ORLANDO, Fla.Perspective is critical in the radiation exposure discussion. Aaron D. Sodickson, MD, PhD, of Brigham & Womens Hospital in Boston, shared the bucket analogy during a June 9 session at the annual meeting of the Society for Imaging Informatics in Medicine (SIIM). [Cancer] risk from radiation exposure is a drop in the bucket. But we need to know how full the bucket is, how quickly we are adding to it and the size of drops.