|
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
Clinical application of MRI in intraocular foreign bodies
程敬亮 施光普 汪 浒 任翠萍
Cheng Jingliang*，Shi Guangpu，Wang Hu，et al. * Department of Radiology，the First Affiliated Hospital of Henan Medical University，Zhengzhou 450052
Abstract
Purpose：To evaluate MRI in intraocular foreign bodies as compared with CT as well as conventional X－ray films. Materials and
methods：There were 55 intraocular foreign bodies in 42 patients，33 males and 9 females age ranged from 5～45 years. Fifty－three of the 55 foreign bodies were non－magnetic，and the remaining 2 were ferromagnetic objects. Conventional X－ray films，CT and MRI examinations were accomplished within one month.
Results：（1） The positive rate for showing 55 intraocular foreign bodies was similar on MRI （94％） and CT （91％） （P>0.25），but much higher than conventional X－ray films （42％） （P<0.005）；（2） MRI was superior to CT for the demonstration of eye complications related to the foreign bodies，but the contrary was true when they were located within the sclera；（3） T2WI and PDWI of SE sequence were the method of choice for the demonstration of these foreign bodies；（4） non－magnetic foreign bodies usually showed signal loss without artifact on MRI，while ferromagnetic substances produced remarkable artifact and might lead to accidental injury of the eye.
Conclusion：MRI was an effective method for the evaluation of non－ magnetic foreign bodies of the eye，especially for the non－metallic foreign bodies undetectable with CT or conventional X－ray film. It was not recommended for ferromagnetic foreign bodies.
Key words：Intraocular foreign bodied Magnetic resonance imaging Tomography，X－ray computed
眼内异物是眼穿孔伤的常见合并症，应尽早取出。其准确定位是手术摘除成败的关键。X线平片、CT和超声是检出眼内异物的重要方法，但均有一定局限性[1]。MRI为眼内异物检出提供了新方法。笔者对42例眼内异物MRI资料进行分析，并与X线平片和CT比较，旨在探讨MRI对眼内异物的诊断价值。 | 
