No MRI

Apparently the radiologist changed the order of an MRI to a CT scan because it would better show possible hernia and my surgeon approved it but they forgot to call me.  So I go to get MRI and they wanted to do a CT but I'm having a PET CT in a month so I said no I dont want more radiation.  I have a call in to oncologist to find out why I'm even getting a PET instead of a CT.  RI hospital says that the PET can not give the cut they need to see possible hernia but CT can.  Very annoyed, awaiting call back.