Hey @stew80
I haven't looked into it too much, I'll just add that what your team is moving towards seems to be fairly standard, it may have something to do with the cost of the PSMA PET scan. The insurance folks may not like it until after first round of treatment. (I had to fight to get mine paid for at all).

My docs did exactly what yours are trying to do. An MRI with contrast and a bone scan before treatment. After BCR, then my team did the PSMA PET scan to see if they could find out what was going on. My uneducated guess is that they want to do the CT since they've already done an MRI and it was negative.