![]() Six-dimensional image registrations were performed on CBCT and ExacTrac, and residual errors calculated from CBCT and ExacTrac were compared. CBCT and ExacTrac x-ray images were taken at each patient’s treatment position. The patient study included thirteen patients. CBCT and ExacTrac x-ray images were taken when the phantom was located at each isocenter. Ten isocenters were selected at various locations in the phantom, which represented clinical treatment sites. The phantom study was based on a Rando head phantom, which was designed to evaluate isocenter-location dependence of the image registrations. Method: Phantom and patient studies were performed on a Varian TrueBeam STx linear accelerator (Version 2.5), which is integrated with a BrainLab ExacTrac imaging system (Version 6.1.1). Purpose: To compare online image registrations of TrueBeam cone-beam CT (CBCT) and BrainLab ExacTrac x-ray imaging systems for cranial radiotherapy. Li, J Shi, W Andrews, D Werner-Wasik, M Lu, B Yu, Y Dicker, A Liu, H [Thomas Jefferson University Hospital, Philadelphia, PA (United States) SU-F-J-42: Comparison of Varian TrueBeam Cone-Beam CT and BrainLab ExacTrac X-Ray for Cranial RadiotherapyĮnergy Technology Data Exchange (ETDEWEB)
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