In this Perspective linked to Rodriguez and colleagues, Emmanuel Lagarde discusses the importance of decision instruments that can help physicians avoid subjecting patients to radiation exposure from unnecessary CT scans.

Development of Distributed Generic Simulator (GenSim) through Invention of Simulated Network (simNetwork) Cheol-Hea Koo, Hoon-Hee Lee, and Yee-Jin Cheon Satellite Flight Software Department, Satellite Technology Division, Korea Aerospace Research Institute, Daejeon 305-333, Korea Satellite Control System Department, Satellite Technology Division, Korea Aerospace Research Institute, Daejeon 305-...