Med Biol Eng Comput - Mixed-signal template-based reduction scheme for stimulus artifact removal in electrical stimulation.

Tópicos

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Resumo

Simultaneous electrical stimulation and recording are used to gain insights into the function of neuronal circuitry. However, artifacts produced by the electrical stimulation pulses prevent the recording of neural responses during, and a short period after, the stimulation duration. In this work, we describe a mixed-signal recording topology with template subtraction for removing the artifact during the stimulation pulse. Emulated artifacts generated from a lumped electrical circuit model and experimental artifacts in cardiac cell cultures are used to evaluate the topology. The simulations show that delays between the emulated artifact and its estimated compensation template represent the largest error source of the analog template subtraction. The quantization error appears like random noise and determines the threshold level for the action potential detection. Simulations show that removal of the artifacts is possible, allowing the detection of action potentials during the stimulation pulsing period, even for high-amplitude saturating artifacts. Measurement results with artifacts elicited in cardiac cell cultures show feasible applications of this topology. The proposed topology therefore promisingly opens up a previously unavailable detection window for improving the analysis of the neuronal activity.

Resumo Limpo

simultan electr stimul record use gain insight function neuron circuitri howev artifact produc electr stimul puls prevent record neural respons short period stimul durat work describ mixedsign record topolog templat subtract remov artifact stimul puls emul artifact generat lump electr circuit model experiment artifact cardiac cell cultur use evalu topolog simul show delay emul artifact estim compens templat repres largest error sourc analog templat subtract quantiz error appear like random nois determin threshold level action potenti detect simul show remov artifact possibl allow detect action potenti stimul puls period even highamplitud satur artifact measur result artifact elicit cardiac cell cultur show feasibl applic topolog propos topolog therefor promis open previous unavail detect window improv analysi neuron activ

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