This article from Health Affairs, explores the two models of teleradiology that currently exist - the Nighthawk (US trained, board-certified radiologists) vs the "Indian" model (non board-certified, lowly paid).
Obviously the majority of the article is devoted to the legal minefields associated with the Indian model, especially since the erring Indian radiologists cannot be brought to book. Having said this, I know for sure that there are very examples of the Indian model - most of this is hype related to the old Saini Saini controversy.
The Nighthawk model is followed by Arjun Kalyanpur of Teleradiology Solutions. The Indian model...show me even one company that you can find.