Purpose. The purpose of the paper is to develop and approve the method of the CT main electrical and radiation characteristics evaluation in clinical using conditions. These tests are executed to implement a quality assurance program that ensures the electrical and radiation safety of patients and medical stuff, as well as the medical images acquisition with high diagnostic level.

Materials and methods. For evaluation of the CT main electrical and radiation characteristics by using of  traditional for X-ray diagnostic apparatus methods and X-ray testing devices, it is necessary for X-ray emitter to be fixed. Such a configuration can be provided in the service mode of apparatus operation only but the stuff of the organizations conducting the tests do not have access rights to the service mode as a rule. As an alternative the method of the CT main characteristics evaluation by using the clinical mode for topograms obtaining is being suggested.

Results. The suggested method was successfully approved on the basis of the testing laboratory for radiology equipment concerning the СТ characteristics evaluation. Using this method about 50 CT of various manufacturing companies have been tested for the period from 2014 to 2019 in different Russian regions.

Conclusions. By using of the presented method in clinical conditions the evaluation of the CT main electrical and radiation characteristics can be carried out without additional involvement of specialists performing service and / or repair of the equipment. Testing time is not more than 30-40 minutes. Thus, CT characteristics testing process does not influence on the patients diagnostic examination schedule significantly.