Analyze ECAT 7 files with this tool. ecatssum can calculate sum over specified frames or time interval in ECAT7 format 3D sinogram files.
Sinogram data are treated as matrices and the original data format and header information are maintained. Software is optimized for large 3D sinogram files.

Usage:
ecatssum [options] <dynamic scn> <start frame> <end frame> <sum scn>

Options:
-t -T start frame and end frame are given in milliseconds
-f -F force command line frame definition over main header frame info
-s -S run in silent mode
-h -H print usage and exit
-v -V print build information and exit

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