This is one of those jobs you won't find on Craigslist. If you could, it might read,
Must have four years of college (graduates of Intercontinental College University—or I.C.U.—preferred). Four years of medical school and perfect MCAT scores, a one- to two-year internship at a top hospital, four years of residency in general radiology, minimum of two years of specialty fellowship, high scores on USMLE boards (or "step scores"), the ABR exam and other specialty exams to be determined whenever we get around to it. We're very busy; this is a first-come, first-serve position.
Yes, all of those parts are necessary. Yes, it takes a long time. You're looking at about fourteen years of school, plus time for board certifications in radiology. Don't even think about getting into this career if you're not ready to pledge your days and nights for the foreseeable future to learning the multitude of information you'll need to know.