A couple of things...
1) a radiology fellowship (ie, in Interventional) wouldn't be completed until after the completion of a 5 year Diagnostic Radiology residency
2) rankings of residencies and fellowships are generally not centralized (ie, there's no US News and World Report issue about it) and are generally deemed to be highly subjective. After all, unless you are concerned with academic medicine, most people choose their residency based on where they want to live and where they match rather than some ranking system.
Anyway, I'll move this to the Radiology Forum for you.