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A low-cost integrated ERT system based on serial bus and 2 evaluation boards with 8 electrodes is designed and implemented. Tikhonov regularization is adopted for image reconstruction with conductance values measured from the designed system. Test results suggest that the system can produce reliable and repeatable measurements for image reconstructions of multiple objects with the cost lower than...
This paper presents the software and hardware design aspects of the first digital MIT system. Excitation signal generation, receiving signal demodulation and channel multiplexing control are all implemented inside a Xilinx FPGA (Spartan III). The image reconstruction software is written in VC++ and real time images up to 200 frames /second can be achieved for 50 K Hz excitation. Fitted with an 8 coil...
This paper presents a novel method to increase the signal to noise ratio in MIT data acquisition by exploiting transient process analysis. In front-end circuits for inductance measurements in MIT, a critical step is the phase sensitive demodulation, which includes a low pass filter. When the excitation source is switched from one coil to the next, a transient process occurs as the received voltage...
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