

It does, maybe it’s just not precise enough for you, but it does. Medical imaging for humans. What do you actually want?
I don’t believe you’re here to argue in good faith anyway.
Edit: I also notice that you carefully avoided another answer that goes into much more details than mine. Yeah you’re not here in good faith.
So in general, research on animals is a step before research on humans. That’s as simple as that. It costs more to do experimentation on humans, and it’s also more dangerous (to humans). But you didn’t need the article for that, any simple research online would have given you that answer.
I maintain that you are not arguing in good faith here.