@cheriels
I did have a PET/MRI scan last year. I don't know the difference between a PET/MRI and PET/CT so please ask your doctor about this and to explain why it's ordered.

I'm very claustrophobic and I did know that the MRI scanner is a long tube you slide into and I figured I'd get very anxious. So I asked for sedation. That helped a lot. If your scan is the CT scan then there is a big open ring that you slide in and out of. I just had a CT for my checkup at Mayo and it was very comfortable and easy for me.

The PET/CT or PET/MRI is done to see if there is cancer anywhere else. Your doctor will want to know that because the results will help guide the treatment. When I had the PET/MRI last year I got the results back very quickly which I appreciated.

Have you written your questions down to ask your doctor? That will help keep you focused and make sure all of your questions get answered.