Mary Alice Statkiewicz Sherer, AS, RT(R), FASRT, Radiography Instructor, High-Tech Institute, Nashville, TN, Paula J. Visconti, PhD, DABR, Director of Medical Physics, Radiation Safety Officer, Memorial Hospital of Burlington County, Mount Holly, NJ and E. Russell Ritenour, PhD, DABR, FAAPM, FACR, Professor and Director of Physics Section, Department of Radiology, University of Minnesota School of Medicine, Minneapolis, MN