兔眼玻璃体内生物组织异物CT和MRI诊断  

An experimental investigation of intravitreous biological tissues on CT and MRI in rabbits

作　　者：任翠萍[1,2] 齐云秋 程敬亮[1,2] 李荫太[1,2] 杨学华[1,2] 姜曦[1,2] 李天晓[1,2] 

机构地区：[1]河南医科大学第一附属医院放射科 [2]河南医科大学第一附属医院眼科

出　　处：《河南医科大学学报》1998年第2期18-20,共3页Journal of Henan Medical University

基　　金：河南省科技攻关项目

摘　　要：将１０枚生物组织异物（巩膜、角膜、结膜、横纹肌和脂肪各２枚）分别置入５只兔的１０只眼玻璃体内，并与眼内积气、出血和青枝柳条对照，探索眼内生物组织异物的ＣＴ和ＭＲＩ表现。ＣＴ和ＭＲＩ在置入异物后２ｈ内完成。结果：巩膜、角膜、结膜和横纹肌ＣＴ图像上密度高于玻璃体，ＣＴ值４７～５２．５Ｈｕ。Ｔ１ＷＩ呈略高信号，Ｔ２ＷＩ和Ｆｌａｓｈ２ｄ序列呈低信号；脂肪呈脂肪性低密度，Ｔ１ＷＩ和ＰＤＷＩ呈明显高信号，Ｔ２ＷＩ和Ｆｌａｓｈ２ｄ序列呈相对低信号；８枚中４枚小于１．５ｍｍ×１ｍｍ×０．８ｍｍ的巩膜、角膜、结膜和横纹肌ＣＴ漏检；Ｔ１ＷＩ检出５枚，ＰＤＷＩ未显示１枚，Ｆｌａｓｈ２ｄ和Ｔ２ＷＩ全部检出。结果提示：ＭＲＩ检出眼内巩膜、角膜、结膜和横纹肌优于ＣＴ，ＳＥ序列、Ｔ２ＷＩ和Ｆｌａｓｈ２ｄ序列是检出这些组织的优选序列，但ＣＴ和ＭＲＩ不能分辨其组织类别，并且难与新鲜木异物区别；ＣＴ和ＭＲＩ联合应用能确定眼内脂肪性异物的性质，且能有效与眼内干木异物。お? In order to investigate CT and MRI manifestations of intravitreous various biological tissues,10 tissues including the sclera,cornea,conjunctiva,striated muscle and fat were implanted into the corpus vitreum respectively in 10 eyes of 5 rabbits,while inserted intravitreous air bubble,blood and fresh willow pieces were used as controls.Two hours after the implantation,investigation of the experimental eyes by CT and MRI was performed.The density of sclera,cornea,conjunctiva and striated muscle was higher than that of corpus vitreum.Their CT attenuation values ranged from 47 to 52.5 Hu,however,there were slightly high signal intensity on T1WI and obviously low signal intensity on T2WI and Flash2d sequence of MRI.Fat showed very low density as usual on CT and very bright signals on T1WI and PDWI of SE sequence,however,the signal intensity decreascd on T2WI and Flash2d images.Among 8 pieces of sclera,cornea,conjunctiva and striated muscle,4 were not detected by CT,which were less than 1.5 mm×1 mm×0.8 mm.All of them were found by T2WI or Flash2d images of MRI,but only 5 discovered by T1WI,and nothing by PDWI of MRI.The results indicated that MRI was superior to CT in detection of intravitreous biological tissues,and among all methods,T2WI of the SE sequence or Flash2d sequence was the best choice.However, except fat,it was impossible to differentiate different kinds of biological tissues or distinguish from fresh wooden pieces either by MRI or by CT.The combination of CT and MRI can differentiate intravitreous fat,dry wooden pieces,air bubbles as well as blood clots.

关 键 词：眼异物 玻璃体内 生物组织异物 CT 磁共振成像 

分 类 号：R779.140.4[医药卫生—眼科] R816.97[医药卫生—临床医学]