VASEG

vaseg − aorta segmentation.

vaseg if=<CTimage> map=<LabelMap> fat=<fatMap> car=<carina> of=<output> [-v] [-d]

vaseg vaseg finds a seed point inside the aortic lumen (vaorta), tracks the aorta upward (vatrk with -u) and downward (vatrk with -d or -g) and generates a set of center points. Then the center points of both upward and downward tracking are combined and broken into segments (vveccom). A polynomial function is fit to each segment (vapoly) and a triangular model is built (vcylmodel). Then the original CT image and the label map image are mapped to the triangular model (vairmap) and they are used to determine the surface point (vamea).

Note that (1) when used together with the directional filter program (vdirseg), vaseg only performs ascending tracking since descending tracking is already performed in vdirseg (for coronary region estimation before directional filtering). (2) if descending aorta is too short (less than 20 center points), descending tracking is performed again starting from a new seed point (located 10 slices under the carina slice). (3) if ascending aorta intersects with the descending aorta, ascending tracking is performed again with a slightly smaller search space for the tracking angle.

Input if= should be the original CT scan. Input map= should be a standard label map with segmented lungs, airway, fat and bone. Input fat= is the output map from directional filtering (vdirseg). car= is the carina location from label.en. Output of= is the segmented aorta with different segments in different labels.

vaorta(1), vatrk(1), vveccom(1), vcylmodel(1), vapoly(1), vairmap(1) vamea(1), vadia(1)

Y. Xie