Abstract #3811

Magnetic Field Mapping for Transcranial Direct Current Stimulation on human brain: a preliminary study

Fábio Seiji Otsuka¹, Carlos Ernesto Garrido Salmon¹, Iman Ghodratitoostani^2,3, Zahrasadat Vazirikangolya^2,4, Renan Maatsuda⁵, Abhishek Datta⁶, and Chris Thomas⁶

¹Inbrain Lab, Department of Physics, Faculty of Phylosophy, Sciences and Letter of Ribeirão Preto (FFCLRP), University of São Paulo (USP), Ribeirão Preto, Brazil, ²Neurocognitive Engineering Laboratory (NEL), Institute of Mathematics and Computer Sciences, University of São Paulo (USP), São Carlos, Brazil, ³Reconfigurable Computing Laboratory, Institute of Mathematics and Computer Science, University of São Paulo (USP), São Carlos, Brazil, ⁴Department of Neuroscience and Behavioral Sciences, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil, ⁵Biomag Lab, Department of Physics, Faculty of Phylosophy, Sciences and Letter of Ribeirão Preto (FFCLRP), University of São Paulo (USP), Ribeirão Preto, Brazil, ⁶Soterix Medical, New York, NY, United States

Two methods to map the magnetic field distributions generated by tDCS’s electric currents using MRI were evaluated in this work. First method Stimulus/Rest Difference and second GLM. Phase images were preprocessed using motion parameters calculated by SPM from the magnitude images. To evaluate the results, simulated magnetic field distribution was calculated using simulated data for the electric current distribution. The first method showed similarities with simulated data except for one case, while the second method showed magnetic field variations only at occipital region. These results points toward the possibility of mapping these very low intensity magnetic fields using MRI.

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