With healthcare professionals thinking about the effects of ionizing radiation on the population at large, there is particular concern about its use for imaging children. That there is reason for concern was underscored by the release of new study results earlier this year, which indicated computed tomography (CT) exams of children in hospital emergency departments increased substantially from 1995 to 2008. While CT still may be the best imaging choice in certain cases, there is continued emphasis on using other modalities whenever possible. As a result, magnetic resonance imaging (MRI) is being used more and more,