The user is important. In a related vein, back in the 1990 time frame when I was in a lab trying to remove film from the radiology business, among the deal breaking, must have or it can not be used, was that we had to use a foot switch to move from one set of four "films" to the next. Nothing else was acceptable.<p>I've been away from that field for 20 years, I wonder if radiologists have learned to use something other than a foot to advance the films in the reading room.<p>EOM<p>The following line intersects the article at precisely one point…<p>Radiologists are bizarre creatures who have rebuilt their brains into sophisticated, hard wired image processing and analysis systems. You do not screw with their mojo.<p>If you are ever compelled to be a radiologist you need to do this:<p>1) Look at the pictures.<p>2) Say aloud "Normal chest".<p>3) Put a $100 in your pocket.<p>4) Tap the foot switch.<p>5) Repeat.<p>You'll probably be right for 90% of cases too! Though, the 10% that die a premature painful death might not appreciate that fact.