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. 2017 May 22;44(7):3594–3603. doi: 10.1002/mp.12274

Figure 1.

Figure 1

Illustration of saber‐sheath trachea across stages. (a) Axial inspiratory scan image showing a saber‐sheath trachea from a GOLD 1 patient (TI = 0.49). (b) Detail view of the tracheal cross‐section in (a). (c) Axial inspiratory scan image showing a saber‐sheath trachea from a GOLD 4 patient (TI = 0.47). (d) Detail view of the tracheal cross‐section in (c). In the detail views, the trachea segmentation is outlined in black. The intersection of the four equiangular rays with the trachea segmentation is highlighted in with grey circles. The white rays represent the distances used for the computation of the TI.