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Abstract #3811

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

Fábio Seiji Otsuka1, Carlos Ernesto Garrido Salmon1, Iman Ghodratitoostani2,3, Zahrasadat Vazirikangolya2,4, 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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