兔眼玻璃体内鱼刺异物的MRI表现

MRI findings of fishbones in rabbit vitreous body

目的:探讨兔眼玻璃体内鱼刺异物的MRI表现。方法:选取16只新西兰健康大白兔,将其右眼玻璃体内随机植入2枚鱼刺异物,异物直径0.15～0.20mm、长度1.5～3.5mm,左眼作为正常对照,均于术后2h行MRI检查。结果:T1WI检出4枚鱼刺异物,T2WI检出15枚鱼刺异物,PDWI检出6枚,SWI检出26枚。检出的异物在T1WI、T2WI、PDWI、幅值图、最小信号强度投影(mIP)图及磁敏感加权(SWI)图上呈点状或线状低信号,相位图上呈高信号或混杂高信号。结论:兔眼玻璃体内鱼刺异物的MRI表现具有特征性,SWI序列的应用可提高兔眼玻璃体内鱼刺异物的检出率。

Objective.. To investigate magnetic resonance imaging （MRD features of fishbones in rabbit vitreous body. Methods： Sixteen healthy New Zealand rabbits were involved in this study. Fishbones （diameter 0. 15 ~ 0. 20mm, length 1.5~3.5mm） were randomly implanted into the right vitreous body of the rabbits. The left vitreous body without foreign body implanted served as control. All rabbits underwent MRI examination within 2h of implantation. Results.. 4,15,6 and 26 fishbones in rabbit vitreous body were shown on T1 WI, T2 WI, PDWI and SWI, separately. Fishbones exhibited dot or linear in shape and hypointense on TIWI, T2 WI, PDWI, magnitude image, minimum intensity projection （mIP） image and SWI, and appeared hyperintense on phase image. Conclusion： Fishbones in vitreous body of rabbit had some specific MRI apper- ances. SWI sequence is helpful to detect and diagnose fishbones in rabbit vitreous body.