空气潴留在呼气CT上表现为受累的肺实质较周围正常肺密度为低。它可见于肺气肿、哮喘、支扩、组织细胞增生症X、慢性气道病和儿童肺病中。但也曾见于无症状的吸烟或不吸烟人群中,但以往对此仅有少数报道,且被检查人数太少,多为青年人。作者目的是研究在无症状人群中空气潴留的发生率以及与年龄、吸烟的关系。本组共82例,均为20岁以 Air retention in the expiratory CT showed involvement of the lung parenchyma than the surrounding normal lung density is low. It can be seen in emphysema, asthma, bronchiectasis, histiocytosis X, chronic airway disease and childhood lung disease. But it has also been seen in asymptomatic smokers or non-smokers, but in the past there were only a few reports and too few were examined, mostly young people. The aim of the study was to investigate the incidence of air retention in asymptomatic populations and their relationship to age and smoking. This group a total of 82 cases, both 20 years old