K. Krongyuth, C. Kakanaporn, L. Apipunyasopon, P. Liammookda, W. Boonrat, and S. Vinijsorn, “Investigation of Dose Delivery from On-Board CBCT for Head and Pelvis Regions”, J Thai Assn of Radiat Oncol, vol. 16, no. 2, pp. 28–35, Dec. 2010.