Also known as: Nuclear magnetic resonance - cranial, Magnetic resonance imaging - cranial, MRI of the head, MRI - cranial, NMR - cranial, Cranial MRI, Brain MRI, MRI - brain or MRI - head
- Brain aneurysm clips
- Certain types of artificial heart valves
- Heart defibrillator or pacemaker
- Inner ear (cochlear) implants
- Recently placed artificial joints
- Certain types of vascular stents
- Items such as jewelry, watches, credit cards, and hearing aids can be damaged.
- Pins, hairpins, metal zippers, and similar metallic items can distort the images.
- Removable dental work should be taken out just before the scan.
- Birth defect of the brain
- Bleeding in the brain (subarachnoid or intracranial hemorrhage)
- Brain infection
- Brain tumors
- Hormonal disorders (such as acromegaly, galactorrhea, and Cushing syndrome)
- Multiple sclerosis
- Muscle weakness or numbness and tingling
- Changes in thinking or behavior
- Hearing loss
- Headaches when certain other symptoms or signs are present
- Speaking difficulties
- Vision problems
- Abnormal blood vessels in the brain (arteriovenous malformations of the head)
- Acoustic neuroma
- Bleeding in the brain
- Brain abscess
- Brain aneurysms
- Brain tissue swelling
- Brain tumors
- Damage to the brain from an injury
- Hydrocephalus (fluid collecting around the brain)
- Infection of the bones (osteomyelitis)
- Loss of brain tissue
- Multiple sclerosis
- Optic glioma
- Pituitary tumor
- Stroke or transient ischemic attack (TIA)
- Structural problems in the brain, brain ventricles, and pituitary gland
- Cranial CT scan
- Positron emission tomography (PET) scan of the brain
- Skull x-ray
- Acute trauma of the head and face
- Bleeding in the brain (within the first 24 to 48 hours)
- Early symptoms of stroke
- Skull bone disorders and disorders involving the bones of the ear
A magnetic resonance imaging (MRI) scan of the head is a noninvasive method to create detailed pictures of the brain and surrounding nerve tissues.
Unlike x-rays and computed tomographic (CT) scans, which use radiation, MRI uses powerful magnets and radio waves. Signals from the magnetic field bounce off your body and are sent to a computer, where they are turned into images. Different types of tissues send back different signals.
Single MRI images are called slices. The images can be stored on a computer or printed on film. One exam produces dozens or sometimes hundreds of images.
For more information, see the specific MRI topics:
How the test is performed
You may be asked to wear a hospital gown or clothing without metal fasteners (such as sweatpants and a t-shirt). Certain types of metal can cause inaccurate images.
You will lie on a narrow table, which slides into the middle of the MRI machine. If you fear closed-in spaces (have claustrophobia), tell your doctor before the exam. You may be given a medicine to help you relax, or your doctor may recommend an "open" MRI, in which the machine is not as close to the body.
Small devices, called coils, may be placed around the head. These devices help send and receive the radio waves, and improve the quality of the images.
Some exams require a special dye (contrast). The dye is usually given before the test through a vein (IV) in your hand or forearm. The dye helps the radiologist see certain areas more clearly.
During the MRI, the person who operates the machine will watch you from another room. Several sets of images are usually needed, each taking 2 - 15 minutes. Depending on the areas being studied and type of equipment, the exam may take 1 hour or longer.
How to prepare for the test
Depending on the area being studied, you may be asked not to eat or drink anything for 4 - 6 hours before the scan. Other preparations are usually not needed.
The strong magnetic fields created during an MRI can interfere with certain implants, particularly pacemakers. Persons with cardiac pacemakers cannot have an MRI and should not enter an MRI area.
You may not be able to have an MRI if you have any of the following metallic objects in your body:
Tell your health care provider if you have one of these devices when scheduling the test, so the exact type of metal can be determined.
Before an MRI, sheet metal workers or any person that may have been exposed to small metal fragments should receive a skull x-ray to check for metal in the eyes.
Because the MRI contains a magnet, metal-containing objects such as pens, pocketknives, and eyeglasses may fly across the room. This can be dangerous, so they are not allowed into the scanner area.
Other objects are also not allowed into the room:
How the test will feel
An MRI exam causes no pain. Some people may become anxious inside the scanner. If you have difficulty lying still or are very anxious, you may be given a mild sedative. Excessive movement can blur MRI images and cause errors.
The table may be hard or cold, but you can request a blanket or pillow. The machine produces loud thumping and humming noises when turned on. You can wear ear plugs to help reduce the noise.
An intercom in the room allows you to speak to the person operating the scanner at any time. Some MRIs have televisions and special headphones that you can use to help the time pass.
There is no recovery time, unless you need sedation. After an MRI scan, you can resume your normal diet, activity, and medications.
Why the test is performed
MRI provides detailed pictures of the brain and nerve tissues. It also provides clear pictures of parts of the brain that are difficult to see clearly on CT scans.
A brain MRI can be used to diagnose and monitor many diseases and disorders that affect the brain, including:
An MRI scan of the head can also determine the cause of:
A special type of MRI (called MRA, or magnetic resonance angiography) may be done to look at blood vessels in the brain. For more information see: MRA
What abnormal results mean
The sensitivity of an MRI depends, in part, on the experience of the radiologist.
Abnormal results may be due to:
What the risks are
MRI contains no ionizing radiation. To date, there have been no documented significant side effects of the magnetic fields and radio waves used on the human body.
The most common type of contrast (dye) used is gadolinium. It is very safe. Allergic reactions to the substance rarely occur. The person operating the machine will monitor your heart rate and breathing as needed.
People have been harmed in MRI machines when they did not remove metal objects from their clothes or when metal objects were left in the room by others.
Tests that may be done instead of an MRI of the head include:
A CT scan may be preferred in the following cases, since it is faster and usually available right in the emergency room:
Wilkinson ID, Paley MNJ. Magnetic resonance imaging: basic principles. In: Grainger RC, Allison D, Adam, Dixon AK, eds. Diagnostic Radiology: A Textbook of Medical Imaging. 5th ed. New York, NY: Churchill Livingstone; 2008:chap 5.
Saunders D, Jäger HR, Murray AD, Stevens JM. Skull and brain: methods of examination and anatomy. In: Grainger RC, Allison D, Adam, Dixon AK, eds. Diagnostic Radiology: A Textbook of Medical Imaging. 5th ed. New York, NY: Churchill Livingstone; 2008:chap 55.
- Review date:
- November 21, 2010
- Reviewed by:
- Ken Levin, MD, private practice specializing in Radiology and Nuclear Medicine, Allentown, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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