Dipole Cancellation as an Artifact Suppression Technique in Simultaneous Electrocorticography Stimulation and Recording
| Autor: | Payam Heydari, Charles Y. Liu, Jeffrey Lim, Haoran Pu, An H. Do, Richard A. Andersen, Spencer Kellis, Zoran Nenadic, Po T. Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Cortical tissue
medicine.diagnostic_test Computer science 0206 medical engineering Stimulation 02 engineering and technology 020601 biomedical engineering Imaging phantom 03 medical and health sciences Dipole 0302 clinical medicine Artifact suppression medicine Electrocorticography 030217 neurology & neurosurgery Polarity (mutual inductance) Biomedical engineering Voltage |
| Zdroj: | NER |
| Popis: | Fully-implantable, bi-directional brain-computer interfaces (BCIs) necessitate simultaneous cortical recording and stimulation. This is challenging since electrostimulation of cortical tissue typically causes strong artifacts that may saturate ultra-low power (ULP) analog front-ends of fully-implantable BCIs. To address this problem, we propose an efficient hardware-based method for artifact suppression that employs an auxiliary stimulator with polarity opposite to that of the primary stimulator. The feasibility of this method was explored first in simulations, and then experimentally with brain phantom tissue and electrocorticogram (ECoG) electrode grids. We find that the canceling stimulator can reduce stimulation artifacts below the saturation limit of a typical ULP front-end, while delivering only ~10% of the primary stimulator’s voltage. |
| Databáze: | OpenAIRE |
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