Magnetic resonance imaging, or MRI, machines allow medical professionals to see inside the body, particularly soft tissues that don't contain bone and therefore don't show up well on X-rays.
MRIs don't use radiation like X-rays either. An MRI scan applies a strong magnetic field to the body and uses a computer to see how the water molecules in the body react to the magnetic field to create images.
Before Your MRI
If your doctor orders an MRI outside of an emergency situation, you'll likely need to set a separate appointment at a facility with an MRI scanner. The facility should tell you how long the appointment should take. Most MRI scans can take around an hour.
Ask your doctor about medication for anxiety for your MRI appointment if you have severe claustrophobia, as you'll need to lie still in the machine for the duration of the scan.
When you arrive you'll fill out forms about your medical history and safety questions. Most MRI facilities request patients arrive early to check in and fill out paperwork.
You'll be given a hospital gown to change into, and you'll need to remove all of your clothes and jewelry, including any metal piercings. It's very important to tell the radiology staff about any medical conditions you have and any surgeries you've had.
Some people who have implanted medical devices, such as insulin pumps, spinal stimulators, and pacemakers, or metal implants cannot go into MRI machines due to the strong magnets in the machine.
During the Scan
You'll lie down on a hard surface that slides in and out of the MRI scanner so the technician can position your body where needed.
The MRI technician will be in an adjacent room that is closed off from the room the machine is in, but you'll be able to communicate with the technician via a two-way intercom.
Many MRI facilities give patients headphones to listen to music during the imaging test. MRI machines make loud banging noises when in operation.
You'll need to hold very still in the machine so the technician can get clear images, and the technician might ask you to hold your breath periodically for up to 30 seconds, depending on what part of your body is being scanned.
After the MRI
Most people are able to leave immediately after an MRI and drive home safely. If you received any kind of intravenous dye injection during your scan, the IV will be removed and the MRI technician will monitor you for any kind of allergic reaction before you leave.
If you received sedation medication, you'll need to wait until you're awake and alert to leave. The MRI facility will require you to have a driver with you if you received sedation.
Talk to the MRI technician about any questions or concerns you have prior to your procedure, especially if you need any accommodations made.
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