CT scanning technology is a valuable tool to diagnose many diseases; however, the levelof the radiation dose is a source of concern, especially for children. CT scan systems anddose measurement methods have evolved over the years; but reported pediatric effectivedoses (EDs) have sometimes exceeded the annual dose limit recommended by the ICRP (1 mSvper year for persons under 18 years) (ICRP, 2007a).Efforts have been made to reduce organ doses and EDs by adjusting the scan parameters.This paper describes the determinants of the ED, and the dose reduction techniques inpediatric imaging from the early age of CT examinations until now. The firstepidemiological results regarding the associated risk of cancer are also brieflypresented.
