Comparison Of Fiducial -based 2D kV Orthogonal Imaging, Fiducial-based CBCT And Soft Tissue-based CBCT Registration For Patient Positioning Correction In Image Guided Radiation Therapy For Prostate Cancer

To assess the intra-observer reproducibility of fiducial-based 2D orthogonal kV imaging, fiducial-based-cone beam CT (CBCT) and soft tissue-based CBCT image registration for daily localization of prostate in radiation therapy. Daily orthogonal kV images and CBCT volumetric images were acquired before setup for patients with three intraprostatic fiducial markers on a prospective IRB approved protocol. Shifts in the anterior-posterior (AP),...