A smaller patient cohort from a database of CT volumes, made available by Mayo Clinic (200 First St. SW Rochester, MN 55,905, USA) on the IEEG public repository [18], was also considered. In particular, only the studies feature a complete head volume and a resolution comparable to electrodes size. The CT volumes including only ECoG electrodes were first considered in the analysis, that is, the ones with Mayo patient IDs #12, #16, #20, #22, #26, #28, #31 (two females and five males, age 17.4 ± 13.8 years).

Moreover, the CT volumes with penetrating depth electrodes (arrays of coaxial sleeve-shaped electrodes arranged on a thin tip) were also considered, i.e., the ones with Mayo patient IDs #5, #17, #27 (one female and two males, age 33.0 ± 6.56 years). In particular, the first two include only depth electrodes, while the third includes both depth and ECoG electrodes. Table S2 reports the number of implanted ECoG electrodes, strips, grids, depth electrodes, depth contacts and other metal objects per patient.

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