Advanced radiologic imaging, such as the CT scan, has revolutionized medical practice in a quite fundamental and extremely beneficial manner. CT scanning contributes to more effective surgeries, elimination of many exploratory surgeries, earlier and better treatment of cancer, more efficient treatment of trauma, and better management of stroke and cardiac disease. But, like almost all medical practices, radiologic imaging has both benefits and risks, and the challenge is to provide the patient with the best possible benefit/risk balance.1