Calculate standard deviation between regional TACs with this tool. dftstd can calculate standard deviation between regional TACs, separately for each time frame. With options -S and -C either SD (default) or CV can be computed.

Usage: dftstd [Options] <Datafile> <SD file>

Options:
-SD
SD is calculated (default)
-CV
CV is calculated
-AVG=<filename>
Also average curve is calculated and written in specified file
-h or --help
Print this message and exit
--version or --build
Print software build information and exit
--silent
Program works silently, printing only error and warning messages
--verbose
Program prints lots of information about what it is doing.

The license of this software is Freeware, you can free download and free use this calculator software.