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FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
FUNCTIONAL DIAGNOSTICS
E E G
Copyright MFD 2001 - Any kind of reproduction is prohibited
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Electroencephalography EEG
The EEG plays an important role
in the diagnosis of diseases that
affect the cerebral hemispheres
such as:
Epilepsy
Stroke
Tumors
Infection
Degenerative illnesses
Delirium
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
EEG Recordings
Fp2-T4
T4 -O2
Fp2-C4
C4 -O2
Fp1-T3
T3 -O1
Fp1-C3
C3 -O1
Electrodes
10-20 montage
Left frontal activity
Tracing
Longitudinal bipolar montage
Mapping
Power spectrum
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
10-20 Montage
Nasion
Inion
10%
10%20%
20%
20%
20%
Pg2
Cz
Pz
Fz
A2
Oz
Fpz
Cz
Pz
Oz
A2A1
C4
T4
C3
T3
10%
20%
20% 20%
20%
10%
Nasion
Inion
Left Right
Fp1 Fp2
T3 T4CzC3 C4
F7 F8
F3 F4Fz
PzP3 P4
T5 T6
O1 O2
Pg1 Pg2
A1 A2
25%
25%
25%
25%
Nasion
Inion
Left Right
Fp1 Fp2
T3 T4CzC3 C4
F7 F8Fz
Pz
T5 T6
O1 O2
A1 A2
10%
10%
20%
20%
20%
20%
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Connections to Patient
Fp2
F4
Nasion
Inion
Left Right
Fp1 Fp2
T3 T4CzC3 C4
F7 F8
F3 F4Fz
PzP3 P4
T5 T6
O1 O2
Pg1 Pg2
A1 A2
Imp.
X Poly
1
2
3
1
2
3
Fp1 Fp2
F7 F3 F4 F8
Fz
A1 T3 C3 Cz C4 T4 A2
PzP3 P4
T5 T6
O1 O2
Ground
Reference
C4
P4
Fp2-Ref
C4-Ref
F4-Ref
P4-Ref
Ground
Reference
Use Nuprep gel to prepare the skin before placing electrodes
Use Ten20 conductive and adhesive paste to fix surface electrodes
Electrode impedance must be < 5 KΩ
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Montages
Nasion
Inion
Left Right
Fp1 Fp2
T3 T4CzC3 C4
F7 F8
F3 F4Fz
PzP3 P4
T5 T6
O1 O2
Pg1 Pg2
A1 A2
Bipolar Longitudinal
For comparison of
left-right differences
Nasion
Inion
Left Right
Fp1 Fp2
T3 T4CzC3 C4
F7 F8F3 F4Fz
PzP3 P4
T5 T6
O1 O2
Pg1 Pg2
A1 A2
Common Reference
To estimate actual
voltages
Nasion
Inion
Left Right
Fp1 Fp2
T3 T4CzC3 C4
F7 F8F3 F4Fz
PzP3 P4
T5 T6
O1 O2
Pg1 Pg2
A1 A2
Bipolar Transversal
For comparison of
left-right differences
Nasion
Inion
Left Right
Fp1 Fp2
T3 T4CzC3 C4
F7 F8
F3 F4Fz
PzP3 P4
T5 T6
O1 O2
Pg1 Pg2
A1 A2
Linked Ear Reference
To estimate actual
voltages and analyze
temporobasal activities
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Signals versus Montages
ipsilateral ear common average source derivation bipolar
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Frequency Bands
13
8
4
7
Theta
Alpha
Slow
waves
14
+
BetaFast
waves
3
0
Delta
1 sec.
Delta
Theta
Alpha
Beta
Alpha
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Eyes Open
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Hyper Ventilation
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Photic Stimulation
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Spikes & Sharp Waves
Sharp Wave
Spike
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Patient Artifacts
ECG interferences
F1
F2
ECG
F2
ECG
Artery pulses
Fp1
Fp2
F3
F4
Eye movement
Sweat
Fp1
Fp2
electrode
artery
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Electrodes Artifacts
Electrode movement
Defective scalp contact
Bad connection to
electrode clip
Bad connection
to input socket
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Amplitude Mapping
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Power Spectrum & Frequency Mapping
Power Spectrum Frequency Mapping
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
Electrodes & Conductive Paste
Surface Electrodes
9013S0501 Length 100cm
10 pcs
9013C0181 Length 100cm
10 pcs
Flat Bristle
Disposable EEG Cups Diam 10mm
Flat Bristle
30pcs 9013S0511 9013S0531
500pcs 9013S0521 9013S0541
Nuprep
9015B4772
Skin Prepping
Gel - 114 g.
Paste
9015B4712
Conductive
Adhesive Paste
228 g.
9013R0312
Disposable Needle
Box of 40 pcs
Lgth 10mm D.0.3
Needle Electrodes
9013P0782 Length 80cm
8 pcs
FUNCTIONAL DIAGNOSTICS
NEURODIAGNOSTICS
FUNCTIONAL DIAGNOSTICS
Thanks!

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EEG ~ Dr. Tarek Asaad