| Summary: | Were carried out the selective investigation of the adult patients exposure levels during radiological diagnostic procedures with the use of 17 CT scanners in 15 medical organizations of Saint-Petersburg and Leningrad region in 2009–2012. We collected the data on technical parameters of the X-ray computed tomography examinations affecting the level of patient exposure. The effective doses were calculated for scanning of different areas of the patient's body (skull, thorax, abdomen and pelvis). Their mean values were in the range from 0,2 mSv to 31 mSv per examination. The highest doses were observed during the investigation of the abdomen and pelvis. Preliminary values of diagnostic reference levels are proposed for medical organizations of Saint-Petersburg andLeningrad region on the basis of investigation results. These values are defined as the 75% quantile in the distribution of dose length product values. Diagnostic reference levels values obtained in the investigation are comparable with the corresponding values currently accepted in the foreign medical practice.
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