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KMID : 1151820200140020169
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Journal of the Korean Society of Radiology
2020 Volume.14 No. 2 p.169 ~ p.178
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Assessment of the Effective Dose to the Human Body and Estimation of Lifetime Attributable Risk by CT Examination
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Cho Yong-In
Kim Jung-Hoon
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Abstract
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The number of CT scans is increasing every year due to the improvement of the medical standards of the public, and thus the annual dose of medical radiation is also increasing. In this study, we evaluated the effective dose of the human body exposed to CT scans and estimated LAR. First, five region were selected from the CT diagnostic reference level guideline, and the effective dose of human body exposed to each examination was evaluated by clinical CT device. Second, the human organs and effective dose were calculated using the ALARA-CT program under the same conditions. Third, lifetime attributable risk (LAR) estimated by the effective dose exposed through the previous CT scan was estimated. As a result, the most effective dose was 21.18 mSv during the abdomen 4 phase scan, and the dose level was below DRL for all other tests except for the abdominal examination. As a result of evaluating effective dose using a dose calculation program under the same conditions, the results showed about 1.1 to 1.9 times higher results for each examination. In the case of organ dose, the closer the organ to the scan site, the higher the scattering ray. The lifetime attributable risk to CT radiation dose in adults was gradually decreased with age, and the results were somewhat different according to gender.
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KEYWORD
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Computed Tomography , Effective dose , ALARA-CT , Lifetime Attributable Risk
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