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Low-cost multifrequency electrical impedance-based system (MFEIBS) for clinical imaging: design and performance
Gurmeet Singh1,2, Sneh Anand1,3, Brejesh Lall1
1a Indian Institute of Technology , New Delhi , India.
Journal of Medical Engineering & Technology
|July 19, 2018
Summary
This study presents a low-cost multifrequency electrical impedance-based system (MFEIBS) for clinical imaging. The developed system demonstrates high accuracy and performance, making electrical impedance tomography (EIT) more accessible.
Area of Science:
- Biomedical Engineering
- Medical Imaging Technology
Background:
- Electrical impedance tomography (EIT) is a promising, non-invasive, and cost-effective imaging technique.
- Existing EIT systems can be expensive and complex, limiting widespread clinical adoption.
Purpose of the Study:
- To design and analyze a low-cost multifrequency electrical impedance-based system (MFEIBS).
- To evaluate the performance and accuracy of the MFEIBS for potential clinical applications.
Main Methods:
- Developed an MFEIBS with flexible interfacing for up to 32 electrodes, operating from 1 kHz to 2 MHz.
- Evaluated system performance using indicators like Signal-to-Noise Ratio (SNR), relative error, and Common-Mode Rejection Ratio (CMRR).
- Tested the system with saline phantoms and a 16-electrode plastic phantom for image reconstruction.
Main Results:
- Achieved a mean SNR of 74 dB across the full bandwidth.
- Demonstrated a relative error of less than 0.55% for system accuracy.
- Recorded a maximum CMRR of 85 dB at 1 kHz.
Conclusions:
- The designed MFEIBS is a high-performance, low-cost solution for electrical impedance tomography.
- The system's accuracy and flexibility make it suitable for advancing clinical imaging applications.
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