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Image Gently: why we should talk to parents about CT in children.

AJR:192, May 2009 The utilization of CT continues to increase in the United States and the world [3, 12]. Since its introduction in the early 1970s, CT use has risen from 2 million studies per year to more than 65 million annually. Each new CT unit purchased from 1995 to 2004 averaged more than 2,200 new studies per year [9]. There are now more than 10,000 CT units estimated to be in operation. Approximately 7 million CT scans were obtained in children in 2007. Although CT examinations make up 11% of the number of radiologic procedures, radiation from CT delivers as much as 70% of the diagnostic imaging–related radiation dose [12]. Broder et al. [13] have indicated dramatic changes in CT use in children. In their pediatric emergency department, visit volume from 2000 to 2006 remained stable, but chest CT increased 435% and cervical spine CT, 366%.