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Finally, a voxel model was developed by segmenting computed tomography images of the phantom and implemented in PENELOPE\/penEasy Monte Carlo code to compare phantom tissue-equivalent materials with materials from ICRP Publication 89 in terms of organ dose. PMMA equivalence varied depending on tube voltage, from 9.5 to 10.0\u00a0cm and from 13.5 to 13.7\u00a0cm, for the lungs and mediastinum regions, respectively. For the survey, close agreement was found between the phantom and the patients\u2019 median values (deviations lay between 8% and 14%). Differences in lung doses, an important organ for optimization in chest radiography, were below 13% when comparing the use of phantom tissue-equivalent materials versus ICRP materials. 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