Current-conveyor-based wide-band current driver for electrical impedance tomography.

Area of Science:

• Electrical Engineering
• Biomedical Engineering
• Medical Imaging

Background:

• Electrical Impedance Tomography (EIT) is a non-invasive imaging technique.
• Accurate current drivers are essential for high-resolution EIT.
• Prostate and breast cancer detection require interrogation at frequencies up to 10 MHz.

Purpose of the Study:

• To develop and characterize a wide-band integrated current driver for EIT.
• To achieve low harmonic distortion and high accuracy for medical imaging applications.
• To enable advanced active electrode functionalities in EIT systems.

Main Methods:

• A current conveyor architecture was employed for the current driver design.
• The driver was fabricated using advanced CMOS 0.18 μm technology.
• Performance was evaluated through harmonic distortion and output impedance measurements.

Main Results:

• The driver delivers 1.2 mA peak-to-peak AC current across 100 Hz-10 MHz.
• Measured harmonic distortion is below [Formula: see text] for frequencies < 100 kHz, rising to [Formula: see text] at 10 MHz.
• High output impedance (101 kΩ at 1 MHz, 19.5 kΩ at 10 MHz) was achieved.

Conclusions:

• The developed current driver is suitable for high-frequency EIT.
• Its performance characteristics support accurate tissue interrogation for cancer detection.
• The integrated design offers potential for miniaturized and efficient EIT systems.