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Figure 20. Orthographic volume rendering of the airways. Volume-rendered image of a patient with tracheal stenosis (arrow) includes the airway from the hypopharynx to just above the carina. The image is not distorted by proximity or angle of the viewpoint and provides an "external" view of anatomic relationships. Segmentation of the airways was achieved by assigning a spike in opacity at the interface between air and soft-tissue attenuation. Overlying lung tissue was removed with region-of-interest editing to avoid obscuring the trachea.
