MRI scanners use a strong magnetic field, so we need to make sure that you are safe to enter the scanning room, (as an example, some types of implants aren’t suitable for the scanner). Our safety questions only deal with internal, hidden or non-removable implants, so if you have visible items such as an external hearing aid we may ask you to remove it on the day. We always double check the safety questions with you before your scan just to be safe.