[1] Northwestern Univ, Med Ctr, Dept Radiol, Chicago, IL 60611 USA
[2] Univ Maryland, Sch Med, Dept Diagnost Imaging, Baltimore, MD 21201 USA
[3] Radiol Soc N Amer, Dept Informat, Oak Brook, IL USA
[4] Healthcare Informat & Management Sys Soc, Dept Profess Serv, Chicago, IL USA