医学
霍恩斯菲尔德秤
四分位间距
慢性阻塞性肺病
肺
肺容积
体质指数
核医学
梅萨
人口
放射科
内科学
计算机断层摄影术
计算机科学
环境卫生
程序设计语言
作者
Eric A. Hoffman,Firas S. Ahmed,Heather Baumhauer,Matthew J. Budoff,J. Jeffrey Carr,Richard A. Kronmal,Sony Reddy,R. Graham Barr
出处
期刊:Annals of the American Thoracic Society
[American Thoracic Society]
日期:2014-07-01
卷期号:11 (6): 898-907
被引量:97
标识
DOI:10.1513/annalsats.201310-364oc
摘要
Rationale: Computed tomography (CT)-based lung density is used to quantitate the percentage of emphysema-like lung (hereafter referred to as percent emphysema), but information on its distribution among healthy nonsmokers is limited.Objectives: We evaluated percent emphysema and total lung volume on CT scans of healthy never-smokers in a multiethnic, population-based study. Methods: The Multi-Ethnic Study of Atherosclerosis (MESA)Lung Study investigators acquired full-lung CT scans of 3,137 participants (ages 54-93 yr) between 2010-12.The CT scans were taken at full inspiration following the Subpopulations and Intermediate Outcome Measures in COPD Study (SPIROMICS) protocol."Healthy never-smokers" were defined as participants without a history of tobacco smoking or respiratory symptoms and disease."Percent emphysema" was defined as the percentage of lung voxels below 2950 Hounsfield units."Total lung volume" was defined by the volume of lung voxels.Measurements and Main Results: Among 854 healthy neversmokers, the median percent emphysema visualized on full-lung scans was 1.1% (interquartile range, 0.5-2.5%).The percent emphysema values were 1.2 percentage points higher among men compared with women and 0.7, 1.2, and 1.2 percentage points lower among African Americans, Hispanics, and Asians compared with whites, respectively (P , 0.001).Percent emphysema was positively related to age and height and inversely related to body mass index.The findings were similar for total lung volume on CT scans and for percent emphysema defined at 2910 Hounsfield units and measured on cardiac scans.Reference equations to account for these differences are presented for never, former and current smokers.Conclusions: Similar to lung function, percent emphysema varies substantially by demographic factors and body size among healthy never-smokers.The presented reference equations will assist in defining abnormal values for percent emphysema and total lung volume on CT scans, although validation is pending.
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