词
胎儿发育
脑髓鞘发育
NMR
成像
FetaldevelopmentbrainMagneticresonanceimagingMyelinsheath
