From what I saw on the interiew trail, DO radiology residencies are at community hospitals so its much more about getting the work done and I think there are less didactics. Most of the teaching was at the viewbox and everything else was resident driven. Some of the equipment at DO hospitals isn't as advanced as the stuff you'll find at academic university MD radiology residencies. From what I saw, at the DO programs you don't really have a set month on Chest, etc....you just kind of do it all each day. Some argue that's great to get you ready for private practice. Others argue that its better to learn as much as you can over a month and that repitition helps you retain it.....I guess its just perspective and choice that you want out of your residency training.
I think it would be easier to go into academic radiology if you were trained at an academic program, and most of those are MD residencies.