Digitalized System Design Of Biological Electrical Impedance Tomography

Characterized by the low cost, small volume , noninvasiveness to human bodies,continuous monitoring and other advantages, the technology of biological electricalimpedance tomography has become a very prosperous non-destructive detectingtechnology ever since its invention.Analogue filter, which is widely adopted in the technology of biological electricalimpedance tomography, has been the bottleneck of imaging speed. Moreover, itscapacity to enhance the speed is limited due to the performances of cut-off frequency.The degree of the precision improvement is limited in the analogue filter andanalogue demodulation, which are interfered with the limitation of the intrinsicprecision and performances of the card of circuit board as well as many other factors.Aimed at solving the above-mentioned problems in the biological electricimpedance tomography, the author brings forward the study on the digitalized systemof the biological electric impedance tomography technology. The main research workand achievements are presented as follows:1. The digitalized hardware system of biological electric impedance tomographytechnology is designed and achieved on the basis of the former system, whichhereinto has been innovated.2. The designed system is based on the collaboration of DSP and FPGA toprovide space for the future upgrading of hardwares.3. It designs the digital filting, FIFO and digital demodulating algorithm on thebasis of the Cyclone chip, and the corresponding algorithm compilation and emulationare also conducted.4. It furthers the study on algorithm of digital filting, compares the nowadaysprevalent fully parallel algorithm and distributed algorithm, and makes elaborateemulation based on Testbench, which is compiled with many methods. The result ofemulation proves that the algorithm has been of good effect.Finally some suggestions to further improve the system are presented by theauthor.