Table 1.

Typical execution times of IELU pipeline steps

Step	Description	Time (min)	Notes
Registration	CT image registered to the structural MRI using mutual information algorithm in FreeSurfer	~4–12	Execution time varies depending on CT quality and registration parameters
Localization	Morphological filtering; electrodes identified from suprathreshold clusters	1–2	Execution time varies depending on number of suprathreshold clusters and CT size
Noise removal	Electrodes far from brain mask are removed	<1
Sorting	Electrodes organized into likely grid configurations matching user-specified geometry	1–3	Execution time varies depending on number of grids implanted and amount of image noise
Interactive adjustment	User reviews and makes corrections to electrode positions, sorting assignments	~5–10	Varies considerably depending on complexity of implantation configuration and CT quality
Labeling	Electrodes associated with channel names. User corrects for rotation or reflection	1
Snapping	Electrodes projected to smoothed pial surface and adjusted based on potential energy of invisible springs	2–3	Execution time varies depending on annealing parameters
Total		~15–30