Developing Current Injection Circuit for Electrical Impedance Tomography

• Published in: Advances in Science and Engineering Technology International Conferences (ASET) (Online) pp. 1 - 9
• Main Authors: Alshehhi, Nayef Abdulla, Almansoori, Abdulrahman Easa, Alshehhi, Hamad Fahad, Alsuwaidi, Yaser Saleh, Alnaqbi, Abdulla Humaid, Abdulkhader, Nabeel Muhamed, Galupa, Nicolae, Kadar, Anas Abdul, Desmal, Abdulla Ali
• Format: Conference Proceeding
• Language: English
• Published: IEEE 03.06.2024
• Subjects: Biomedical imaging; Current Source Circuit; Electrical impedance tomography; Electrodes; Impedance; Integrated circuit reliability; Loading; Multiplexer Circuit; Multiplexing; Operational amplifiers; Robustness; Technical requirements; Testing
• ISSN: 2831-6878
• DOI: 10.1109/ASET60340.2024.10708755

This project aims to design a current injection circuit tailored for electrical impedance tomography (EIT) applications in biomedical imaging. The circuit is intended to inject a safe and low-amplitude current of 1 mA, suitable for both human and animal subjects. Notably, the design utilizes three operational amplifiers, emphasizing the cost-effectiveness of the circuitry. Experimental results demonstrate that the injected current remains stable and insensitive to loading effects up to seven kilo-ohms, which aligns with the intended application requirements. This robustness makes the circuit suitable for its intended purpose. Additionally, this paper delves into the design of the multiplexing circuitry, assuming a two-port injection network configuration, further enhancing the versatility and applicability of the developed system.