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A Review of Diagnostic Reference Levels in Computed Tomography


Jemal Edris Dawd , Dilber Uzun Ozsahin and Ilker Ozsahin*  


Computed tomography (CT) scanning generate 3-D images of the inside structures of the body by delivering comparatively radiation dose to the patient. This requires high concern of optimization via establishing diagnostic reference level (DRL). DRL values can be estimated based on reference patient percentiles (such as 90th, 75th and 50th) dose distribution. DRL has significant uses in professional judgments by generating harmonized evidence about the radiation dose received by the patient. The primary goal of this review is to assess the practical application of DRL in CT procedures internationally. The main objective of establishing DRLs is to optimize the patient dose and without compromising the image quality in order to obtain adequate diagnostic information. That means inescapability of DRL for a country in medical diagnosis is to reduce the limitation of dose dispersion, to harmonize and expand good practice, to narrow large dispersion of doses, and to create systematic supervision for unwanted radiological doses. The review presents that international records have a wide-range of mean dose distributions due to the variation of exam protocols and technical parameters in use. Hence, this review recommends that each CT health facilities are required exercising careful dose reduction strategies by accounting adequate image quality with sufficient diagnostic information via through follow up of concerned bodies.


radiation, CT, patient, dose, DRL, optimization, protection


Radiation Research and Documentation Department, Ethiopian Radiation Protection Authority, Addis Ababa, Akaki Kality, Department of Biomedical Engineering, Near East University, Nicosia/TRNC, Mersin-10, Department of Biomedical Engineering, Near East University, Nicosia/TRNC, Mersin-10

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