i work in a radiology center and the starting pay for a rad tech is around 16-18 dollars and hour fresh out of school. i talked to our mri tech and she says it will usually depend on experience and also demand in the field in the area you are in. of coarse, she's been doing it for about 15 years so she makes considerably more and she is our lead tech. she said it comes and goes on whether there is a demand for that job. of coarse, it will also depend on what machines etc you can run. we also have some techs who have second jobs on a "on call" basis for hospitals and they make pretty good money that way.
as far as a radiologist, reading films, ours make pretty good money, they get paid on what we collect, but we are a private center.