Fig. 3. Juxtadiaphragmatic lung computed tomographic scans of pigs during one-lung ventilation (OLV) with a tidal volume (VT) of 5 or 10 ml/kg. In each image, the region of interest includes the following (Hounsfield units in parentheses): overaerated (from −1000 to −900), normally aerated (from −900 to −500), poorly aerated (from −500 to −100), and atelectatic (from −100 to 100) lung areas. The regions are coded by gray scale. There were differences in lung density during ventilation with high or low VTvalues at inspiration.