Abstract
This work proposes a simple method to carry out in lab a direct measurement of the primary solenoidal electric field that transcranial magnetic stimulation coils generate in the brain. This method avoids indirect estimation of this electric field from measurements of magnetic fields, and at the same time, overcomes the difficulty posed by the presence of a dominant conservative electric field, also produced by the coil. This conservative electric field, which is removed in practice by human tissue, is eliminated in the proposed measurement method by using a simple setup that does not require the introduction of the measurement probe inside a conducting solution resembling the human tissue. The proposed measurement method allows for measuring the primary solenoidal electric field in front of the coil in the air. This method has been validated by comparing the results of electromagnetic simulation with the measurement of the magnetic field and the non-conservative electric field produced by a commercial transcranial magnetic stimulation coil.
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