VSAIRW | VisionX V4 |
vsairw - segment the trachea and airways
SYNOPSISvsairw if=<input> of=<output> [og=<v3d>] [sp=<seed>] [-nmf] [-v] [-d] [-w]
DESCRIPTIONvsairw segments the airway lumen area from the whole lung CT scan. It first locates a trachea seed point (vtseed) from the downsampled intensity image (vdown) and a seed intensity threshold. The seed intensity threshold is elevated by 50HU for airway segmentation. Then the intensity image is filtered (median 3x3x1). Finally, the segmentation algorithm (vairseg) takes in the filtered intensity image, the elevated threshold and the trachea seed point and performs airway tree segmentation and carina detection.
In case of an invalid segmentation (vairseg error or volume > 2000000mm^3 or volume < 5000mm^3 or carina not detected or main bronchi not segmented), two additional attemps are allowed with a new threshold (seed threshold + 100 and +150). If still unsuccessful, program reports an error and exits.
A small closing (s=3) is performed on the segmentation outcome. Then based on the detected carina location, trachea and bronchi are labeled.
CONSTRAINTInput must be a short image of a whole-lung CT scan.
OPTIONS|
if= |
input whole lung CT scan |
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of= |
output map of trachea and bronchi |
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og= |
output polygon image of airway tree |
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sp= |
coordinate of the seed point (x,y,z) |
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-nmf |
no median filtering on intensity image |
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-v |
verbose mode |
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-w |
wish format |
vairseg(1)
AUTHORJ. Lee