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Mohibullah Fazli Kakar
PT, NP Technologist
3rd
year medical student
FMIC; April 2018
Electroencephalography
10 – 20 system electrode placement
What is 10 – 20 system
An internationally recognized method that allows EEG
electrode placement to be standardized.
OR
The 10-20 System of Electrode Placement is a method
used to describe the location of scalp electrodes
The 10-20 system is based on the relationship between
the location of an electrode and the underlying area of
cerebral cortex.
Each site has a letter and a number or another letter to
identify the hemisphere location.
The letters F, T, C, P, and O stand for Frontal,
Temporal, Central, Parietal and Occipital.
Even numbers (2,4,6,8) refer to the right hemisphere
Odd numbers (1,3,5,7) refer to the left hemisphere.
The z refers to an electrode placed on the midline.
What is 10 – 20 system
Four Skull Landmarks:
Nasion
Inion
Left Pre auricular point‐
Right Pre auricular point‐
What is 10 – 20 system
Pre – Auricular point
Measuring FPz or Reference Electrode:
Measure the distance from nasion to inion
 measure 10% of all distance from nasion and mark for
Reference electrode in the front.
Measuring Oz:
Measure the distance from nasion to inion
 measure 10% of all distance from inion and mark for Oz
in the back.
What is 10 – 20 system
Note:
•Every 10% = 20%
•Every 10% / 2 = 10%
Measurement of CZ:
Measure the distance from FPz to Oz and divide/ 2 = CZ
Measurement of FZ:
Measure the distance form CZ – Ref
divide by 2 = Fz
Measurement of PZ :
Measure the distance from Cz – Oz divide / 2 = PZ
What is 10 – 20 system
FPZ
Measurement of FP1 and FP2:
Measure the distance head circumference and take 10% of all
measurement divide / 2 mark it:
On left side for FP1
On right side for FP2
Measurement of F7 and F8:
Measure the distance head circumference and take 10% of all
measurement
Mark 10% by measuring for every led
What is 10 – 20 system
Measurement of T3 and T4:
Measure the distance between pre – auricular points and cross
Cz
Mark 10% of the distance from left and right pre – auricular
points of ears.
Left for T3
Right for T4
What is 10 – 20 system
Measurement of T5 and T6:
Measure the distance head circumference and take 10% of all
measurement
Mark 10% by measuring for every led
FPz 10%  F7 10%  T3 10%  T5 10%
FPz 10%  F8 10%  T4 10%  T6 10%
What is 10 – 20 system
Measurement of F3 and F4:
Measure the distance from F7 – Fz / 2
Mark on the left for F3
Mark on the Right for F4
What is 10 – 20 system
Measurement of C3 and C4:
Measure the distance form CZ – T3 / 2 = C3
Measure the distance form CZ – T4 / 2 = C4
Measurement of P3 and P4:
Measure the distance from T5 – PZ / 2
Mark on the left for P3
Mark on the Right for P4
What is 10 – 20 system
Measurement of O1 and O2:
 Measure the distance head circumference and take 10% of all
measurement mark it:
On Left side for O1 = T5 10% = O1
On Right side for O2 = T6 10% = O2
What is 10 – 20 system
10 and 20 electrode placement

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10 and 20 electrode placement

  • 1. Mohibullah Fazli Kakar PT, NP Technologist 3rd year medical student FMIC; April 2018 Electroencephalography 10 – 20 system electrode placement
  • 2. What is 10 – 20 system An internationally recognized method that allows EEG electrode placement to be standardized. OR The 10-20 System of Electrode Placement is a method used to describe the location of scalp electrodes
  • 3. The 10-20 system is based on the relationship between the location of an electrode and the underlying area of cerebral cortex. Each site has a letter and a number or another letter to identify the hemisphere location. The letters F, T, C, P, and O stand for Frontal, Temporal, Central, Parietal and Occipital. Even numbers (2,4,6,8) refer to the right hemisphere Odd numbers (1,3,5,7) refer to the left hemisphere. The z refers to an electrode placed on the midline. What is 10 – 20 system
  • 4. Four Skull Landmarks: Nasion Inion Left Pre auricular point‐ Right Pre auricular point‐ What is 10 – 20 system
  • 6. Measuring FPz or Reference Electrode: Measure the distance from nasion to inion  measure 10% of all distance from nasion and mark for Reference electrode in the front. Measuring Oz: Measure the distance from nasion to inion  measure 10% of all distance from inion and mark for Oz in the back. What is 10 – 20 system Note: •Every 10% = 20% •Every 10% / 2 = 10%
  • 7. Measurement of CZ: Measure the distance from FPz to Oz and divide/ 2 = CZ Measurement of FZ: Measure the distance form CZ – Ref divide by 2 = Fz Measurement of PZ : Measure the distance from Cz – Oz divide / 2 = PZ What is 10 – 20 system FPZ
  • 8. Measurement of FP1 and FP2: Measure the distance head circumference and take 10% of all measurement divide / 2 mark it: On left side for FP1 On right side for FP2 Measurement of F7 and F8: Measure the distance head circumference and take 10% of all measurement Mark 10% by measuring for every led What is 10 – 20 system
  • 9.
  • 10. Measurement of T3 and T4: Measure the distance between pre – auricular points and cross Cz Mark 10% of the distance from left and right pre – auricular points of ears. Left for T3 Right for T4 What is 10 – 20 system
  • 11. Measurement of T5 and T6: Measure the distance head circumference and take 10% of all measurement Mark 10% by measuring for every led FPz 10%  F7 10%  T3 10%  T5 10% FPz 10%  F8 10%  T4 10%  T6 10% What is 10 – 20 system
  • 12. Measurement of F3 and F4: Measure the distance from F7 – Fz / 2 Mark on the left for F3 Mark on the Right for F4 What is 10 – 20 system
  • 13. Measurement of C3 and C4: Measure the distance form CZ – T3 / 2 = C3 Measure the distance form CZ – T4 / 2 = C4 Measurement of P3 and P4: Measure the distance from T5 – PZ / 2 Mark on the left for P3 Mark on the Right for P4 What is 10 – 20 system
  • 14. Measurement of O1 and O2:  Measure the distance head circumference and take 10% of all measurement mark it: On Left side for O1 = T5 10% = O1 On Right side for O2 = T6 10% = O2 What is 10 – 20 system