1 Patient doses and examination frequency for diagnostic radiology in

Abstract: Presented are data on the frequency of x-ray examinations that have been gathered in two surveys with a five year interval. There is a 17 % increase in the number of x-ray examinations from 1993 to 1998. During the same time computed tomography examinations have nearly doubled. Patient dose data for the different types of examinations are also presented and an assessment is made of the contribution of these examinations to the Collective Effective Dose (CED). The number of CT examinations has increased from 8,3 % of all x-ray examinations in 1993 to 13,6 % in 1998 and contributes more the 50 % of the CED in 1998