Table 5.

Data for the maximum current density on the cortical surface for the widened sulci models

Model and position	MCDCS under coil	MCDCS location under coil	VerD scalp	Area
Bws	2.93 (10.61)	(32.9, 43.9, 28.1)	6.9	168.0
95ws	2.38 (8.62)	(34, 41.2, 28.0)	8.9	272.0
90ws	2.26 (8.19)	(37.9, 34.6, 25.3)	11.5	111.0
85ws	1.97 (7.14)	(37.8, 35.6, 22.1)	14.6	78.0
	MCDCS on sulcal edges	MCDCS location on sulcal edges
Bws	3.06 (11.09)	(45.2, 4.1, 28.1)	6.8	5.1
95ws	2.44 (8.84)	(25.3, −2.2, 34.6)	7.9	4.5
90ws	2.42 (8.77)	(24.2, −3.8, 32.6)	10.2	2.2
	Note: two other locations were within ±15% of the under the coil max: at (41.4, 1.83, 24.7) with 2.37 (8.59) magnitude and 3 mm2 area and at (45.2, −0.1, 20.4) with a 2.38 (8.62) magnitude and 4 mm2 area
85ws	2.30 (8.33)	(36.4, 2.06, 24.17)	12.5	9
	Note: three other locations were within ±15% of the under the coil max: at (24.3, −5.3, 30.2) with a 2.05 (7.43) magnitude and 4 mm2 area, at (30.4, −7.2, 20.7) with a 2.21 (8.00) magnitude and 6 mm2 area and at (42.5, −0.4, 19.2) with a 2.09 (7.57) magnitude and a 4 mm2 area

The first column indicates the model and coil position, where Bws stands for base widened sulci model, ws for widened sulci, and the number corresponds to the degree of atrophy (i.e., 85ws indicates the 85% widened sulci model. The second column indicates the maximum current density on the cortical surface (MCDCS), in A/m² both under the coil and along the sulcal border (and the electric field strength in V/m). The third column provides the MCDCS location under the coil and along the sulcal border, while the fourth column indicates the vertical distance from the scalp to the MCDCS location. And the final column reports the maximum cortical current surface area. Note that for the 90ws and 85ws models, there were multiple regions along the border where the current density was with ±15% of the maximum current density under the coil, these are reported in the adjacent row in the table