%0 Journal Article %T Independent Six-degree-of-freedom Accuracy Evaluation of BrainLab ExacTrac Dynamic and Varian CBCT Systems in Stereotactic Radiotherapy Using a Couch-based Reference %A YALMAN, D. %A TAVLAYAN, E. %A HAZERAL, Y.Z. %A OLACAK, N. %A KAMER, S. %J Turk J Oncol %D 2026 %V 41 %P 018-027 %R 10.5505/tjo.2025.4737