What is your preferred IGRT approach when treating with ultra-hypofractionation for breast cancer?

If ultra-hypofractionated PBI, we do daily CBCT.

If ultra-hypofractionated WBI, we do ports once during course. Exception is if we use an SIB boost.

Also, regardless of laterality, we use DIBH for ultra-hypofractionated PBI and WBI.

We do daily port imaging as well.

We do daily tangent port film.