Sound comparison of seven TMS coils at matched stimulation strength

Published: 13 May 2020| Version 1 | DOI: 10.17632/jb93vbfkwr.1
Contributors:
Lari Koponen,
Stefan Goetz,
Debara Tucci,
Angel Peterchev

Description

The supplementary dataset for “Sound comparison of seven TMS coils at matched stimulation strength”, Brain Stimulation, 13(3), 873-880, 2020. The dataset contains sound waveforms of TMS coil click captured at 25 cm and 100 cm from the coil, in Pascals. There are seven coils in this dataset, and for each coil sound has been recorded at 10 stimulator output settings, 10 TMS pulses at each setting. The sampling rate was 192 kHz, and the waveforms were stored in single-precision floating-point format. The sound waveforms are in a MATLAB struct “sound” stored in a file “sound.mat” which is in the file “sound_mat.zip”. For each coil and intensity, the dataset further contains the electric field waveform for an 85 mm spherical phantom, in volts per meter. From these waveforms we have further estimated the stimulation strength in % RMT for an average subject. The electric field recordings and derived stimulation strengths are in a MATLAB struct “stimulation” stored in a file “stimulation.mat” which is in the file “stimulation_mat.zip”. Further, the dataset contains the technical drawings of the electric-field measurement probe for the spherical phantom in a file “probe.zip”. The file contains Gerber files for a two-layer printed-circuit-board probe, an STL file for the 3d-printed probe holder, and an SVG drawing of the laser-cut alignment plate. Our main findings from the data are summarized by the highlights of the article: • Coil click varies by over 20 dB between TMS coils at matched stimulation strength. • Close to a TMS coil, airborne sound pressure level may reach nearly 140 dB(Z). • During rTMS, continuous airborne sound level may exceed 110 dB(A). • Sound level of rTMS may exceed some standard safety limits for both subject and operator. For more information, refer to the article and its supplement.

Files

Steps to reproduce

The measurement setup, including the used equipment, is described in the referenced article and its supplement: “Sound comparison of seven TMS coils at matched stimulation strength” Brain Stimulation, 13(3), 873-880, 2020.