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CT densitometric measures of emphysema. A, Coronal slice of a normal lung and the distribution of Hounsfield units (HU). Note that the mean HU values for various lung zones (blue, green, and yellow lines) and whole lung (red) are approximately –850. B, Coronal slice of an emphysematous lung. Note that the HU values are now shifted toward –1,000 HU, the density of air.
