I don't know all the medical stuff, but I know imaging tech is like any other electronics based tech... continually improved/refreshed. I've heard that the software that helps detect anomalies has improved by leaps and bounds (mostly articles I've seen about cancer detection). Also I would think that team doctors are more inclined to request blood tests and imaging than in the past simply because of the availability of these tools and knowing what severe bruising can do. I would bet that 10 or more years ago, this testing was used primarily if a player is showing symptoms but now it's used more routinely. If you look more, you're likely to find more. Which is great news; you don't want an issue to fester and get worse if you can treat it early. (Didn't clotting hasten... Mair's retirement? Or was is Kaleta? Or...?)