[eklitzke]

I think it's more likely the case that (a) most radiographers aren't trained in medical school to look for distinguishing racial features (why would they be?) and (b) in most cases the radiologist knows or can easily guess the race of the patient anyway so there's no need to try to guess it from X-ray imaging data. There are a lot of anatomical features related to race that have been known since before radiology has been a field, it's just not pertinent to the job of most radiologists.