Table 1.

RePE positioning via 3D head MRI distances vs. Neuronavigation.

Session	Neuronavigation (mm)				3D head model MRI distances (mm)
	Distance	X	Y	Z	Distance	X	Y	Z
1	3.1 ± 1.4	1.1 ± 2.9	0.5 ± 2.8	−0.8 ± 2.7	3.7 ± 0.6	1.9 ± 2.7	−3.1 ± 4.1	2.0 ± 3.9
2	2.6 ± 1.5	0.4 ± 3.0	−0.6 ± 3.1	−0.4 ± 2.2	2.5 ± 0.5	1.5 ± 2.7	−2.3 ± 4.3	2.8 ± 4.9
3	2.7 ± 1.3	0.9 ± 2.1	−1.9 ± 1.6	0.7 ± 2.3	3.7 ± 0.5	−2.0 ± 3.7	2.3 ± 4.4	0.9 ± 3.7
4	3.4 ± 1.1	1.4 ± 3.3	0.0 ± 2.2	0.5 ± 2.4	4.2 ± 0.7	2.0 ± 3.0	2.0 ± 2.7	−3.9 ± 2.6
5	3.0 ± 0.6	1.3 ± 2.7	−1.4 ± 4.2	1.2 ± 3.6	3.8 ± 1.2	0.8 ± 3.5	−0.2 ± 4.6	2.5 ± 5.0
Overall	3.0 ± 1.2	1.0 ± 2.8	−0.7 ± 2.8	0.2 ± 2.6	3.5 ± 0.8	0.8 ± 3.3	−2.8 ± 4.3	0.3 ± 2.1

Mean displacements between each of the 27 RePEpoints in each electrode and the corresponding point of the scalp projection of the central sulcus, both as Euclidean distance (Distance) and the differences of each of the three Cartesian coordinates (x, y, z), when the personalized electrode was positioned either using the neuronavigated procedure or the distances derived from the 3D-head model from individual MRI.