Very cool! We (Paperspace) just posted a tutorial on Detecting Pneumonia from X-ray scans using PyTorch for anyone interested in building some more intuitions around this type of Deep Learning: https://blog.paperspace.com/detecting-and-localizing-pneumon...
Yes, there is a whole glut of companies in this space working in close collaboration with various hospitals. I've looked at several of these and the general quality of the products is high.