Mouse Brain, CT-PET-Atlas workflow.
1. Load Atlas once for the whole study session. Minimize the View, so it is out the way and reduce screen clutter. You don't need to open Atlas for every registration.
2. Load CT-3D volume with landmarks present
3. Load PET-4D volulume
(steps 2,3 in any order)
4. Choose "MainMenu>Applications>Mouse Brain Atlas-PET-CT workflow"
5. After brief processing only one document will remain that contains
CT,PET and several ROI layers.
6. Press F4 to bring up the curve dialog, this might take up to 1 min since there are many ROIs present. You will see something like below:

