The next most popular imaging machine is the ultra-sound. It is the same as the ultra-sounds that you are familiar with for human diagnostics. These use sound waves help create images so vets can get internal information in a non-invasive way.
CT Scans show the different densities of tissue and create a more detailed image than an X-ray. Cats and dogs will not lay still in a CAT scan machine, so they will have to be sedated for this too.
MRI’s use magnetic fields to create images; which the vet will use to diagnose issues or potential problems that your cat or dog might have. Pet owners and Vets prefer not to use the costly MRI machines because cats and dogs would have to be sedated, where possible X-Rays are preferred.