An X-ray machine is basically a film camera.
The processing of the films takes about 10 minutes, and the rig can be reset to focus specifically within it's range of possible depth of field.

We took numerous films of my equipment today, the known flaws in the Tower pistol and the little .410 sxs showed up nicely. The pistol has damaged springs and some Great Salt Lake sized pits in the chamber area, the little double has issues in the chambers.

Cracks and pits are pretty obvious in the images.
So is solder or brazing material in between the ribs or shims from regulation.
Wall thickness can be seen clearly and so can the shape and fitness of the chambers.
I could clearly see all the joints of the dovetailed (circa 1860) lumps of the Mahillon barrels. I'm really looking forward to running that thing now. The barrels look marvelous. The finish and pattern on the two sets of barrels for that gun are just amazing.

On the Tolley barrels I could clearly see the set screw for the rear sight and all it's detail, the platnium wedge, the outlines of the barrel flats and the lumps, extractor, forend loop...
They look good and I'm excited to run some powder and bullets through them.

Real time viewing so to speak isn't available with the x-ray process.
Burn the film and inspect it. The fames come out 1to1 ratio, full life size.
I didn't bother looking into the machine and I wouldn't be concerned about what model x-ray ends up getting used, it's more up to the operator and thier knowlege of the tooling combined with knowing what to look for once the films are made.

I'd say just look in the yellow pages for metallurgy or engineering in your local area and go from there.
The folks I worked with would happily take barrels from anyone and run them, the parts leaving the X-ray machine were ejector seat blowoff gas manifolds, zero tolerance for problems with that kind of stuff.

It's off to the workshop to fireform another batch of brass...

--Tinker