PD-0309: Comparison of CBCT based synthetic CT methods for adaptive proton therapy. (November 2020) - Thummerer, A.; Zaffino, P.; Meijers, A.; Marmitt, G. Guterres; Seco, J.; Steenbakkers, R.J.H.M.; Langendijk, J.A.; Both, S.; Spadea, M.F.; Knopf, A.C.