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Fig. 1C —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 less than
–860 H in expiratory CT (red). Relative volumes for whole lung
with attenuation value less than –860 H are calculated as follows:
relative volume on inspiratory CT (inspiratory relative
volume<–860) = (red in B)/(blue
in A), and relative volume on expiratory CT (expiratory relative
volume<–860) = (red in C)/segmented
whole-lung volume on expiratory CT. Relative volume
change<–860 (%) = expiratory relative
volume<–860 – inspiratory relative
volume<–860.
