To put it in perspective, the real worry about MRIs is that people would want to do biopsies or a PET scan if they find something that looks like cancer. That'

To put it in perspective, the real worry about MRIs is that people would want to do biopsies or a PET scan if they find something that looks like cancer. That's really the main concern. And we can fix that by doing a follow-up scan several months later to look for any changes. It also has a nice side-effect of reassuring hypochondriacs that they _don't_ have cancer.