CT与平片诊断气管、支气管可透光异物的对比分析

目的　探讨气管、支气管可透光异物的CT表现及诊断价值。方法　对 46例气管、支气管可透光异物患者的平片与CT片进行对比分析。结果　本组 46例中 ,CT直接显示气管异物 9例 ,右支气管异物 13例 ,左支气管异物 7例 ,双侧支气管异物 2例 ,CT间接提示右支气管异物 8例 ,左支气管异物 6例 ,双侧支气管异物 1例 ,检出率 10 0 % ;平片未直接显示异物及其所在解剖位置 ,而显示肺气肿、阻塞性肺炎、肺不张等间接征象 3 4例 ,另 12例平片未见异常征象 ,检出率 73 .9%。结论　平片无法直接显示可透光异物 ,只能显示其间接征象 ;CT扫描不仅能提示异物所在的解剖位置 ,而且能直接显示异物的形态、大小等 ,提供较X线平片更多的信息 ,对临床医师取出异物有重要的指导意义

The Comparative Analysis on CT and X-ray Film in Diagnosis of Transparent Foreign Body in Trachea and Bronchus

Objective To study the CT signs of bronchotracheal transparent foreign body and its diagnostic value.Methods The X-ray and CT findings of bronchotracheal trasparent foreign body in 46 cases were analysed comparativly.Results Among 46 cases,9 cases of trachea foreign body,13 cases of right bronchial foreign body,7 cases of left bronchial foreign body,2 cases of both sides of bronchial foreign body were showed directly by CT,and 8 cases of right bronchia foreign body,6 cases of left bronchia foreign body,1 case of both sides of bronchia foreign body showed indirectly on CT,the sensitivity was 100 percent,while the foreign body and its anatomical location could not be showed on X-ray film,but the indirect signs just like pulmonary emphysema,obstructive pulmonitis and drowned lung etc,could be showed by X-ray films in 34 cases.In another 12 cases were negative,the sensitivity was 73.9 percent.Conclusion The transparent foreign body can not be showed but indrect signs by X-ray film;While CT scan can not only shows the anatomical location of foreign body,but also the shape and size of the foreign body,it offers more information than X-ray films and has important refering value to clinicians to take out the foreign body.