2014-04-24The data acquisition system (DAS) developed aims to get the 3D breast cancer tomography with 8 current injection channels and 117 voltage measurement channels, capable of generating and measuring voltages and currents. By adopting special electrode and careful circuit layout, the initial bandwidth without calibration can reach 5 MHz. Electrical test results show that the system has a SNR greater than 67dB at 5MHz without digital enhancement method.
2014-04-24With electrical impedance tomography (EIT) system’s development, more electrodes is required to get better detection performance. In this paper, we proposed a circuit design to switch channels to different electrodes quickly and stably.