Nitra Piyavisetpat, Patiwat Thaksinawisut and Monravee Tumkosit
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, United Kingdom) with scanning parameters as follows; 0.75 mm collimation, slice thickness 1 mm, 100 kVp, 134 mA, and 0.625 mm collimation, slice thickness of 1 mm, 120 kVp, 165 mA, respectively. Images were acquired with 8 sequential axial slices; 4 slices on full inspiratory phase and other 4 slices on full expiratory phase to assess the degree of air trapping. The slices were performed at 4 levels: at the top of the aorticarch, at the carina, at the right inferior pulmonary vein, and at 2 cm above the right hemidiaphragm. Before scanning, participants were provided