Calculate regional tissue with this tool. dftratio can calculate the regional tissue to reference tissue ratio, which is often used as a robust and model independent index of receptor availability. By default, ratio of AUCs is calculated as
Ratio = Regional AUC(t1..t2) / Reference AUC(t1..t2.
The used parameters are:
1. Tissue TAC file
2. Name of reference region in tissue file, or name of datafile containing the reference tissue TAC
3. Start and end times for AUC calculation (t1 and t2)
4. Result file (existing file is overwritten)
5. Ratio curve file (optional); only for plotting.

Options:
-h, --help
Print this message and exit.
-B Bound/free-ratio is calculated instead of Total/free; reference region TAC is first subtracted from other regional TACs.
-M Bound TAC maximum value is searched between start and end times, and Bound/free ratio is calculated at this time point.
--version or --build
Print software build information and exit
--silent
Program works silently, printing only warnings and error messages
--verbose
Program prints more information about what it is doing.

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