Document Type: Original Paper
Department of Medical Physics, Lorestan University of Medical Sciences, Khorram Abad, Iran
Student Research Committee, Lorestan University of Medical Sciences, Khorramabad, Iran
Student Research Committee, Dezful University of Medical Sciences, Dezful, Iran
Background: Dental panoramic radiography (DPR) is one of the most frequent diagnostic x-ray procedures and is currently on the rise. During DPR, several radiosensitive tissues such as the lens of the eyes, parotid and thyroid gland are contributed to the radiation field and it is necessary to monitor their received dose. The aim of this study was to evaluate the radiation dose to the lens of the eyes, parotid and thyroid gland in patients undergoing DPR at Lorestan Province, Western Iran.
Material and methods: This cross-sectional study was performed on 180 patients of both genders referred to DPR at two most crowded hospitals of Khorramabad, Iran. The radiation dose measurements were carried out using LiF (Mg, Cu, P) thermoluminescent dosimeters (TLDs). To measure the absorbed dose received by the lens of the eyes, parotid and thyroid gland in each patient, five sets of three TLDs, wrapped in a thin plastic bag, were positioned over each eyelid and the anatomical position of the parotid and thyroid glands and then exposures were carried out. TLDs were read within 24 hours of exposure.
Results:The mean absorbed dose received by the lens of the eyes, parotid and thyroid gland were obtained 155, 160 and 72 µGy for the TE hospital and 24, 558 and 56 µGy for the SA hospital, respectively. Statistically significant differences were observed between organs located outside and inside of the primary beam (P