6) ICRP, 1973. Implications of Commission Recommendations that Doses be Kept as Low as Readily Achievable. ICRP Publication 22. Pergamon Press, Oxford.
7) J. T. Bushberg, J. A. Seibert, E. M. J. Leidholdt, et al : The essential physics of medical imaging. Williams and Wilkins, Baltimore, 1994.
11) Lin P. J, Beck T.J, Caridad B, et al : AAPM Report No. 39-Specification and acceptance testing of computed tomography scanners. 1993.