High Density EEG Testing
At CNNH, we are proud to provide the latest in non-invasive EEG technology: High Density Electroencephalography (HD-EEG) using the Geodesic® EEG System 250 from Electrical Geodesics, Inc. (EGI). HD-EEG is an improvement on conventional approaches to EEG, as it uses a much larger number of sensors (small saline soaked sponges that record the electrical brain activity) for superior accuracy and detection of abnormalities. Typical EEG systems use between 18-24 sensors where as our system uses 128 sensors for whole head coverage and a detailed, 3-dimensional picture of brain activity.
EGI has devised an ingenuous way to apply the large number of sensors (128 in our system) by devising a “net” that can apply the sponge electrodes in minutes. The application is quick and painless, reduces patient anxiety about the test and, therefore, increases compliance. Additionally, the net application does not require the need for sedation, and since there is no abrasion of the scalp, and no gluing, as is typical with conventional EEG’s, risk of infection is reduced.
Our HD-EEG technicians have specialized training and experience in the use of dense array apparatus, and strive to create a comfortable, soothing experience for our patients without the need for sedation. Comfortable chairs and TV/Video Games are provided to keep patients occupied. In extreme cases, our behavior therapists are available to assist our HD-EEG technicians in calming down distressed patients. Since even the most sensitive patients handle the testing well, the resulting data is more reliable for our doctors than conventional EEG systems.
HD-EEG is a useful clinical tool in our office for the detection of electrical abnormalities associated with seizure activity (i.e. Epilepsy) but can also be useful for detecting “subclinical” low-level brain activity that might be contributing to many other disorders. This low level “subclinical” activity was not previously detectable with conventional EEG, and allows our clinicians to make nuanced and sometimes life-changing diagnoses… diagnoses that would have not been possible before the advent of High Density EEG technology.
Because HD-EEG testing can detect very low-level brain activity, any subtle abnormalities detected can give our doctors insights into a wide range of disorders, not just limited to seizure activity.
HD-EEG is a way to electrically “image” the brain, as the sensor data is run through a powerful computer that allows the location of abnormal brain activity to be determined with great accuracy. This data can then be mapped directly onto an MRI. High Density EEG (previously known as dense array EEG) is widely used for research applications investigating aspects of brain function and mind control, and has been featured on the cover of National Geographic and Newsweek. However, CNNH is the one of the leading clinical providers in the nation that recognizes the value of this technology in the clinical realm to help our doctors make more accurate and thorough diagnoses.
Anyone can get HD-EEG testing done at CNNH, you do not have to be a CNNH patient in order to schedule an HD-EEG test. We often get referrals from other doctors to perform HD-EEG testing on their patients as our testing service is unique and invaluable.
128+ Sensor Whole Head Coverage
Improved accuracy and the ability to localize the source of abnormal electrical brain activity. The large amount of electrodes, which completely surround the head, allow our clinicians to see more detailed brain activity for more sophisticated diagnoses.
– “Whole head” coverage to identify source of electrical brain activity
– Electrical sources can be mapped onto MRI
– Necessary technology to determine localized brain abnormalities, pre-surgical planning, and overall patient management
– Clearer and more accurate imaging of brain activity
HD-EEG is Quick and Painless
The application process is quick, painless and comfortable, meaning no sedation or restraint is necessary. The sensor net is comprised of sponges and water, there is no unpleasant scraping and gluing of the scalp as is typically done with conventional EEG. This makes it ideal for patients with behavior difficulties and allows for longer recording sessions. And the quick application time allows for longer periods of testing for superior data collection.
Superior to Conventional EEG
Conventional EEG testing has many downsides. The small amount of sensors (18-24) provide a far less complete image of brain activity for poor data collection. Conventional EEG requires scraping and glueing of the scalp causing trauma in sensitive patients, takes a long time to apply causing shorter testing sessions, and has increased risk of infection due to the scraping of the scalp.