Seven T MRI scans were performed on a Phillips Achieva 7 T MRI system (Philips Healthcare, Best, the Netherlands) with a 16‐channel receive coil or, after May 2011, a 32‐channel receive head coil combined with dual channel transmit coil (Nova Medical, Wilmington, MA, U.S.A.). From mid‐2015 on, dielectric pads, containing calcium titanate (Leiden University Medical Center, Leiden, the Netherlands), were routinely used to reduce artefacts and signal loss in the temporal regions.27 Pads were placed to the sides of the subject's head. Patients all used ear plugs to protect from acoustical noise.
In our center, 3 T MRI scans were performed with 3 T Philips Achieva with eight‐channel sensitivity encoding (SENSE) head coil. The 3 T is the default machine for epilepsy patients; only on specific indication (e.g., vagal nerve stimulator in situ) and in the past 1.5 T was performed, on a Phillips Achieva 8ch or Philips Ingenia dStream.
In our center, 3 T MRI scans were performed with 3 T Philips Achieva with eight‐channel sensitivity encoding (SENSE) head coil. The 3 T is the default machine for epilepsy patients; only on specific indication (e.g., vagal nerve stimulator in situ) and in the past 1.5 T was performed, on a Phillips Achieva 8ch or Philips Ingenia dStream.