What happens at an MRI?
Last updated September 3, 2026.
You lie still on a table that slides into a tunnel-shaped scanner while powerful magnets and radio waves - no x-rays - build the images over roughly 30 to 60 loud minutes. Earplugs and an intercom are standard; some scans add IV contrast dye. Your only real job is staying still, since movement blurs the pictures.
What to do
- Declare all metal and implants. Pacemakers, clips, fragments, and some implants change whether or how the scan happens.
- Dress metal-free. Sweatpants and a t-shirt beat changing - zippers and snaps can blur images.
- Flag claustrophobia early. Calming medication or an open MRI are options when named before the day.
- Use the earplugs. The thumping is normal machine noise, not malfunction.
Related questions
- Is an MRI safe?
- Can I get an MRI with a tattoo?
- What if I am claustrophobic during an MRI?
- Do CT scans cause cancer?
