It is very hi tech. Actually it's called the "Cyberknife"

It's ironic that it's the first place I've ever worked where I hope people never have to encounter it, except as a technological item, because if they do it means they've got the big "C". But it works on almost all cases if caught in time. The company is named Accuray. Check it out if you have a few spare moments. It's very interesting stuff.

-fleetfoot