ume, expiratory mean lung density (MLD), and expiratory EI -950 (%) and EI -850 (%). The COPD group had a significantly higher EI -950 (%) than the asthma group ( p = 0.008). There were significant differences among the three groups in lumen area (LA), wall area (WA), total area, and Pi10WA. The asthma group had significantly higher WA%/WV% than both the COPD ( p = 0.002) and the control group ( p = 0.012). There was high sensitivity in EI -950 (%), EI -850 (%) and expiratory MLD in the

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... ma and high sensitivity in LA and Pi10WA in small airways in the differential diagnosis of COPD and asthma. Conclusion: To aid the diagnosis, CT can provide quantitative measurements to differentiate between COPD and asthma patients.