Hi...sure u can upload them to a photo album in ur profile page and u can choose to allow the public to see them, if so make sure there is no personal info on the MRI...or u can choose to only allow friends to see it or private for just urself to keep a private journal of sorts...
As u said u can not get a dx here, but we can say if we see something that our Drs have pointed out to us and u can compare ur MRI image to ours as well.....