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Previous issue date: 2016-07-12 === Objective: To compare the total radiation doses obtained in an optimized protocol tomography (MSCT) for hospital use (CTdBem), with the doses obtained in panoramic radiography for dental use, both in pediatric patients and to compare the actual radiation doses to lens, thyroid, salivary glands and gonads obtained from MSCT x panoramic radiograph.
Methods: radiation dose data obtained were used in examinations of pediatric patients, and children under 18 years of age treated at the University Hospital of Santa Maria (HUSM), who needed dental evaluation by diagnostic imaging methods. The value of the estimated effective dose of radiation was obtained by computational calculations using the data CTDI (Computed Tomography Dose Index) and DLP (Dose Lenght Product) of MSCT and DAP values (Dose Area Product) for panoramic radiography equipment. The organs were: crystalline, thyroid, salivary glands and gonads, and compared the effective doses of radiation obtained for the different equipment. The radiographic examinations were performed using the pan in equipment X-ray Instrumentarium OP200, 57-85kV, 2-16mAs and acquisition time of approximately 11 seconds. For MSCT was used Toshiba Aquilion64 using 120kV, 10mAs but and acquisition time of approximately 6 seconds.
Results: Comparison of DLP CTdBem protocol with panoramic radiograph showed dose values 28,48mSv and 36,45mSv respectively. Comparing the effective doses were found dose values for salivary gland 0,28mSv and 0,36mSv to gonads 2,28mSv and 2,92mSv for thyroid 0,28mSv and 0,36mSv and lens 3, 42mSv and 4,37mSv.
Conclusion and Clinical Relevance: The authors conclude that the total doses and also the effective doses of radiation to lens, thyroid, salivary glands and gonads obtained in an optimized protocol of multislice computed tomography for hospital use (CTdBem) doses were lower based on panoramic radiographs. === Objetivo: Comparar as doses totais de radia??o obtidas em um protocolo otimizado de tomografia computadorizada multislice (TCMS) para uso hospitalar (CTdBem), com as doses obtidas em radiografia panor?mica de uso odontol?gico, ambos realizados em pacientes pedi?tricos e comparar as doses efetivas de radia??o para cristalino, tireoide, gl?ndulas salivares e g?nadas obtidas em TCMS x radiografia panor?mica.
M?todos: Foram utilizados dados de dose de radia??o obtidos em exames de pacientes pedi?tricos e jovens de at? 18 anos de idade atendidos no Hospital Universit?rio de Santa Maria (HUSM), que necessitavam de avalia??o odontol?gica por m?todos de diagn?stico por imagem. O valor da estimativa da dose efetiva de radia??o foi obtido por calculo computacional utilizando os dados de CTDI (Computed Tomography Dose Index) e DLP (Dose Lenght Product) do TCMS e os valores de DAP (Dose Area Product) para o equipamento de radiografia panor?mica. Foram considerados os ?rg?os: cristalino, tireoide, gl?ndulas salivares e g?nadas, sendo comparadas as doses efetivas de radia??o obtidas para os diferentes equipamentos. Os exames radiogr?ficos foram realizados utilizando a panor?mica em equipamento de raios-X Instrumentarium OP200, 57-85kV, 2-16mAs e tempo de aquisi??o de aproximadamente 11 segundos. Para a TCMS foi utilizado o Toshiba Aquilion64 utilizando 120kV, 10mAs e tempo de aquisi??o de aproximadamente 6 segundos.
Resultados: A compara??o da DLP do protocolo CTdBem com radiografia panor?mica mostrou valores de dose de 28,48mSv e 36,45mSv, respectivamente. Quando comparadas as doses efetivas foram encontrados os valores de dose para gl?ndulas salivares de 0,28mSv e 0,36mSv, para g?nadas de 2,28mSv e 2,92mSv, para tireoide de 0,28mSv e 0,36mSv e para cristalino de 3,42mSv e 4,37mSv.
Conclus?o e Relev?ncia Cl?nica: Os autores concluem que as doses totais e tamb?m as doses efetivas de radia??o para cristalino, tireoide, gl?ndulas salivares e g?nadas obtidas em um protocolo otimizado de tomografia computadorizada multislice para uso hospitalar (CTdBem) foram inferiores as doses obtidas em radiografias panor?micas.
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