I suspect that this is not a question of hospitals not updating but of minimizing the risks of importing electronic files into a medical computer for fear of a computer virus. So a digital image on would only be of use to a patient as no sensible doctor/hospital would choose to load a third party file into their computer regardless of any virus scanning.
Technically it is possible to take a photographic image in either positive or negative form and scan it to produce a hi-resolution digital image file such as a jpeg. However, I have no idea where you would find a photographic lab to perform this task these days.