Fig. 3
Hounsfield units (HUs) within different lung areas. Exemplary representation of the frequency of different HUs in the lungs of a COVID-19 patient (blue) from this study. For comparison, a healthy control (green) is included. The dashed vertical lines indicate the HU intervals used to subdivide the lungs into regions of different aeration conditions: hyperinflated, normally aerated, poorly aerated, and nonaerated15. The frequency of HUs in the different areas differs between the two cases shown. While for the healthy controls (green), most HUs fell within the range of normal aeration, the COVID-19 patients exhibited a broader distribution extending into regions associated with poor and no aeration. HU: Hounsfield units.
