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• W837490965 abstract "The aim of this work was to optimize computed radiography techniques of skull and chest for pediatric patients between 1 and 5 years old. To achieve this goal, pediatric homogenous phantoms were developed from retrospective computed tomography (CT) scans. In this procedure, a computational algorithm was used to quantify the average thickness of biological tissue (lung, fat, soft and bone tissue) present on the anatomic region under study. These thicknesses were converted into simulators materials (Lucite and aluminum) to build the homogeneous phantoms of skull and chest. The relative uncertainties in the quantification process of skull examinations were 3.5% for soft tissue and 9.5% for bone tissue. In the chest examination, the relative uncertainties were 19.4% for lung tissue, 13.0% for soft tissue and 20.0% for bone tissue. The chest phantom was constructed with 7.3 cm of lucite distributed in four plates of the same thickness (15.0 x 15.0 x 1.82) cm3 arranged in two pairs, separated by a spacing of 2.86 cm of air. Two aluminum plates (15.0 x 15.0 x 0.13) cm3 and (15.0 x 15.0 x 0.10) mm3 were inserted, respectively, between the upper and lower pairs of Lucite. The skull phantom was constructed with 11.98 cm of Lucite distributed in five plates of the same thickness (15.0 x 15.0 x 2.33) cm3. Two aluminum plates (15.0 x 15.0 x 0.16) cm3 and (15.0 x 15.0 x 0.12) cm3 were inserted between the upper and lower pairs of Lucite. These homogeneous phantoms were used in the optimization process for CR systems to determine test techniques (kVp and mAs combination), which produced levels of exposure around 1.96 lgM. The test images, obtained in this process, were used in the determination of physical parameters such as the effective detective quantum efficiency (eDQE) and contrast-detail. These parameters were associated with the optimal images of skull and chest for adult patients obtained in previous studies. Optimal images obtained in this study, according to the ALARA principle (As low As Reasonably Achievable) determined Gold Standard (GS) pediatric techniques for skull and chest." @default.
• W837490965 created "2016-06-24" @default.
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• W837490965 date "2014-07-31" @default.
• W837490965 modified "2023-09-23" @default.
• W837490965 title "Construção de fantomas homogêneos pediátricos de crãnio e tórax para otimização de imagens em radiografia computadorizada" @default.
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