MEG sees a window of brain activity (tangential fields) with more sensitivity and clarity than EEG. Electromagnetic fields are generated by the net effect of this slow ionic current flow. The computer workstation that helps detect and record the signals from the MEG helmet is located in a separate room.Brain cells interact by generating tiny electrical voltages that create electrical currents throughout the brain.

Because they can interfere with the detection of magnetic fields, metal and electronic items are not allowed in the shielded exam room. The SQUID sensors are bathed in a large liquid helium cooling unit at approximately -269 degrees C. Due to low impedance at this temperature, the SQUID device can detect and amplify magnetic fields generated by neurons a few centimeters away from the sensors. Risks. MEG has advantages over both fMRI and EEG. You may be asked to wear a gown or allowed to wear your own clothing, provided it is loose-fitting and has no metal fasteners. Advantages of MEG for surgical planning. A helmet-shaped container is placed on the patient's head. MEG signals are able to show absolute neuronal activity whereas the fMRI signals show relative neuronal activity, meaning that the fMRI signal analysis always be compared to reference neuronal activity. MEG improves the surgical outcomes of epilepsy patients.

A magnetically shielded room houses the equipment, and mitigates interference.

While the magnitude of fields associated with an individual neuron is negligible, the effect of multiple neurons (for example, 50,000 – 100,000) excited together in a specific area generates a measureable magnetic field outside the head. This sophisticated instrument and computer software work together to detect and record the activity of neurons as the patient lies still or completes a series of tasks, such as listening to a series of words or looking at pictures. Patients undergoing MEG do not typically experience claustrophobia. EEG sees a more complete picture of brain activity (tangential and radial), but less clearly than MEG. fMRI signals reflect brain activity indirectly, by measuring the oxygenation of blood flowing near active neurons. The distribution of these magnetic fields is superimposed with an anatomical image of the brain to help identify the source of activity in the brain.An MEG study is a direct measure of brain function and the most advanced method of recording and evaluating the brain while it is actively functioning.MEG creates a roadmap of the brain that is useful for preoperative and treatment planning for individuals with epilepsy and for patients undergoing surgery to remove a brain tumor or other lesion. Noninvasive.

The teddy bear denotes child-specific content.Copyright © 2020 Radiological Society of North America, Inc. (RSNA). You may resume your usual activities and normal diet immediately after the exam.

Safe: MEG does not expose you or your child to radiation. MEG provides also more accurate spatial localization of neural activities than EEG, a complementary method of recording brain activity. At all times during your exam, the technologist will be able to see, hear and speak with you using a two-way intercom. MEG is currently developing use in a number of diverse clinical populations, as one of its primary advantages over other techniques is its superior temporal resolution. You will be given special instructions for how to prepare your child for the sedation or anesthesia.Jewelry and other accessories should be left at home or removed prior to the MEG exam. Sensitive and accurate: MEG allows us to detect the tiny magnetic fields generated by brain activity and show where in the brain that occurs. Leave jewelry at home and wear loose, comfortable clothing. Magnetoencephalography (MEG) is a non-invasive medical test that measures the magnetic fields produced by your brain's electrical currents.

MEG has the advantages of very high temporal and spatial resolution, however it requires highly sensitive instrumentation and sophisticated methods for eliminating environmental magnetic interference.

The I-LABS MEG Brain Imaging Center system allows co-registration of EEG and MEG. Some imaging tests and treatments have special pediatric considerations. Whether a child requires sedation depends on the child's age and the type of exam. Please type your comment or suggestion into the text box below.
MEG signals are obtained directly from neuronal electrical activity.

Your doctor will advise you on any eating and drinking restrictions and whether you may take your regular medications as usual.

This page was reviewed on March 18, 2020



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