Med Biol Eng Comput - A novel method for recording neuronal depolarization with recording at 125-825?Hz: implications for imaging fast neural activity in the brain with electrical impedance tomography.

Tópicos

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Resumo

Electrical impedance tomography (EIT) is a recently developed medical imaging method which has the potential to produce images of fast neuronal depolarization in the brain. Previous modelling suggested that applied current needed to be below 100?Hz but the signal-to-noise ratio (SNR) recorded with scalp electrodes during evoked responses was too low to permit imaging. A novel method in which contemporaneous evoked potentials are subtracted is presented with current applied at 225?Hz to cerebral cortex during evoked activity; although the signal is smaller than at DC by about 10?, the principal noise from the EEG is reduced by about 1000?, resulting in an improved SNR. It was validated with recording of compound action potentials in crab walking leg nerve where peak changes of -0.2% at 125 and 175?Hz tallied with biophysical modelling. In recording from rat cerebral cortex during somatosensory evoked responses, peak impedance decreases of -0.07???0.006% (mean???SE) with a SNR of >50 could be recorded at 225?Hz. This method provides a reproducible and artefact free means for recording resistance changes during neuronal activity which could form the basis for imaging fast neural activity in the brain.

Resumo Limpo

electr imped tomographi eit recent develop medic imag method potenti produc imag fast neuron depolar brain previous model suggest appli current need hz signaltonois ratio snr record scalp electrod evok respons low permit imag novel method contemporan evok potenti subtract present current appli hz cerebr cortex evok activ although signal smaller dc princip nois eeg reduc result improv snr valid record compound action potenti crab walk leg nerv peak chang hz talli biophys model record rat cerebr cortex somatosensori evok respons peak imped decreas means snr record hz method provid reproduc artefact free mean record resist chang neuron activ form basi imag fast neural activ brain

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