Using susceptibility-weighted imaging (SWI), researchers have identified microstructural changes in the brains of male and female college-level ice hockey players that could be due to concussive or subconcussive trauma. This is the first time SWI has been used to detect signs of concussion (or mild traumatic brain injury), and the first time it has been used to detect changes in the brain prospectively over an entire sports season in athletes of both sexes.