Clinical Neurophysiology Evoked Potentials PDF
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Universitätsklinikum des Saarlandes
Karsten Schwerdtfeger
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Summary
This document covers evoked potentials in clinical neurophysiology, discussing signal-to-noise ratio (SNR) and typical SNRs for different neurophysiological recordings. It details technical and biological noise sources and their impact on recordings.
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Clinical Neurophysiology Part V Evoked Potentials Karsten Schwerdtfeger Klinik für Neurochirurgie, Universitätsklinikum des Saarlandes. Studiengang: Neural Engineering Master WS 2024/2025 Technical notes...
Clinical Neurophysiology Part V Evoked Potentials Karsten Schwerdtfeger Klinik für Neurochirurgie, Universitätsklinikum des Saarlandes. Studiengang: Neural Engineering Master WS 2024/2025 Technical notes Signal-to-noise ratio SNR = Psignal/Pnoise Noise Technical noise Line frequency (50/60Hz) 100 Hz noise from electronic devices Amplifier Electrode Operating room: high frequency coagulators Biological noise Depends what we want to record Meaningful versus Unmeaningful signals Technical notes Typical SNRs ENG CMAP >100:1 Sensory potentials 1:2 – 10:1 EMG Spontaneous activity 5:1 -10:1 MUPs > 100:1 Interference pattern > 100:1 EEG Normal subject 10:1 – 50:1 With EMG – artefacts < 1:10 Electrocerebral silence 3:1 Evoked Potentials SEP/VEP 1:2 – 1:20 FAEP
