PET and CT fusion

Slicer version: 4.10.1
Hi 3D Slicer experts and all
I have 2 images, CT and PET. I want to fuse two images together. Which module can I use to do this? can you help me?
Thanks a lot

These instructions should help you getting started: https://slicer.readthedocs.io/en/latest/user_guide/user_interface.html#review-loaded-data. If you have any specific questions then let us know.