Although respiratory function tests are the primary method of assessing chronic obstructive pulmonary disease (COPD), the assessment of low-attenuation areas (LAA) on chest computed tomography (CT) has also been reported to facilitate assessment of prognosis. Our hospital installed Lung Vision^® automatic analysis software, which visualizes LAA in yellow on chest CT and enables quantitative assessment. A total of seven patients met the exclusion criteria [improvement of forced expiratory volume in 1 s (FEV₁) by ≥12% or ≥200 ml following inhalation of a β₂ agonist (salbutamol sulfate) in four patients and test discontinuation because of metastatic lung tumor and other reasons in three patients]. Chest CT and respiratory function tests were conducted in 45 patients, and the results were assessed to determine the presence of correlations. A significant correlation (p<0.01) was observed between the Lung Vision score and FEV₁/FVC, FEV₁.