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Fig. 1H —74-year-old woman with multifocal air trapping. Gaussian curve fit
(red) of attenuation difference histogram (blue) of entire
right lung has peak pixel frequency of 4.4%, mean attenuation difference of
117.5 H, SD of 83.0 H, and full width at half maximum of 195.5 H. Area under
the curve percentages for pixel values less than 0, 50, 100, and 200 H
arbitrary threshold attenuation difference values were 6.0%, 16.1%, 36.7%, and
73.9%, respectively.
