目的 探讨胸腔积液在CT胸部平 扫和超声检查中的特征和阳性率。方法 选择2009年10月至2011年10月胸腔积液患 者共200例，其中有44例少量积液，56例 中量积液，60例大量积液，40例包裹性积 液。本组所选200例患者均行B超检查及CT 胸部平扫检查。结果 200例中CT确诊168 例，确诊率达84%；超声确诊199例，确诊 率高达99.5%，超声检查胸腔积液的确诊 率明显比CT高，差异有统计学意义。结论 B超在胸腔积液诊断中存在良好的性价比 及很好的应用价值。

Objective To explore the manifestation and diagnostic positive rates of pleural effusion of chest CT scan and Ultrasound. Methods A total of 200 cases with pleural effusion in our hospital from October 2009 to October 2011 were included into the study, 60 cases had large amount of pleural effusion, 56 cases had middle pleural effusion, 44 cases had small amount, and the other 40 cases had encysted fluid. All cases underwent ultrasound and chest CT plain scan. Results 168 cases were diagnosed by chest CT plain scan, with the diagnostic rate of 84%; 199 cases were diagnosed by ultrasound , with the diagnostic rate of 99.5%, higher than that of the chest CT plain scan, the difference was statistically significant. Conclusion B-mode ultrasound in the diagnosis of pleural effusion was high cost-effective and had better application value.