MIRD method with the Stabin/Segars anthropomorphic representations were used to calculate the absorbed doses in kidneys and uterine wall of an early-stage pregnant woman when Tc (DTPA), Tc (DMSA) and Tc (MAG3) are used for renal studies. Stabin and Segars anatomical representations are phantoms that are used in Monte Carlo calculations to determine the SAF, that with the pharmaceutical residence time are used to calculate the absorbed dose, from source organs, on target organs. Concerns about the impact on the absorbed dose due to the use of the three Tc-based compounds as well as the use of different phantoms were here treated for the case of a female at early pregnant state. The lowest absorbed dose in the kidneys was obtained with Tc (MAG3), and the relative difference of using Stabin and Segars anthropomorphic representations was 2.5%. For bladder and rest of organs the relative difference 14.63%. The lowest absorbed dose by uterine wall was obtained with Tc(DMSA), however the relative difference of using Stabin and Segars anthropomorphic representations was 12%.
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