By default, the PET/CT application starts up with a default windowing level for PET images and for CT images. For PET series, the windowing preset value Normal is automatically applied, while for CT series the windowing value is read from its DICOM tags. You can change the PET windowing value in Application Settings --> Windowing Presets.
Synchronization:
Changing the PET image windowing level affects the PET component in the fusion image and the MIP image
Changing the CT image windowing level affects the CT component in the fusion image.
If prior studies are displayed, all registered series are windowed together.
NOTE: It is possible to configure the PET and Fusion groups to display a bar with a slider allowing you to change the minimum and maximum windowing values. See your system administrator.