Parameter factors influence on patient dose and image quality in paediatric CT
The su ccessful use of CT for children is a challenging task. Children differ anatomically and physiologically from adults, so there are different requirements for image quality. There are also different requirements on the selection of the right combination of CT equipment and exposure parameters (kV, mA, slice thickness and pitch) that are adapted for the specific child anatomy and physiology. There are big differences in the size of the body between the children, so the dose is strongly influenced by the chosen physical and technical parameters during a CT examination. There are no universal exposure parameters that are applicable to all types of CT due to the differences in the design and the technical characteristics of the different CT systems. The first step in the optimization process should be a survey of the technical specification of the system, the algorithm for selection of the exposure parameters and their influence on patient dose. The purpose of this work is to summarize the most important parameters of the optimization process, such as: topogram and length of the scanned area; scanning mode; tube current (mA and mAs); automatic tube current modulation; tube output; pitch; slice thickness and beam width; patient immobilization; sedation and patient shielding.
Key words: PAEDIATRIC CT. OPTIMIzATION. RADIATION EXPOSURE. RADIATION PROTECTION