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Trends in CT Examinations and Diagnostic Reference Level (DRL) 30243728 吉田, みどり ヨシダ, ミドリ Yoshida, Midori 吉田 ヨシダ Yoshida みどり ミドリ Midori 30192321 誉田, 栄一 ホンダ, エイイチ Honda, Eiichi 誉田 ホンダ Honda 栄一 エイイチ Eiichi open access This article is published under the terms of the Creative Commons Attribution (CC-BY) license. It also allows immediate deposit of the final published version in other repositories without restriction on re-use. CT examination DRL CTDI ICRP OECD UNSCEAR Medical exposure is increasing year by year. The main reason is an increase in CT examinations. X-ray examination has been shifting from conventional radiography to CT imaging. Although CT examinations account for only 7.9% of the total number of diagnostic medical examinations, the contribution is about 47% of the total collective effective dose due to diagnostic medical radiology in health-care level I countries according to the 1997-2007 survey by UNSCEAR. Dental X-ray examinations have hardly contributed it, but CT examination is indispensable in dentistry. Dentists also should follow the requirements for CT imaging by the ICRP recommendation and review CT imaging protocol based on national diagnostic reference level (DRL). SciTechnol 2019-01-07 eng journal article VoR 355818 https://tokushima-u.repo.nii.ac.jp/records/2009621 24700886 Dental Health : Current Research 5 1 1000e107 https://tokushima-u.repo.nii.ac.jp/record/2009621/files/denthealcurres_5_1_1000e107.pdf application/pdf 766 KB 2023-01-10