Design of a novel digital phantom for EIT system calibration

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Electrical Engineering

Background:

• Electrical Impedance Tomography (EIT) systems require precise calibration for accurate imaging.
• Existing calibration methods can be time-consuming and lack flexibility.
• Digital phantom technology offers a promising avenue for advanced system calibration.

Purpose of the Study:

• To design and present a novel digital phantom for calibrating Electrical Impedance Tomography (EIT) systems.
• To demonstrate the capability of simulating various tissue impedances using digital techniques.
• To evaluate the performance of the digital phantom for EIT calibration.

Main Methods:

• Hardware implementation utilizing a Field-Programmable Gate Array (FPGA) for core processing.
• Integration of current sensing, voltage generation, and electrode switching circuitry.
• Software implementation of the CORDIC algorithm for Direct Digital Synthesis (DDS) and related algorithms.

Main Results:

• The digital phantom successfully simulated diverse tissue impedances.
• Accurate performance was demonstrated across a frequency range of 10 Hz to 2 MHz.
• The system exhibited high precision in impedance simulation.

Conclusions:

• The developed digital phantom provides a flexible and accurate solution for EIT system calibration.
• FPGA-based digital techniques enhance the speed and precision of the calibration process.
• This novel approach has significant potential to advance EIT system development and application.