Digital Eeg

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An electroencephalogram (EEG) records and measures electrical activity in the brain and is used to help diagnose seizure disorders, screen for delirium and dementia, evaluate head injuries, and examine brain activity in comatose individuals. While the introduction of digital EEGs carries the promise of better accuracy, it requires that physicians and technologists be specially trained.This sophist...
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Neurologische Universitatsklinik Eppendorf, Hamburg, Germany. Brain Dynamics Series. Selected papers from the symposium of the same name sponsored by the German EEG Society in Hamburg on September 28-29, 1992. Experimental and clinical research. 32 contributors, 2 U.S. Illustrated. ...

Digital Eeg
What are the functions and misconceptions of functions of an isolated patient “ground” used in DIGITAL EEG?

The fact that storage/display of the data is “digital” doesn’t matter to this process. The sensors are still acquiring analog data (and weak data at that) — it’s just being digitized downstream after amplification. The standard checks for ground leakage, cord resistance, etc., should be performed as for any analog EEG.

Every sensor (other than balanced input sensors) will require a ground reference. The IPG is a return only for the EEG electrodes. It is not connected to “earth” (hence it is referred to as “isolated”) – specifically to avoid any return path through the patient in the event that an equipment fault should occur that would cause dangerous earth referenced voltage to appear at the EEG electrodes.

At 120VAC, I believe there should be less than 10uA rms leakage possible.

I suppose one misconception is that the patient is being “grounded” (”earthed”), although that would be precisely the opposite of the desired result.

See UL2601-1 and IEC 60601-1 standards.

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