Examination frequencies and patient doses from computed tomography examinations in the area of Athens, Greece

A survey was conducted in the Athens region between the years 1996-1997, in which 33 CT scanner facilities from the 67 operating in this area participated. Examination frequencies from the 33 scanners were 187,875 per year for all types of examinations. Using published estimations for the mean effective dose for each type of examination, it was estimated that the collective dose from the above examinations was about 1,100 person-Sv, which, if projected to the total number of 152 CT scanners operating in Greece at the time of the survey, results in about 0.5 mSv per caput dose each year for the Greek population, which is probably the highest in Europe.