What PTV margins do you use for definitive prostate radiation?

I tend to follow the RTOG/NRG trials' guidelines for each clinical situation when deciding on margins from CTV to PTV (which use progressively tighter margins based on whether one is doing standard, moderate hypo-, or extreme hypo-fractionation):

For conventional fractionation, RTOG 0924 states 0.5-...

In my opinion, the PTV should always be tailored to the situation and the steps that have been taken to minimize intra-fractional motion assuming daily imaging

In our department for modest hypofractionation and standard fractionation for an intact prostate, we sim with a 3 mm slice CT , intra-prosta...