RespirAct [Getty Images]

TORONTO, ON - JULY 29: Toronto Star reporter Joe Hall's brain scan images taken during his visit to the Toronto Western Hospital's MRI room on July 29, 2015. A machine called RespirAct allows the control and monitoring of carbon dioxide levels during a patient's MRI scan.

Brian B. Bettencourt / Toronto Star Brian B. Bettencourt/Toronto Star (Brian B. Bettencourt/Toronto Star via Getty Images)

Toronto Star Brian B. Bettencourt