VNDETX | VisionX V4 |
vndetx − select high probability candidate nodules
SYNOPSISvndetx [i=] [n=] [s=] [t=] [if=] [of=] [cf=] [-r] [-v]
DESCRIPTIONvndetx takes the output nodule candidate feature file (if=) from the SVM classifier (used in vdetect) and selects the high probability candidates. If input file if= is not specified, the default input file is {image-given-name}ndet.cf. The output nodule location file is of= . If output file of= is not specified, the default output file is {image-given-name}loc.txt. If t= is specified, the minimum distance to the svm hyperplane is set to the specified input value. Otherwise the minimum distance is set to 1.15.
Candidates are first selected based on their distance to the SVM hyperplane; only candidates with a distance greater than the minimum distance will be selected.
Second, if s=<size> is specified, the output from previous step is further filtered based on having a diameter greater than size (mm), i.e. only candidates with a size greater than or euqal to s= will be selected.
Third, if n=<max-candidates> is specified, only the top n candiates from the previous selection will be output.
After candidate selection, if cf= is specified, the selected candidates’ features (from svm classifier) will be output in cf= .
The -r flag specifies a relaxed set of conditions for the first (SVM) criterion. This setting has been found to be useful by observation for CT scans with large slice thickness ( > 1.25 mm) that do not match the current SVM training set. For the -r option three types of candidates are selected:
(1) all nodule candidates that have a hyperplane distance greater than the minimum (default operation);
(2) nodule candidates that have a distance greater than -0.2 and a diameter greater than 4.0 (mm);
(3) nodule candidates that have a distance greater than -2.0 and a diameter greater than 5.0 (mm).
OPTIONSi=<file-name>
The image given name.
n=<number>
This parameter specifies the maximum number of candidates to be output.
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s= |
This parameter specifies the minimum size for a candidate in mm. |
t=<distance>
This parameter specifies an output candidate’s minimum distance to svm hyperplane.
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if= |
Input feature file (output from vdetect svm classifier). Default is {$i}ndet.cf. | ||
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of= |
Output file with selected candidate nodules’ locations. Default is {$}loc.txt. | ||
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cf= |
Output file with selected candidates’ features (from vdetect svm classifier). | ||
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-r |
This parameter relaxes the minimum distance to hyperplane to allow more nodules to be selected (useful for thick slice scans). | ||
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-v |
verbose mode |
vdetect(1)
AUTHORA. P. Reeves, Y. Xie