A New York hospital has paid $2.9 million to settle the medical malpractice case of a 6-year-old boy who was killed after he was struck in the head by an oxygen tank during an MRI. The boy was lying in an MRI chamber when the machine’s magnet pulled in a metal tank that a hospital staffer had brought into the MRI’s magnetic field. This is one of a number of recent cases in which people have been severely injured or killed by metal objects that were left in an MRI room.