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. 2016 Jun 30;10:47. doi: 10.3389/fncir.2016.00047

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Copyright © 2016 Tang, Lowe, Garrett, Woodward, Bennett, Canty, Garry, Hinder, Summers, Gersner, Rotenberg, Thickbroom, Walton and Rodger.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Characterization of coil properties. Magnetic field decay in the z (A) and xy (B) axes where 0 is the center of the coils, shows the iron-core coil produced a greater peak magnetic field (119.05 mT) than the air-core coil (89.50 mT) with a trade-off of focality. Half-maximum field occurred at ~1.2 mm_z _axis, ~3.5 mm_xy _axis (air-core) and ~2 mm_z _axis, ~4 mm_xy _axis (iron-core). Changes in the iron-core coil temperature during 600 pulses of 1 and 10 Hz rTMS (C) shows tolerable changes in temperature (≤Δ5°C) at both frequencies. 10 Hz stimulation with the air-core coil resulted in a large temperature change (~Δ17.5°C). Magnetic field stability (D) shows the iron-core coil shows high stability at both 1 and 10 Hz stimulation. Magnetic field stability for the air-core coil at 10 Hz significantly decreased (^∗p < 0.001) at 10 Hz.