Radiation Dose Measurements around Patient in Computed Tomography Imaging
2019
Osman GUNAY | Mustafa DEMIR
Ionizing radiation is intensively used in diagnostic medical imaging and Computed tomography (CT) is the most requested among the modalities. During exposure, X-rays are usually scattered from the patient and the system according to the radiation physics laws. Thus, estimation of the received dose caused by the scattered radiation is important for the patients, patients' companions and the healthcare workers. The aim of this study was to determine the radiation dose from the patient s body and various materials in the environment during CT imaging. In this study, chest and head and neck CT scans were performed on human tissue equivalent Alderson Rando phantom. During CT imaging, radiation dose measurements were achieved by thermoluminescent dosimeters (TLD) placed at distances of 10, 20, 30 and 40 cm from the phantom. In chest CT imaging, the mean radiation dose to the environment ranged from 6.75 +- 1.07 nSv to 21.68 +- 1.45 nSv. While, Head and neck imaging led to radiation dose ranged from 8.38 +- 0.81 nSv to 26.57 +- 0.98 nSv. The exposure danger of the accompanying individuals was found to be minimal and below the permissible limits.
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