Something like this: http://www.nikonmetrology.com/en_EU/Products/X-ray-and-CT-In...

It weighs slightly over a (metric) ton, and despite being marketed as "low cost" model, it's not something the average hobbyist can afford. Or even needs :)

And yes, it's lead-lined, completely enclosed and safe to use as long as you don't put your hamster in it.