No PET CT scan before treatment starts?

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Hi - quick question before I go for my mask made! I expected to have a PET CT scan before treatment started so they know exactly where to target. But the nurse told me that the oncologist said they have what they need from the MRI and the CT (with contrast) scans. He said it would be important to do a PET scan after treatment to see if it's worked.  Does this sound right? What will they have to compare it to and how do they know where to target, as they'll have no 'hot spots of activity' without the PET scan beforehand. 

Anyone else not had a PET scan before treatment started? Thanks!

Helen x