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Significance of Low-Attenuation Cluster Analysis on Quantitative CT in the Evaluation of Chronic Obstructive Pulmonary Disease.

Abstract：

Objective:To assess clinical feasibility of low-attenuation cluster analysis in evaluation of chronic obstructive pulmonary disease (COPD). Materials and Methods:Subjects were 199 current and former cigarette smokers that underwent CT for quantification of COPD and had physiological measurements. Quantitative CT (QCT) measurements included low-attenuation area percent (LAA%) (voxels ≤ -950 Hounsfield unit [HU]), and two-dimensional (2D) and three-dimensional D values of cluster analysis at three different thresholds of CT value (-856, -910, and -950 HU). Correlation coefficients between QCT measurements and physiological indices were calculated. Multivariable analyses for percentage of predicted forced expiratory volume at one second (%FEV1) was performed including sex, age, body mass index, LAA%, and D value had the highest correlation coefficient with %FEV1 as independent variables. These analyses were conducted in subjects including those with mild COPD (global initiative of chronic obstructive lung disease stage = 0-II). Results:LAA% had a higher correlation coefficient (-0.549, p < 0.001) with %FEV1 than D values in subjects while 2D D-910HU (-0.350, p < 0.001) revealed slightly higher correlation coefficient than LAA% (-0.343, p < 0.001) in subjects with mild COPD. Multivariable analyses revealed that LAA% and 2D D value-910HU were significant independent predictors of %FEV1 in subjects and that only 2D D value-910HU revealed a marginal p value (0.05) among independent variables in subjects with mild COPD. Conclusion:Low-attenuation cluster analysis provides incremental information regarding physiologic severity of COPD, independent of LAA%, especially with mild COPD.

journal_name

Korean J Radiol

journal_title

Korean journal of radiology

authors

Nambu A,Zach J,Kim SS,Jin G,Schroeder J,Kim YI,Bowler R,Lynch DA

doi

10.3348/kjr.2018.19.1.139

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

139-146

issue

1

eissn

1229-6929

issn

2005-8330

journal_volume

19

pub_type

杂志文章

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