I see, thanks.
What about Radiology CME courses? There are plenty of them in the states. The average length of these course is around 2-3 days and they cost around 500$.
Here's a link:
http://www.radlist.com/
Radiology currently is one of the highest compensated specialties in medicine, so the competition for a radiology spot is understandably VERY competitive.
To answer your question-- No the only thing helpful are strong USMLE scores, step 1 is the most important. The other thing that is vital for a match, especialy for an IMG, are STRONG letters of recommendation from American academic faculty. Published radiology research is very helpful, but is not necessary. Though america prides itself on being a meritocracy, nepotism, though frowned upon, still exists in isolated pockets. If you have a close familty friend or relative that is highly influential at an american residency, that might help.
Thats all. You can't pay your way into radiology. Unless you donate 10 million to a radiology department to endow a chair, but even that would sound sketchy. And even if you are willing to work for 'free' most programs would not take such a candidate.
The other option, if you have already done a residency in your home country is to arrange to do 4 years of fellowship at 1 institution, in an underserved area, which would qualify you to sit for the ABR. However most institutions will simply use you as cheap labor. And when you get your ABR certificate, your job prospects are likely limited to that institution. The exception would be if you were already a renown academic radiologist in another country with similar board certification (FRCR - a fellow of the royal college of radiologists from the UK, for example).