Design And Manufacture Of Flexible Electrical Tomography System

The CT technology which commonly used nowadays is an important means of medical diagnosis and treatment process. Through the CT technology we can obtain image information of patients with lesions, which provide the main basis for the further treatment. However the CT technology is invasive, hysteresis and expensive,which is unable to solve the problem of real-time monitoring. Electrical Tomography System is a new generation technology in the field of medical imaging, can solve limitations of CT technology. The hardware system introduced by this paper is used on human body chest imaging. The main work and innovation points of this paper are as follows.The design requirements have been concluded through Comsol-Matlab joint simulation. And a flexible simulation model which may provide much convenience for later researchers has been developed during the simulation process.The system designed by this paper is a parallel system, it consists of a main control card, some excitation & acquisition cards and a backboard. The main control card implements communication between FPGA and PC via USB protocol. It transfers data collect by excitation & acquisition cards to the PC, and receives control information from the PC. Part of the control information is used to complete the control of the main control card, part is sent to every excitation & acquisition card to complete the control of these cards. One excitation & acquisition card is shared by two electrodes. This modular design method makes the system can adapt to any number of electrodes.Some important modules are described in detail. As of now, some modules of thisSome important modules are described in detail. As of now, some modules of this system have been designed, simulated and made. These modules include: 1) Design the analog conditioning circuit, FPGA related circuit and other auxiliary circuits of the system; 2) Complete the PCB layout of main control card with Cadence company's Allegro software; 3) Write the FPGA internal control procedures and the signal processing program with Verilog HDL, complete the simulation with Modelsim; 4)Write the C program used for communication between FPGA and PC with the USB chip CY68013 A.