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Fig. 1F —74-year-old man with chronic obstructive pulmonary disease. Three-dimensional images, anterior view, reconstructed from inspiratory and expiratory MDCT. Segmented lung volume with attenuation values between –860 and –950 H at upper threshold of –860 H on expiratory CT (green). Relative volume for limited lung is obtained as follows: relative volume on inspiratory CT (inspiratory relative volume_860–950) = (green in E)/(yellow in D), and relative volume on expiratory CT (expiratory relative volume_860–950) = (green in F)/segmented limited-lung volume on expiratory CT. Relative volume change_860–950 (%) = expiratory relative volume_860–950 – inspiratory relative volume_860–950.