What is the Imaging Protocol Following Completion of PRRT Therapy?

Is there an imaging standard for monitoring treatment efficacy?
Was a protocol developed as a result of NETTER clinical trials?
E.G.
1. modality
2. when
3. when repeated
I do understand that Ga and Cu PET scans do not quantify lesion size but are very valuable in revealing tumor radiation uptake (SUV's).
It seems reasonable to certainly include the Ga or Cu PET's
Many thanks,
Mark