Sorry, I hope I did not confuse you. A linac (lots of cool physics in there) just makes the Xrays, the IMRT part controls the intensity and area resulting in a selected volume.
My guess is that they both use IMRT or similar. I ended up getting IMRT in a small place in GA. They did have a brand new IMRT (and knew where what they are doing).
I did not have mets and still had chemo, on the other had you need a big enough number of (active) cancer cells to show up in a PET, so if you SEE mets you know what needs to be done.
To chemo or not to chemo depends on how local the cancer is how paranoid you and your RO/MO are and last but not least how well you can handle chemo.


M