Fig. 4

The coronal section of CT images crossing brain, esophagus, and trachea (n, a-d) with CT values plots for selected regions (a: bone, b: brain, and c-d: esophagus). n, a, b, c, and d correspond to the five scans as described in Figs. 1, 2 and 3. The identified CT values in E, F show similar CT values for the bone and brain (a-b), but clearly different values for the esophagus (c-d) over the staining. The same color regime was adopted for the CT plots. Anatomical abbreviations: Esph, esophagus