PO-0893: Improving CBCT image quality for daily image guidance of patients with head/neck and prostate cancer. - Chetty, I.; Paysan, P.; Siddiqui, F.; Weihua, M.; Brehm, M.; Messmer, P.; Maslowski, A.; Wang, A.; Seghers, D.; Munro, P. (Radiotherapy & Oncology, 2017)