Excessive imaging of patients increases health care costs and the risk for cancer. It also may create needless delays in disposition decisions. The idea: when a physician opens an order for a CT scan, prior CT's done in the last 3 years would be listed, allowing the physician to consider alternative means of testing or deciding not to image at this point at all. Additionally, the approximate amount of radiation and its risk for that study would be displayed. (Currently radiation information appears on the reading, but not in the order).