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Comparison of IPVV between mild and severe COPD in inspiratory and expiratory CT. (A,C) A male with mild COPD (GOLD II, 68 years): a, the IPVV of the whole lung in inspiratory CT is 209.95 ml; b, the IPVV of the whole lung in expiratory CT is 169.10 ml. (B,D) A male with severe COPD (GOLD III, 64 years): a, the IPVV of the whole lung in inspiratory CT is 208.31 ml; b, the IPVV of the whole lung in expiratory CT is 201.18 ml.
