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The common methods for patient dose estimations in computed tomography (CT) are thermoluminescence dosemeter (TLD) measurements or the usage of software packages based on Monte Carlo simulations like CT-Expo or the newer CTVoxDos, which uses the ICRP Reference Adult Male (ICRP 110). Organ (OD) and effective doses of a CT protocol of the upper abdomen are compared. Compared to CTVoxDos, ODs inferred by TLD measurement using an anthropomorphic phantom differ by   $\mathbf{(19\pm 16)\,\%}$   inside the primary radiation field,   $\mathbf{(14\pm 2)\,\%}$   for partially primary irradiated organs and   $\mathbf{(34\pm 38)\,\%}$   in the scattered radiation field. ODs estimated by CT-Expo show a mean deviation of   $\mathbf{(16\pm 9)\,\%}$   (primary irradiated) and   $\mathbf{(28\pm 31)\,\%}$   (scatter irradiated) from ODs estimated by CTVoxDos.

COMPARISON OF EXPERIMENTAL AND NUMERICAL METHODS OF PATIENT DOSE ESTIMATIONS IN CT USING ANTHROPOMORPHIC MODELS