兔眼玻璃体内非磁性异物CT和MRI诊断  

An Experimental study of MRI and CT in the detection of intravitreous nonmagnetic foreign bodies of rabbits

作　　者：程敬亮[1,2,3] 任翠萍[1,2,3] 姜曦 齐云秋[1,2,3] 游浩凌 李荫太 高剑波[1,2,3] 

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 [3]河北省张家口市第四医院眼科

出　　处：《河南医科大学学报》1998年第2期6-10,共5页Journal of Henan Medical University

基　　金：河南省科技攻关项目

摘　　要：将４６枚大小介于１ｍｍ×０．５ｍｍ×０．５ｍｍ～５ｍｍ×３ｍｍ×２ｍｍ的非磁性异物（非金属异物３４枚，金属异物１２枚）放入２３只兔的４６眼玻璃体内，并在置入异物２ｈ内完成ＣＴ和ＭＲＩ扫描。结果：ＣＴ检出玻璃体异物阳性率为９１％（４２／４６），ＭＲＩＴ１ＷＩ、ＰＤＷＩ、Ｔ２ＷＩ和Ｆｌａｓｈ２ｄ序列检出玻璃体异物的阳性率分别为６３％（２９／４６）、８７％（４０／４６）、１００％（４６／４６）和１００％（４６／４６）；４枚塑料异物ＣＴ未显示，而ＭＲＩ正确诊断；１２枚金属异物中１１枚ＣＴ图像上有线束状伪迹，而ＭＲＩ则无。结果提示：ＣＴ和ＭＲＩ均是检出眼内非铁磁性异物的有效方法，２者联合应用，可提高眼内异物的检出率及定位准确率；ＭＲＩ检出木质和塑料异物优于ＣＴ；? To evaluate the diagnostic value of CT and MRI for intraocular foreign bodies (FB),46 nonmagnetic FB were inserted into 46 vitreous bodies of 23 rabbits.Of 46 nonmagnetic FB,34 were nonmetallic and 12 were metallic.CT and MRI examinations in all rabbits were accomplished within 2 hours after operation.Dimensions of FB varied from 1 mm×0.5 mm×0.5 mm to 5 mm×3 mm×2 mm.The positive rates of 46 nonmagnetic intravitreous FB on CT,T1WI,PDWI,T2WI and Flash2d sequence of MRI were 91%,63%,87%,100% and 100% respectively.Four plastic FB were seen on MRI, but not on CT.Beamhardening artifacts were found on CT in 11 of 12 metallic FB,but not on MRI.Our results demonstrated that CT or MRI was an effective method for detecting intraocular FB.When CT and MRI were used at the same case,locative accuracy and detective positive rate of intraocular FB were improved.MRI was superior to CT in detecting wooden and plastic intraocular FB.T2WI of SE sequence and Flash2d sequence were the choice sequence for detecting intravitreous FB.

关 键 词：眼损伤 眼异物 玻璃体内异物 CT MRI 诊断 

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