Chris here from the UK. Ive had one so far and due another one following my recent 20 shots of radiotherapy to prostate and 2 lymph nodes in pelvis. Theres a series of 3 videos on Y. tube by Dr Eugene Kwon from Mayo clinic.
The first one covers PET imagining.
Worth watching all 3 if you haven't seen them.
From memory he says for detection of small PC tumours, from their experience at Mayo, PET scans will detect these 6 years before picked up by other scans. So he is a big advocate for using PET particularly for re- occurance and chasing down metastatic PC