I am also heavily involved in interviewing and in the ranking process, including insider faculty discussions of candidates.
USMLE scores continue to play a critical role in the admissions process to radiology residency, even during and after the interview.
Prior to the interview, we are given a folder with the candidate's scores in clear view. Not only does this influence the perception of the candidate during the interview, the scores play a central role in ranking candidates afterward. While it is possible to have a below average score and be ranked toward the top, the odds are heavily stacked against you.
Most faculty comments about a particular candidate include specific mention of their scores and often, their medical school reputation and overall medical school performance. Some faculty will even dig into a candidate's Dean's letter and mention specific excerpts from it during the round-table discussion.
While it is possible to shine during an interview, it is more likely for the interview to have a neutral or negative effect on a candidate's application.