I found a NY Times article, which starts out:

A man who entered an M.R.I. room during a scan in Westbury, N.Y., on Wednesday was pulled into the machine by his chain necklace and was hospitalized in critical condition, the authorities said.

The man, who is 61, was wearing a “large metallic chain” around his neck when he entered the room at Nassau Open MRI around 4:34 p.m., according to the Nassau County Police Department, on Long Island. The man, whom the police did not name, did not have authorization to enter the room, the authorities said.