Doses de radiação efetiva para os pacientes nos exames de tomografia computadorizada realizados no Hospital Naval Marcílio Dias

Abstract

To assess the radiation dose to the patient in computed tomography (CT) performed at the Marcilio Dias Navy Hospital, from the eff ective doses mean values for each type of examination. Methods: A retrospective, descriptive study, through the analysis of radiation dose to the patients undergoing head, chest and abdomen / pelvis CT examinations, from the value of the dose-length product that was subsequently converted into the eff ective dose for each examination. The study was conduct in the multidetector scanner Somatom Sensation 40 slices; Siemens Healthcare, Germany. A descriptive analysis of the data with the presentation of percentages, average and standard deviations values were performed. 95% confidence intervals were built to verify that the average effective doses were within the typical values of effective dose for CT examinations proposed by the American Association of Physicists in Medicine (AAPM) Report # 96. Results: The sample consists of 1,410 examinations, such that 407 were head, 461 chest and 542 abdomen / pelvis. The average effective doses found were 1.55 mSv, 3.87 mSv and 7.75 mSv for head, chest and abdomen / pelvis examinations, respectively. Conclusion: This study identified that the chest examinations were performed with effective doses below the typical values, while the effective doses for head and abdomen / pelvis examinations were within the range provided by the AAPM Report # 96.