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Histograms of the scatter-based gray values of the extended lung region of dark-field CT volumes of control (black), emphysematous (red) and fibrotic (blue) mouse. The gray values are scaled according to the novel scatter Hounsfield Units (HUs) introduced in the text. The pathophysiological changes of emphysematous and fibrotic lung cause a shift towards lower HUs. Peaks at 0 HUs correspond to non-scattering solid soft-tissue areas surrounding the actual alveolar lung region.
