A recent issue of the New England Journal of Medicine contained an expert review on the health risks of radiation exposure from computed tomography (CT) (1). The article was authored by David J. Brenner and Eric J. Hall, from the Center for Radiological Research in New York. Brenner, in particular, is a leader in the field of research regarding the health effects of ionizing radiation from environmental, occupational and medical sources. Among his numerous publications are several research papers on radiation exposure associated with CT, as well as two books on radiation and health for the lay person.