I recall these cards being mention in an old thread. They were described as part of a custom medical imaging system. I don't recall that any one definitely identified them, knows about their exact use or the software that was used to run them though.
I knew and optical surgeon in our local Amiga club back in the early 1990's who told me they used imaging systems and Amigas as part of their practice. Perhaps this was the use? Only a guess though.
Plaz