There is almost always some way to do more work and get more accuracy (e.g. getting MRIs from 2 different places, having 2 groups analyze them, etc), but we don

There is almost always some way to do more work and get more accuracy (e.g. getting MRIs from 2 different places, having 2 groups analyze them, etc), but we don't generally do all these things because there are costs involved. Conversely reducing costs is often valuable, even if accuracy degrades a bit, depending on how steep the trade off is