Wen Baohong, Cheng Jingliang, Zhang Huixia, Zhang Yong, Zhang Xiaonan, Yan Chenyu, Zhang Fengguang
1 Department of MRI, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, P. R. China.
2 Department of Radiology, Henan Tumor Hospital, Zhengzhou, P. R. China.
J Int Med Res. 2018 Nov;46(11):4717-4721. doi: 10.1177/0300060518796388. Epub 2018 Oct 1.
Intraocular foreign body (IOFB), a frequent cause of ocular trauma, causes serious damage to the eyes. This study was designed to elaborate and compare the characteristics of different magnetic resonance imaging (MRI) sequences in detecting wooden IOFBs in rabbits.
The right vitreous of 24 healthy rabbits was randomly implanted with diverse wooden foreign bodies (diameter φ = 0.2 mm). The T-weighted imaging (TWI), T-weighted imaging (TWI), proton density-weighted imaging (PDWI), and susceptibility-weighted imaging (SWI) sequences were applied individually 2 weeks after the implantation.
IOFBs were detected as linear low signals on TWI, TWI, PDWI, and SWI (SWI image). The detectable rates of poplar wood with a length of 0.5 mm were 0%, 50%, 0%, and 67% for TWI, TWI, PDWI, and SWI, respectively. SWI and TWI sequences exhibited higher sensitivity than TWI and PDWI. The detectable rates of the first three SWI sequences (magnitude, phase, and SWI) were all 67%, which was higher than that of the minimum intensity projection sequence (33%).
MRI is practicable in the diagnosis of wooden IOFBs. SWI and TWI are optimal for the integrated diagnosis of wooden IOFBs and could be used for diagnosis and immediate treatment.
眼内异物（IOFB）是眼外伤的常见原因，会对眼睛造成严重损害。本研究旨在阐述并比较不同磁共振成像（MRI）序列在检测兔眼木质IOFB中的特征。
将24只健康兔的右眼玻璃体随机植入不同的木质异物（直径φ = 0.2 mm）。植入后2周分别应用T加权成像（TWI）、T加权成像（TWI）、质子密度加权成像（PDWI）和磁敏感加权成像（SWI）序列。
在TWI、TWI、PDWI和SWI（SWI图像）上，IOFB被检测为线性低信号。长度为0.5 mm的杨木在TWI、TWI、PDWI和SWI上的可检测率分别为0%、50%、0%和67%。SWI和TWI序列比TWI和PDWI表现出更高的敏感性。SWI的前三个序列（幅值、相位和SWI）的可检测率均为67%，高于最小强度投影序列（33%）。
MRI在木质IOFB的诊断中是可行的。SWI和TWI是木质IOFB综合诊断的最佳序列，可用于诊断和即时治疗。
