Test your ECAT files with this tool. ecatadd can test and simulate ECAT files. This program also adds the contents of file2 to file1 as new plane(s) and writes combined data as a new file.
This utility is command prompt based so dont expect any fancy graphical user interface to guide you through the process. ECAT 7 format is the format that ECAT HR+ produce and its the format that most analysis programs can analyze in terms of PET image data.

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