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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.