Presentation Title

Conventional Rectangular Electrodes vs Circular Electrodes for Electrical Impedance Myography (EIM) Measurement

Location

Room 2903

Session Format

Paper Presentation

Research Area Topic:

Engineering and Material Sciences - Electrical

Co-Presenters, Co- Authors, Co-Researchers, Mentors, or Faculty Advisors

Faculty advisor: Dr Mohammad Ahad

Abstract

Electrical Impedance Myography (EIM) is a four electrode impedance based technique for the evaluation of diseases affecting nerve and muscle in which a high frequency low intensity current is injected through a localized area and the resulting voltage patterns are analysed. EIM approach proves that parameters obtained from these voltage patterns show different results due to neuromuscular diseases or any other abnormalities. However, these parameters also depend on the subcutaneous fat thickness, thickness of muscle and inter electrode distances. The objective of our study is to analyse the effect of different electrode shape over the conventional rectangular shape in order to find out any possible configuration which is less prone to the skin-fat thickness yet able to diagnose the neuromuscular disease. To observe the variation caused by different electrode shapes, a FEM model of human upper arm was developed using COMSOL Multiphysics 4.2a since FEM has established as a proper approach to assess the disease induced alterations of muscles. According to the study conducted on EIM so far, among different electrical entities reactance is the identifying parameter, observation of which can lead us to the accurate result of disease diagnosis. Results obtained based on the simulation show that, percentage change in reactance per millimeter skin-fat thickness is 11.21% for circular shape electrodes whereas it is 17.74% in case of rectangular electrodes. Though reactance variation decreased in circular electrode configuration, the disease detection remains unhampered. The future goal of our study is to design a feasible geometric shape which is less affected by unwanted parameters. In accordance to that, we plan to extend our study by using genetic algorithm to design a convenient electrode shape which can serve the purpose best.

Keywords

Impedance, EIM, Muscle

Presentation Type and Release Option

Presentation (Open Access)

Start Date

4-24-2015 1:30 PM

End Date

4-24-2015 2:30 PM

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Apr 24th, 1:30 PM Apr 24th, 2:30 PM

Conventional Rectangular Electrodes vs Circular Electrodes for Electrical Impedance Myography (EIM) Measurement

Room 2903

Electrical Impedance Myography (EIM) is a four electrode impedance based technique for the evaluation of diseases affecting nerve and muscle in which a high frequency low intensity current is injected through a localized area and the resulting voltage patterns are analysed. EIM approach proves that parameters obtained from these voltage patterns show different results due to neuromuscular diseases or any other abnormalities. However, these parameters also depend on the subcutaneous fat thickness, thickness of muscle and inter electrode distances. The objective of our study is to analyse the effect of different electrode shape over the conventional rectangular shape in order to find out any possible configuration which is less prone to the skin-fat thickness yet able to diagnose the neuromuscular disease. To observe the variation caused by different electrode shapes, a FEM model of human upper arm was developed using COMSOL Multiphysics 4.2a since FEM has established as a proper approach to assess the disease induced alterations of muscles. According to the study conducted on EIM so far, among different electrical entities reactance is the identifying parameter, observation of which can lead us to the accurate result of disease diagnosis. Results obtained based on the simulation show that, percentage change in reactance per millimeter skin-fat thickness is 11.21% for circular shape electrodes whereas it is 17.74% in case of rectangular electrodes. Though reactance variation decreased in circular electrode configuration, the disease detection remains unhampered. The future goal of our study is to design a feasible geometric shape which is less affected by unwanted parameters. In accordance to that, we plan to extend our study by using genetic algorithm to design a convenient electrode shape which can serve the purpose best.