Avaliação dos níveis de referência de dose no estudo tomográfico do tórax
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Data
2011
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Edições Universitárias Lusófonas
Resumo
Este estudo foi realizado num Hospital, em Lisboa, onde foram avaliados 30 exames tomográficos de tórax. Com a realização
deste trabalho, pretendeu-se quantificar o nível de referência de dose num dos equipamentos de TC de um Hospital de Lisboa,
incidindo na avaliação do estudo do tórax. Pretendeu-se ainda, quantificar um valor médio para as grandezas dosimétricas em
tomografia computorizada, nomeadamente o CTDIw, DLP e dose efectiva e, comparar postenormente, os valores obtidos, com
osníveis de referência de diagnóstico regulamentados pelo ICRP.
O nível de referência de dose obtido do Hospital, para os exames estudados foi 1 3,67 mGy. A média de CTDIw foi 12,18 mGy,
a média de DLPcorrespondeu a 291,49 mGy.cm e, amédia de dose efectiva apurada foi 4,95 mSv.
Com este estudo constatou-se também, que previsivelmente, existe um risco baixo de ocorrência de cancro ou de efeitos
hereditários graves em todos os indivíduos da amostra, e que a dose efectiva recebida em cada exame corresponde,
aproximadamente, a uma exposição de radiação equivalentea 2,06 anos de radiação natural.
This study was performed in a Hospital m Lisbon, where 30 CT chest scans were evaluated. With this work, we sought to quantify the dose reference level of CT equipment in an hospital focusing the study on the thorax evaluation. It was also intended to quantify an average value for the CT dosimetric quantities, including CTDlw, DLP and effective dose, and then, to compare obtained values with diagnostic reference levels regulated by the ICRP. The dose reference level obtained m the Hospital, for the studied exams was 13, 67 mGy. The average CTDlw was 12, | 8 mGy, the mean DLP corresponded to 291, 49mGy.cm and the average effective dose found was 4, 95 mSv. This study also allowed to conclude, as predicted, that there is a low risk of cancer occurrence or severe congenital effects in all individuals of the studied sample, and that the effective dose received in each test corresponds approximately to a radiation exposure equivalent to 2,06 years of natural radiation. The average value of all dosimetric quantities did not exceed the limits set by the ICRP.
This study was performed in a Hospital m Lisbon, where 30 CT chest scans were evaluated. With this work, we sought to quantify the dose reference level of CT equipment in an hospital focusing the study on the thorax evaluation. It was also intended to quantify an average value for the CT dosimetric quantities, including CTDlw, DLP and effective dose, and then, to compare obtained values with diagnostic reference levels regulated by the ICRP. The dose reference level obtained m the Hospital, for the studied exams was 13, 67 mGy. The average CTDlw was 12, | 8 mGy, the mean DLP corresponded to 291, 49mGy.cm and the average effective dose found was 4, 95 mSv. This study also allowed to conclude, as predicted, that there is a low risk of cancer occurrence or severe congenital effects in all individuals of the studied sample, and that the effective dose received in each test corresponds approximately to a radiation exposure equivalent to 2,06 years of natural radiation. The average value of all dosimetric quantities did not exceed the limits set by the ICRP.
Descrição
Biomedical and biopharmaceutical research : jornal de investigação biomédica e biofarmacêutica
Palavras-chave
MEDICINA, TOMOGRAFIAS, TÓRAX, RADIAÇÃO IONIZANTE, RAIOS X, NÍVEIS DE REFERÊNCIA DE DIAGNÓSTICO, MEDICINE, TOMOGRAPHIES, THORAX, IONIZING RADIATION, X-RAYS, RADIOTHERAPY DOSAGE, DOSE DE RADIAÇÃO, DIAGNOSTIC REFERENCE LEVELS