Table 1.

Parameter values determined from expert neurosurgeons. $d_{\mathrm{angle}}$ is the largest angle safely realised with a surgical drill

Parameter	Value
$d_{\mathrm{length}}$	80.0 mm
$d_{\mathrm{angle}}$	${25}^{\circ }$
$d_{\mathrm{safety}}$	3.0 mm
$d_{\mathrm{risk}}$	10.0 mm
J	10
$c_j$	6 mm intervals from electrode tip
$c_r$	1.2 mm
$d_{\mathrm{traj}}$	10.0 mm
K	10

$d_{\mathrm{length}}$ is the longest electrode. $d_{\mathrm{safety}}$ is the “Safety Margin”, below which trajectories have the highest risk $(R_{i,a_i}=1)$. $d_{\mathrm{risk}}$ is the “Risk Zone”, above which trajectories have no risk $(R_{i,a_i}=0)$. J, $c_j$, and $c_r$ are the number, position, and sampling radius of electrode contact points for a commonly used SEEG electrode. $d_{\mathrm{traj}}$ is the minimum distance for no electrode conflict. K is the number of histogram bins