If CBCT is not an option, what is your preferred IGRT strategy for prone breast patients?

We have never used CBCT for whole breast prone patients.

Daily lateral MV is our standard approach + weekly ports.

Could consider KV daily, as well.

It's really not ideal in the modern era to do prone breast without CBCT because there's no other way to pick up the variability in subtle rotation, contralateral breast tissue pull, and ipsilateral breast skin shape/taut. Once you see the setup errors picked up by 3D imaging you can't unsee them. Ma...