MRIs use magnetic waves to create detailed images of organs and tissue. They can be used to diagnose stroke and blood vessel issues, spinal cord problems, tumors, multiple sclerosis (MS), aneurysms, joint injuries, and more. What to expect: You’ll be asked to remove all your clothes and put on a hospital gown. Then, you’ll lie on a table that slides into a tunnel-like MRI machine, which may make loud noises as the magnets work. An MRI usually takes 45 minutes to an hour. Tips and tricks: Talk to your HCP about options for helping you relax during your MRI, such as soothing music or a sleep mask. Some tests require you to be confined in a small space. Talk to your HCP about your options if you have any concerns about claustrophobia.You cannot have any metal in the room with you, since an MRI is a giant magnet. Be sure to alert the technician if you have any metal in your body.