Multifrequency electrical impedance tomography system based on undersampling combined with a fast digital...

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Electrical Engineering

Background:

• Multifrequency electrical impedance tomography (MFEIT) offers significant potential in biomedical imaging.
• Accurate acquisition of multifrequency electrical impedance data is crucial for high-performance MFEIT systems.

Purpose of the Study:

• To develop a high-precision MFEIT system for improved multifrequency electrical impedance information acquisition.
• To enhance the accuracy and speed of multifrequency excitation signal demodulation.

Main Methods:

• Implementation of a 16-electrode MFEIT system utilizing semi-parallel acquisition.
• Application of a novel multifrequency digital demodulation algorithm combined with undersampling and fast digital demodulation techniques.

Main Results:

• The proposed undersampling method achieved a demodulation error of less than 0.7% across the 5-500 kHz frequency range.
• The MFEIT system demonstrated a maximum signal-to-noise ratio of 62.92 dB.
• Average performance metrics included a blur radius of 0.953 and a position error percentage of 9.3%.

Conclusions:

• The developed MFEIT system exhibits robust performance and a high signal-to-noise ratio.
• The integration of undersampling and fast digital demodulation significantly improves MFEIT data acquisition accuracy and speed.