Figure 3.

Example of the airway and cavity detection algorithm. (a) Roughly identified candidate groups, generated by thresholding and connected component analysis, with bounding boxes. (b) and (c) Two views showing locations of different structures within the body region. (d) Detected airway (1) and cavities (2) are rendered. Note that a possible false positive (3) can be seen if lung segmentation is not conducted as a preprocessing step.