SCHEMATIC DIAGRAM OF AN EEG MACHINE

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Presentation transcript:

SCHEMATIC DIAGRAM OF AN EEG MACHINE

EEG Transducer(Recording set up)

EEG Transducer(Recording set up) Electro encephalography - study of electrical activities of the brain. Electrodes attached to different parts of the skull of a patient. 8 channel EEG recorder:- Patient cable consists of 21 electrodes Electrodes connected to selector in groups of 8- Montage of electrodes Right ear electrode  reference electrode right brain electrodes Left ear electrode  reference electrode left brain electrodes

EEG Transducer(Recording set up) Interference problem is reduced by differential amplifier(preamplifiers) Filter bank:- consists of appropriate filters to select different types of brain waves. Output can be given to 8-channel pen recorder, display unit, computer storage memory for further processing. Evoked Potential:- Measure of the “disturbance” in the EEG pattern that results from external stimuli. Time delay between stimulus and response can be measured in signal processing unit.

BRAIN WAVES Alpha waves-normally persons Awake and alert ,occipital region. Beta waves- recorded from parietal and temporal regions. Theta waves- recorded from parietal and temporal regions of Children, adults- emotional stress Delta waves-deep sleep, premature babies, every serious organic brain diseases.