ANA PAULA PERINI
12 resultados
Resultados de Busca
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Resumo IPEN-doc 26036 Numerical dosimetry in brachytherapy to variable mama sizes using two different types of 125I seeds2018 - SANTOS, WILLIAM S.; SANTOS, CARLA J.; NEVES, LUCIO P.; BELINATO, WALMIR; CALDAS, LINDA V.E.; PERINI, ANA P.Resumo IPEN-doc 26034 Monte Carlo simulation of microPET/CT occupational exposure using 18F and 68Ga tracers2018 - SOUZA, LUCAS W.G.; POZZO, LORENA; PERINI, ANA P.; BELINATO, WALMIR; SANTOS, WILLIAM S.; CALDAS, LINDA V.E.; NEVES, LUCIO P.Resumo IPEN-doc 26033 Low cost electron irradiator using 90Sr+90Y sources2018 - SILVA, ROGERIO M.V.; BELINATO, WALMIR; SANTOS, WILLIAM S.; PERINI, ANA P.; NEVES, LUCIO P.; SANTOS, CARLA J.; SOUZA, DIVANIZIA N.Resumo IPEN-doc 26030 Simulation of a laboratory for the radiation detectors calibration2018 - AMARAL, CAIO E.S.; LIMA, CAIO L.; BELINATO, WALMIR; NEVES, LUCIO P.; PERINI, ANA P.; SANTOS, WILLIAM S.; ALMEIDA, EDSON P.B. de; NAVARRO, MARCUS V.T.Resumo IPEN-doc 26029 Computational simulation of the detectors designed for computer tomography2018 - LIMA, CAIO L.; AMARAL, CAIO E.S.; BELINATO, WALMIR; NEVES, LUCIO P.; PERINI, ANA P.; SANTOS, WILLIAM S.; ALMEIDA, EDSON P.B. de; NAVARRO, MARCUS V.T.Resumo IPEN-doc 26023 Computational modeling of thyroid shields and lead eyewear and the impact on the absorbed doses of eye lens and thyroid gland in CBCT exams2018 - SOARES, MARIA R.; SANTOS, WILLIAM S.; NEVES, LUCIO P.; PERINI, ANA P.; MAIA, ANA; BELINATO, WALMIR; CALDAS, LINDA V.E.Resumo IPEN-doc 26022 Occupational exposures in PET procedures with 18F-FDG2018 - BELINATO, W.; ALMEIDA, E.P.B. de; NEVES, L.P.; PERINI, A.P.; CALDAS, L.V.E.; SANTOS, W.S.Artigo IPEN-doc 24788 Estimation of conversion coefficients for absorbed and effective doses for pediatric CT examinations in two different PET/CT scanners2019 - PERINI, ANA P.; SANTOS, WILLIAM S.; NEVES, LUCIO P.; BELINATO, WALMIR; CALDAS, LINDA V.E.Normally, during medical procedures, special attention must be given to pediatric patients when compared to adults. This is specially relevant during procedures involving ionizing radiation, as CT scans, given that children are considerably more sensitive to radiation induced stochastic effects than adults. In order to investigate the radiation doses on radiosensitive organs of pediatric patients, undergoing head, chest and abdomen CT procedures, numerical dosimetry was employed in this work. The novelty is the use of a new set of pediatric virtual anthropomorphic phantoms, coupled with Monte Carlo simulation, to determine the conversion coefficients for absorbed and effective doses. Two CT equipment were simulated, taking into account the main characteristics of those commercially available. The results were converted to conversion coefficients (mGy/100 mA) for several organs and tissues, and the highest values were obtained for the newborn phantom. This numerical approach employed a new and reliable technique for pediatric CT dosimetry.Artigo IPEN-doc 24752 Dose estimate for cone beam CT equipment protocols using Monte Carlo simulation in computational adult anthropomorphic phantoms2019 - SOARES, MARIA R.; SANTOS, WILLIAM S.; NEVES, LUCIO P.; PERINI, ANA P.; BATISTA, WILSON O.G.; BELINATO, WALMIR; MAIA, ANA F.; CALDAS, LINDA V.E.Cone beam computed tomography (CBCT) has become essential for dental diagnoses in the last decade. This is supported by its low cost and low doses, when compared to medical CT. Following this increase in CBCT procedures, it is necessary to ensure the image quality within low radiation doses to the patients. This is an especially difficult challenge in CBCT, given the number of equipment models (more than 50), radiographic techniques that may be employed, and technical information not available to the users by the manufacturers. The objective of this study was to estimate the cancer risk, effective and absorbed doses in tissues and organs for CBCT protocols intended for dental use. Monte Carlo (MC) simulations were used to estimate these quantities in tissues and organs with radiological importance, as those suggested by the International Commission of Radiological Protection (ICPR) report ICRP 103. Five different fields of view (FOV) were simulated to i-Cat Classic CBCT, using the MCNPX code. The virtual anthropomorphic phantoms FASH3 (Female Adult MeSH) and MASH3 (Male Adult MeSH) were also used. The effective dose estimative was in the range 75.15–142.20 μSv. The largest contribution to the effective dose was from the salivary glands (17%), thyroid (27%) and remainder tissues (28%). The results of this work showed that the effective and absorbed doses in tissues/organs vary according to the FOV, exposure parameters, and the positioning of the beam, relative to the radiosensitive organs. Furthermore, for the same exposure conditions, women can exceed the total risk of cancer by 26–34%, when compared to men.Artigo IPEN-doc 24798 Exposure to 137Cs deposited in soil – A Monte Carlo study2018 - SILVEIRA, LUCAS M. da; PEREIRA, MARCO A.M.; NEVES, LUCIO P.; PERINI, ANA P.; BELINATO, WALMIR; CALDAS, LINDA V.E.; SANTOS, WILLIAM S.In the event of an environmental contamination with radioactive materials, one of the most dangerous materials is 137Cs. In order to evaluate the radiation doses involved in an environmental contamination of soil, with 137Cs, we carried out a computational dosimetric study. We determined the radiation conversion coefficients (CC) for effective (E) and equivalent (H T) doses, using a male and a female anthropomorphic phantoms. These phantoms were coupled with the MCNPX (2.7.0) Monte Carlo simulation software, for three different types of soil. The highest CC[H T] values were for the gonads and skin (male) and bone marrow and skin (female). We found no difference for the different types of soil.