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 Indian J Med Microbiol  
 

Figure 1 (A and B): (A) Axial CT image of a 65-year-old male with COPD shows multiple low attenuation areas with imperceptible wall in bilateral lung fields. (B) Axial CT image with application of density mask technique in the same lung fields as in (A). Total area with CT attenuation <950 HU are depicted in green. To quantify the LAA%, percentage of total lung field occupied by voxel with CT attenuation −950 HU or lower were calculated from CT data

Figure 1 (A and B): (A) Axial CT image of a 65-year-old male with COPD shows multiple low attenuation areas with imperceptible wall in bilateral lung fields. (B) Axial CT image with application of density mask technique in the same lung fields as in (A). Total area with CT attenuation <950 HU are depicted in green. To quantify the LAA%, percentage of total lung field occupied by voxel with CT attenuation −950 HU or lower were calculated from CT data