10 20 system of eeg
- 1. Electrode placement- 10-20 systems BY -RAKESH KUMAR
- 2. MAJOR LAND MARK Nasion-base of nose where nasal and frontal bone unite.
- 3. Inion - prominent point on occipital protuberance MAJOR LAND MARK
- 4. MAJOR LAND MARK CC Auricular points Is just anterior to the tragus at root of helix
- 5. Central point Cz localization First a measurement is taken from Nasion to Inion
- 6. CC Second measurement from one tragus to other side tragus Central point Cz localization
- 7. Cz-intersection point of the AP and coronal measurement cz Central point Cz localization
- 8. Anterior to posterior measument z z z z The first measurement is in the anterior-posterior plane through the vertex, taken from the Nasion to the Inion.
- 9. Anterior to posterior measument z z z z 1 This AP Measurement divided into 5 segments- Fp,Fz,Cz,Pz,Oz
- 10. Anterior to posterior measument z z z z 2 This AP Measurement divided into 5 segments- Fp,Fz,Cz,Pz,Oz
- 11. Anterior to posterior measument z z z z 3 This AP Measurement divided into 5 segments- Fp,Fz,Cz,Pz,Oz
- 12. Anterior to posterior measument z z z z 4 This AP Measurement divided into 5 segments- Fp,Fz,Cz,Pz,Oz
- 13. Anterior to posterior measument z z z z 1 5 This AP Measurement divided into 5 segments- Fp,Fz,Cz,Pz,Oz
- 14. Anterior to posterior measument z z z z The first mark is placed at 10% posterior to Nasion of the total measurement and labelled Fp.
- 15. z z z z z The second, third, fourth and fifth marks are placed at 20% intervals of the total measurement and label Fz, Cz, Pz, and Oz . Anterior to posterior measument
- 16. z z z z z The second, third, fourth and fifth marks are placed at 20% intervals of the total measurement and label Fz, Cz, Pz, and Oz . Anterior to posterior measument
- 17. z z z z z The second, third, fourth and fifth marks are placed at 20% intervals of the total measurement and label Fz, Cz, Pz, and Oz . Anterior to posterior measument
- 18. z z z z z z z The second, third, fourth and fifth marks are placed at 20% intervals of the total measurement and label Fz, Cz, Pz, and Oz . Anterior to posterior measument
- 19. Lateral measurement of the central coronal plane starts at the left preauricular point, Just anterior To tragus through the Cz to the right preauricular point. Coronal measurement
- 20. Coronal measurement Lateral measurement of the central coronal plane starts at the left preauricular point, Just anterior To tragus through the Cz to the right preauricular point.
- 21. Coronal measurement Lateral measurement of the central coronal plane starts at the left preauricular point, Just anterior To tragus through the Cz to the right preauricular point.
- 22. Coronal measurement Lateral measurement of the central coronal plane starts at the left preauricular point, Just anterior To tragus through the Cz to the right preauricular point.
- 23. A mark is placed at 10% of this measurement from the preauricular points and labelled T3 on left and T4 on right Coronal measurement
- 24. Coronal measurement A mark is placed at 10% of this measurement from the preauricular points and labelled T3 on left and T4 on right
- 25. A mark is placed in that line of 20 % of total length on both side are marked C3 and C4 from T3 and T4 respectively.. Coronal measurement
- 26. A mark is placed in that line of 20 % of total length on both side are marked C3 and C4 from T3 and T4 respectively.. Coronal measurement
- 27. Circumferential measurement A circumferential measurement is then taken over the temporal lobes from the midline Fp position to the midline O position through T3 and T4 in left and right side respectively.
- 30. Circumferential measurement A mark is 10 % from Fp to either side as Fp1 and Fp2.
- 31. Fp2 A mark is 10 % from Fp to either side as Fp1 and Fp2. Circumferential measurement
- 32. F8 Fp2 20 % of total length at that line from Fp1 and Fp2 is F7 in Left and F8 in right Circumferential measurement
- 33. F8 Fp2 20 % of total length at that line from Fp1 and Fp2 is F7 in Left and F8 in right Circumferential measurement
- 34. 20 % of T3 and T4 at same line are T5 and T6 left and right side Circumferential measurement
- 35. T6 T4 20 % of T3 and T4 at same line are T5 and T6 left and right side Circumferential measurement
- 36. O2 10% from Oz in left is O1 and right is O2 Circumferential measurement
- 37. O2 10% from Oz in left is O1 and right is O2 Circumferential measurement
- 38. Para sagittal measurement Intersection point of the Fp1 to C3 and F7 to Fz is F3 in left.
- 39. intersection point of the Fp2 to C4 and Fz to F8 is F4 in right Para sagittal measurement
- 40. Intersection point of the C3 and O1 and T5 and Pz is P3 in left Para sagittal measurement
- 41. intersection point of the C4 and O2 and T6 to Pz is P4 in right Para sagittal measurement
- 43. Extra electrodes in NIMHANS T1,T2 Line is drawn from tragus to outer cantus to both side
- 44. Line is drawn from tragus to outer canthus to both side Extra electrodes in NIMHANS T1,T2
- 45. 1/31/3 A point is taken on this line that is 1/3 of total length from tragus to outer canthus Extra electrodes in NIMHANS T1,T2
- 46. 1 cm 1 cm Point is taken from 1 cm vertical from this point on that horizontal line Extra electrodes in NIMHANS T1,T2
- 47. Extraelectrodesin NIMHANS T1,T2 1 cm 1 cm T2 T1 This mark is final for T2 in right side and T1 in left side
- 49. F F F P 9 F8 F7 Extra electrodes in NIMHANS F9 &F10 FZFZ A line is drawn from F8 to F7 that is passing through Fz
- 50. F F F P 9 F8 F7 FZFZ 10%10% Vertical downward a point is taken from F7 and F8 this is 10% of total measurement from F8 to F7,on each side Extra electrodes in NIMHANS F9 &F10
- 51. F F F P 9 F8 F7 FZFZ 10%10% Vertical downward a point is taken from F7 and F8 this is 10% of total measurement from F8 to F7,on each side Extra electrodes in NIMHANS F9 &F10
- 52. F F F P 9 F8 F7 Extraelectrodesin NIMHANS F9 &F10 FZFZ 10% F9F10 10% This final point on each side are F9 and F10 in left and right Respectively