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Mortazavi, S.M.J. and Ghiassi-Nejad, M. and Bakhshi, M. and Jafari Zadeh, M. and Kavousi, A and Ahmadi, J. and Shareghi, A. (2004) Entrance surface dose measurement on the thyroid gland in orthopantomography: The need for optimization. Keywords: Orthopantomography, OPG, panoramic radiography, entrance surface dose, thyroid., 2 (1).