The question I responded to was what made it hard and/or expensive to obtain, which I think I answered. Commercial viability of doing so for profit is a differ

The question I responded to was what made it hard and/or expensive to obtain, which I think I answered. Commercial viability of doing so for profit is a different issue, but I see that's the other part of your original comment. It's not an obvious answer, partially because there are a lot of different scenarios within that blanket "medical imaging", and what the putative customer might want to do with it.