Please refer this page written on the UCSF website, we couldn't have said it better:
http://www.radiology.ucsf.edu/residents/IMGs.shtml
As per the UCSF website (not the views of radRounds)
"We welcome your interest in our program. We seek the most qualified residents, regardless of country of education. Some of our most outstanding residents and faculty are international medical graduates (IMGs), as is our former chairman, Alexander Margulis, MD.
Please note that because of the large number of applications and the difficulty of evaluating the records of IMGs, we can offer interviews only to those IMGs who have all of the following qualifications: a strong record of research (usually in a department of radiology in the United States) with multiple first-authored publications in peer-reviewed journals; outstanding letters of recommendation, including at least one written by someone who is known to our selection committee; and high scores on both Steps 1 and 2 of the United States Medical Licensing Examination (USMLE) -- at least 240 on the three-digit scale (usually corresponding to 99 on the two-digit scale). Please bear in mind that we cannot consider IMGs who do not meet all of these criteria and that high USMLE scores are not sufficient for an interview.
Applications from IMGs are not considered to be complete until we receive evidence of ECFMG certification and a copy of the Application Status Letter from the Medical Board of California. IMGs may contact the ECFMG for information on ERAS and application procedures.
The UCSF Graduate Medical Education website has additional information.
If you will need a visa, you must obtain an ECFMG-sponsored J-1 visa. Please note that H-1b visas are not available to our trainees who are graduates of international medical schools.
We wish you the best."