低场MRI在四肢木、竹类异物诊治中的应用

The application of low-field MRI in the diagnosis of wooden or bamboo foreign bodies in limbs

目的:探讨低场MRI在四肢木、竹类异物诊治中的应用价值。方法:回顾性分析本院2007年-2013年行MRI检查并经手术探查取出四肢木、竹类异物的15例患者(27块异物)的临床和MRI资料,15例均行SE T1WI、FSE T2WI、STIR及GRE T2*WI扫描,分析比较4种序列对异物及周围改变的显示情况。结果:15例患者的27块异物中,SE T1WI显示13块,FSE T2WI显示22块,STIR显示27块,GRE T2*WI显示26块。FSE T2WI、STIR、GRE T2*WI对异物显示率高于SE T1WI。SE T1WI对出血的显示率高于FSE T2WI。SE T1WI和GRE T2*WI对挫伤的显示率均低于FSE T2WI和STIR。结论:MRI是检出四肢木、竹类异物十分有效的方法,STIR和GRE T2*WI是检出异物最敏感的序列,STIR是显示异物周围改变最敏感的序列,综合运用多种序列可提高异物的检出率,为避免漏诊、误诊应行双侧对比检查。

Objective：To investigate the clinical value of low field MRI in the diagnosis of wooden or bamboo foreign bodies in limbs.Methods：Low field MRI of 27 pieces of wooden or bamboo foreign bodies in 15 patients were performed and confirmed by surgery.MRI pulse sequences included SE T1 WI、FSE T2 WI、STIR and GRE T2 ＊WI.Results：Of the 27 pieces of foreign bodies,13 were detected on SE-T1 WI,22 were detected on FSE-T2 WI,27 were detected on STIR,26 were detec-ted on GRE T2 ＊WI.The detection rates of FSE T2 WI、STIR、GRE T2 ＊WI were higher than SE T1 WI.The detection rate of SE T1 WI was higher than FSE T2 WI.The detection rates of SE T1 WI and GRE T2 ＊WI were higher than FSE T2 WI and STIR.Conclusion：MRI is an effective method in detection of wooden or bamboo foreign bodies.STIR and GRE T2 ＊WI is the most sensitive sequence in detection of such foreign bodies,while STIR is most sensitive in the detection of the changes around foreign bodies.Scanning of bilateral limbs for comparison is necessary to avoid misdiagnosis.