



For example, one study that looked retrospectively at all head CTs ordered for trauma concluded that more than 1/3 were unnecessary based on the Canadian CT head rule. However, likely because it is such a valuable tool, there seems to be little doubt that we overuse it. It allows for incredibly rapid identification of a myriad of life-threatening conditions. Background: The CT scan is arguably one of the most important pieces of diagnostic technology that we use in emergency medicine.
