Dosimetric evaluation in panoramic and teleradiography procedures / AvaliaÃÃo DosimÃtrica em procedimentos de Radiografia PanorÃmica e Teleradiografias

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The present work had as an objective to evaluate the skin surface entrance dose in panoramic and teleradiography procedures in three clinics in Recife - Pernambuco - Brazil, and to contribute with data for the determination of reference levels for supercited extraoral procedures, for this purpose, operational conditions in 3 clinics were evaluated in Recife, aiming to evaluate the existence and integrity of the radioprotection equipment, manner and conditions of image processing; and radiographic equipment parameters such as the dimension of the irradiation filed, the total filtration, the exposure time and the potential applied to the X ray tube. For an estimation of the skin entrance dose of the patient, the phantom Randon Alderson and thermoluminesence dosemeters were used. From these values and the conversion factors determined by the Monte Carlo technique, with the phantom MAX it was possible to estimate the dose absorbed in the organ due to the teleradiography procedures. Regarding panoramic radiography the study showed that the more elevated doses occurred in the parotid gland region which is near rotacional venters In the case of teleradiography the highest dose value occurred in the regions corresponding to the temporal lobe of the brain, followed by linfonodes, ears and parotid glands. The doses absorbed in the eyes and the tyroid gland were, 0.037 mGy and 0.002 mGy in Clinic A and 0.062 mGy and 0.003 mGy in Clinic C, respectively. Regarding equipment test, inadequacy was found in the beam collimation in Clinic A and in the reproducibility of the X ray exposure in Clinic C. The total filtration in both clinics was inadequate

ASSUNTO(S)

dosimetria teleradiografia teleradiography fisica nuclear radiografia panorÃmica dosimetry panoramic radiography

ACESSO AO ARTIGO

Documentos Relacionados