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-raysand computed tomographic (CT) scans, which use radiation, MRI uses powerful magnets and radio waves. The MRI scanner contains the magnet. The magnetic field produced by an MRI is about 10 thousand times greater than the earth's.
The magnetic field forces hydrogen atoms in the body to line up in a certain way (similar to how the needle on a compass moves when you hold it near a magnet). When radio waves are sent toward the lined-up hydrogen atoms, they bounce back, and a computer records the signal. 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.
See: MRI
Alternative NamesNuclear magnetic resonance - cranial; Magnetic resonance imaging - cranial; MRI of the head; MRI - cranial; NMR - cranial; Cranial MRI; Brain MRI; MRI - brain; MRI - head
How the test is performedYou 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 confined spaces (have claustrophobia), tell your doctor before the exam. You may be given a medicine to help you feel sleep and less anxious, or your doctor may recommend an "open" MRI, in which the machine is not as close to the body.
Small devices, called coils, are 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 testDepending 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 metallic objects are also not allowed into the room:
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 performedMRI 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.
MRI can also show:
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 help:
MRI is sometimes used to avoid the dangers of angiography or of repeated exposure to radiation.
What abnormal results meanThe sensitivity of an MRI depends, in part, on the experience of the radiologist.
Abnormal results may be due to:
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.
MRI is usually not recommended for acute trauma situations, because tractionand life-support equipment cannot safely enter the scanner area and the exam can take quite a bit of time.
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.
Special considerationsTests 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, Jager 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.
Yes, having a sewing needle embedded in the foot could be dangerous if you were to have an MRI. The magnetic field of the MRI machine could cause the needle to move or potentially injure the surrounding tissue. It is important to inform your healthcare provider or the MRI technologist if you have a foreign object in your body before undergoing an MRI.
No, an MRI does not emit radiation during the imaging process.
MRI systems are significantly stronger than refrigerator magnets, with MRI systems typically having magnetic fields thousands of times stronger than refrigerator magnets.
MRI uses radiofrequency electromagnetic waves to create detailed images of the body's internal structures.
MRI - Magnetic Resonance Imaging
If the MRI technologist positions you with your leg going into the magnet (the MRI machine) then your head would be out of it. Call the facility where you are scheduled to have the MRI and ask to speak with the MRI technologist and they can fully explain to you exactly how you will be positioned.
No u can't. An MRI is done by a giant magnet.
an MRI is just a scan
I am having sever pain in my neck and the back of my head. I am having an MRI of my neck and wanted to now what that would show.
A final MRI is done with the frame in place to help set the coordinates of the GPi in relation to the frame.
Mri of the body... Or a cat scan of the head
Yes, only metal objects cannot go into an MRI. My father invented the Ommaya reservior, he recently passed away. Alex
Can anyone help answer this ? im wanting to go to school for MRI but wanna make sure the fact that I have metal plates in my face and head will not cause an issue.
an MRI
an MRI
No. You have your head barely out, so you should be OK even if you are claustrophobic.
Many things are ruled out, Bleeding around the brain, aneurisms, tumors, clots.