Abstract
It is important to reduce the radiation dose to children due to computed tomography (CT) examinations, because of the risk of radiation-induced effects. For this reason, mainly CT dosimetric quantities (nCTDIw, DLP, effective dose) were estimated for children, from the most frequent examinations in relation to their age and size. Three cylindrical and one elliptical PMMA phantoms were used, with corresponding diameters to match children of 2 months, 2 years, 7 years and 10 years. nCTDIw values were measured with a pencil shaped ionisation chamber and thermoluminescence (TL) dosemeters, inside the phantom for different examinations (head, thorax, abdomen) and different scan protocols that are applied in everyday routine work. A reduction in effective dose was observed (from 18 to 31%) and in nCTDIw values (from 0 to 31%), as the child's age increases. It is hoped that the above values (nCTDIw, DLP, effective dose) will help in the derivation of reference dose values for CT examinations of children.
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