Calculate AUC with this tool. dftinteg help you calculate an AUC (integral over time) from regional or plasma TACs.

Usage:
dftinteg [Options] <DFT file> <Start time> <Integration time> <AUC file>

Enter the start time and integration time in the same units that are in the DFT file. Note that 3rd argument is not the integration end time. Program will automatically set the integration start time and duration based on the time range in the TAC file, if both are set to zero.

Options:
-avg
Average during specified range is calculated instead of AUC
-h or --help
Print this message and exit
--build
Print software build information and exit
--silent
Program works silently, printing only error and warning messages.

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