VAIRMEA | VisionX V4 |
vairmea − measures an airway segment
SYNOPSISvairmea if=<mfile> ig=<mfile> [ih=<imgfile>] [of=<imgfile>] [og=<imgfile>] [oh=<imgfile>] [cf=<outfile>] [hp=<hpfile>] [st=<thresh>] [si=<interval>] [d=<dist>] [px=<x3,x2,x1,x0>] [py=<y3,y2,y1,y0>] [pz=<z3,z2,z1,z0>] [sc=<xs,ys,zs>] [-m] [-w] [-v]
DESCRIPTIONvairmea measures lumen diameter and wall thickness for a given airway segment. The input to the program is the airway mapped to a cylinder model (using vairmap). [if=] is the mapping from the original CT image, and [ig=] is the mapping from the binary mask of the airway. Sampled interval (si=) and distance (d=) parameters must match the values that were used by vairmap.
When measuring wall thickness, skewness reduction is performed to reduce the effect of adjacent structures. Skewness threshold (st=) specifies how much reduction should be done (default=0.05).
The measured dimensions of the airway may be displayed using -w or -v flags.
The measured points may be visualized in three different ways. [og=] is a reconstructed image showing sliced views of the segment. [oh=] is a reconstructed image oriented axially along the segment. [of=] is a original CT image annotated with the wall locations.
For [og=] and [oh=], using -m option will annotate the image with the measured wall locations. When using [of=] output, four additional parameters must be specified: [px=],[py=],[pz=], and [sc=]. These parameters must match the values used by vairmap. See vairmap man page for description of these parameters.
SH OPTIONS
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if= |
cylinder-mapped airway segment | ||
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ig= |
CT image (for mapping back) | ||
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ih= |
cylinder-mapped binary airway segment | ||
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of= |
output original CT image with annotated wall locations | ||
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og= |
output reconstructed image in slice view | ||
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oh= |
output reconstructed image in axial view | ||
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cf= |
output color-coded cylinder according to wall thickness | ||
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hp= |
output color-coded cylinder according to wall thickness | ||
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st= |
skewness threshold for wall thickness measurement | ||
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si= |
sampled interval (mm), default=0.01 | ||
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d= |
maximum distance (mm), default=15 | ||
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px= |
polynomial coefficients for ’x(t)’, for of= output | ||
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py= |
polynomial coefficients for ’y(t)’, for of= output | ||
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pz= |
polynomial coefficients for ’z(t)’, for of= output | ||
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sc= |
scale (mm/pixel) <xs,ys,zs>, for of= output | ||
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-m |
show reconstructed images with annotations | ||
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-w |
wish output | ||
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-v |
verbose mode |
vairmap, vfitpoly, vcylmodel
AUTHORJ. Lee