Use regions-of-interest to select a sub-set of tracks from a given track file.
Each region-of-interest should be either the path to a binary mask image, or a comma-separated list of 4 floating-point values, specifying the [x,y,z] coordinates of the centre and radius of a spherical ROI.
| -include spec | specify an inclusion region of interest. Tracks that enter ALL such inclusion ROI will be included. 
| spec | specifies the parameters necessary to define the ROI. |  | 
| -exclude spec | specify an exclusion region of interest. Tracks that enter ANY such exclusion ROI will NOT be included. 
| spec | specifies the parameters necessary to define the ROI. |  | 
| -minlength value | the minimum length of a track. Tracks shorter than this value will NOT be included. 
| value | the minimum length to use in mm. |  | 
| -invert | invert the matching process, so that tracks that would otherwise have been included are now excluded and vice-versa. | 
| -nomaskinterp | do NOT perform tri-linear interpolation of mask images. | 
| -info | display information messages. | 
| -quiet | do not display information messages or progress status. | 
| -debug | display debugging messages. | 
| -help | display this information page and exit. | 
| -version | display version information and exit. |