A Lower Limb Phantom for Simulation and Assessment of Electromyography Technology

Area of Science:

• Biomedical Engineering
• Neuroscience
• Rehabilitation Technology

Background:

• Traditional electromyography (EMG) validation relies on simulations or human subjects lacking ground truth.
• Existing EMG electrodes and systems often lack rigorous validation.
• There is a need for reliable methods to assess EMG hardware and signal processing.

Purpose of the Study:

• To develop a physical limb phantom for validating EMG hardware and signal processing algorithms.
• To create a controllable system for generating ground truth EMG signals.
• To investigate the impact of crosstalk and motion artifacts on EMG recordings.

Main Methods:

• An artificial bone was embedded in conductive gelatin, with embedded wires acting as antennae to broadcast ground truth signals.
• The phantom was used with surface EMG electrodes to simulate muscle crosstalk by varying antenna signal amplitudes.
• Motion artifacts were induced by dropping the phantom, and high-density EMG recorded the effects.

Main Results:

• Varying antenna signal amplitudes demonstrated measurable crosstalk between adjacent EMG electrodes.
• Induced motion artifacts, even small ones, were not fully eliminated by traditional filtering techniques in high-density EMG.
• The phantom successfully simulated realistic conditions for EMG testing.

Conclusions:

• The developed electrical limb phantom serves as a valuable tool for validating EMG systems.
• It allows for controlled testing of muscle crosstalk and motion artifact effects on EMG hardware and software.
• This phantom can advance the reliability and accuracy of EMG-based diagnostics and research.