Magnetic resonance imaging (MRI) is a technique that uses a magnetic field and radio waves to create detailed images of the organs and tissues within your body.
Most MRI machines are large, tube-shaped magnets. When you lie inside an MRI machine, the magnetic field temporarily realigns hydrogen atoms in your body. Radio waves cause these aligned atoms to produce very faint signals, which are used to create cross-sectional MRI images like slices in a loaf of bread.
The MRI machine can also be used to produce 3-D images that may be viewed from many different angles.
Why it's done
MRI is a noninvasive way for your doctor to examine your organs, tissues and skeletal system. It produces high-resolution images that help diagnose a variety of problems.
MRI of the brain and spinal cord
MRI is the most frequently used imaging test of the brain and spinal cord. It's often performed to help diagnose:
- Disorders of the eye and inner ear
- Multiple sclerosis
- Spinal cord injuries
MRI of the blood vessels
An MRI that focuses on the blood vessels can assess:
- Structural problems in the aorta, such as aneurysms or dissections
- Inflammation or blockages in the blood vessels
MRI of other internal organs
An MRI may be used to check for tumors or other abnormalities of many organs in the body, including the:
MRI of bones and joints
MRI may be used to help evaluate:
- Joint disorders, such as arthritis
- Joint abnormalities caused by traumatic or repetitive injuries
- Disk abnormalities in the spine
- Bone infections
- Tumors of the bones and soft tissues
The presence of metal in your body may be a safety hazard or affect a portion of the MRI image. Before receiving an MRI, tell the technologist if you have any metal or electronic devices in your body, such as:
- Metallic joint prostheses
- Artificial heart valves
- An implantable heart defibrillator
- A pacemaker
- Metal clips
- Cochlear implants
- A bullet, shrapnel or any other type of metal fragment
Before you schedule an MRI, tell your doctor if you think you're pregnant. The effects of magnetic fields on fetuses aren't well understood. Your doctor may recommend choosing an alternative exam or postponing the MRI.
It's also important to discuss any kidney or liver problems with your doctor and the technologist, because problems with these organs may limit the use of injected contrast agents during your scan.
How you prepare
Before an MRI exam, eat normally and continue to take your usual medications, unless otherwise instructed. Twin Cities Hospital’s MRI Unit is short bore (6’ deep), so most patients will only partially be in the machine, depending on the area being imaged. The patient will hear intermittent thumping noises and, before the scan begins, will be provided ear plugs to protect their hearing.
Patients should dress in comfortable clothing with no metal zippers, snaps, buttons, or hooks. You will be asked to change into a gown and to remove all watches, jewelry (including ear and body piercings), hairpins, glasses, wigs, dentures, hearing aids and underwire bras. Dressing and locker rooms are available if needed.
What you can expect
During the test
The MRI machine looks like a tube that has both ends open. You lie down on a movable table that slides into the opening of the tube. A technologist monitors you from another room. You can talk with the person by microphone.
The MRI machine creates a strong magnetic field around you, and radio waves are directed at your body. The procedure is painless. You don't feel the magnetic field or radio waves, and there are no moving parts around you.
During the MRI scan, the internal part of the magnet produces repetitive tapping, thumping and other noises. Earplugs may be provided to help block the noise. If you are worried about feeling claustrophobic inside the MRI machine, talk to your doctor beforehand. You may receive a sedative before the scan from your physician if he/she feels you would need it.
In some cases, a contrast material, typically gadolinium, may be injected through an intravenous (IV) line into a vein in your hand or arm. The contrast material enhances the appearance of certain details. The material used for MRIs is less likely to cause an allergic reaction than the material used for CT scans.
An MRI can last up to 30 min to an hour or more. You must hold very still because movement can blur the resulting images.
After the test
If you haven't been sedated, you may resume your usual activities immediately after the scan.
A doctor specially trained to interpret MRIs (radiologist) will analyze the images from your scan and report the findings to your doctor. Your doctor will discuss any important findings and next steps with you.