2. For safety reasons, MRI is not recommended in this case. If necessary, a simple breathing balloon can be used, but we should not blindly lengthen the breathing tube and give up the suggestion of extending the tube. Because: after tracheotomy, the pipeline becomes a part of the patient's airway, and the gas inside does not participate in gas exchange, which is called "dead space". If the pipe is too long, the following will happen: when the patient exhales, the exhaled air enters and stays in the pipe, and when the patient inhales next time, the exhaust gas in the pipe is sucked back. As a result, patients always breathe the exhaust gas in the pipeline instead of fresh oxygen, which may eventually lead to suffocation.