DOSIMETRY OF OCCUPATIONALLY EXPOSED PERSONS IN DIAGNOSTIC AND INTERVENTIONAL ARTERIOGRAPHY. PART II: ASSESSMENT OF EFFECTIVE DOSE

摘要

This study aimed to quantify effective dose (E) for occupationally exposed persons (workers) in diagnostic and interventional arteriography. Using Monte Carlo radiation transport calculations, new air kerma to organ dose conversion coef ficients (DCCs) were determined. Taking attenuation by protective clothing into account, E was estimated from the DCCs and entrance doses measured at forehead, neck, thorax, abdomen, upper arms, hands and lower legs of the workers. Average E was calculated for several types of procedures and for three hospitals. For operators, E was between 0.5 and 7 μSv per procedure for undercouch X ray tubes and between 0.8 and 22 μSv for overcouch tubes. For assistants, E was typically a factor of two lower. Wearing a thyroid collar roughly reduced E by 50. These values are low, which is due, among other things, to the nearly general use of a mechanical contrast injector and an undercouch X ray tube.