Artifacts in EEG - Recognition and differentiation
29
Artifacts in EEG Artifacts in EEG Dr. Rahul Kumar Dr. Rahul Kumar
-
Upload
drrahulkumarsingh -
Category
Health & Medicine
-
view
1.118 -
download
3
description
This Presentation discusses the variously commonly seen artifacts in EEG, and how to recognize them. In EEG interpretation, it is often more important to identify an artifact than to identify true pathology. Once all the artifacts are ruled out, one is sure that what one is dealing with represents disease/abnormality
Transcript of Artifacts in EEG - Recognition and differentiation
Artifacts in EEGArtifacts in EEG
Dr. Rahul KumarDr. Rahul Kumar
Recording EEGRecording EEG EPSP at apical dentritic EPSP at apical dentritic
trees of pyramid cellstrees of pyramid cells Dentritic membrane Dentritic membrane
depolarizeddepolarized Potential difference Potential difference
cause a current cause a current flow flow through volume through volume conductor from the conductor from the nonexited membrane of nonexited membrane of the soma to the apical the soma to the apical dentritic treedentritic tree
Extracellular currents = Extracellular currents = secondary / volume secondary / volume currentscurrents
The EEG machineThe EEG machine 8 – 64 identical 8 – 64 identical
channels recording channels recording simultaneously from as simultaneously from as many different pairs of many different pairs of electrodeselectrodes
Electrodes & electrode Electrodes & electrode boardboard
AmplifiersAmplifiers FiltersFilters Pen & chartdrive Pen & chartdrive
(screen)(screen)
ArtifactsArtifacts
Physiologic artifactsPhysiologic artifacts Eye movement Eye movement Muscle activityMuscle activity ECG artifactsECG artifacts Skin artifactsSkin artifacts
Extraphysiologic Extraphysiologic artifactsartifacts
ElectrodesElectrodes Alternating current Alternating current
(60 Hz) artifact(60 Hz) artifact Movements in the Movements in the
enviromentenviroment
Photomyoclonic Response
NHIỄU (ARTIFACTS) NHIỄU (ARTIFACTS)
NHIỄU (ARTIFACTS) NHIỄU (ARTIFACTS)
NHIỄU (ARTIFACTS) NHIỄU (ARTIFACTS)
NHIỄU (ARTIFACTS) NHIỄU (ARTIFACTS)
NHIỄU (ARTIFACTS) NHIỄU (ARTIFACTS)
SUMMARYSUMMARY
Artefacts in EEG RecordingsArtefacts in EEG Recordings
Artefacts in EEG RecordingsArtefacts in EEG Recordings
Artefacts in EEG RecordingsArtefacts in EEG Recordings
