【摘要】 详细论述了高频医学电阻抗断层成像(EIT)系统设计的关键技术,其中包括激励信号源、电压控制电流源、模拟开关阵列以及信号解调等环节。设计了基于数字信号处理器(DSP)的主从式数据采集系统。PC机作为主控机,进行可视控制、图像重建、实时显示等操作;DSP实现电极选通、数据采集并与PC机进行数据通信。该系统具有数据采集速度快、使用灵活、可扩展性强的特点。更多还原

【Abstract】 The key technology of high-frequency medical EIT system is presented in detail, i.e. the signal generator, voltage controlled current source, analog switch array and signal demodulation. A master-slave data acquisition system based on DSP is designed. The master PC is responsible for visual control, image reconstruction and on-time display, while DSP carries out tasks such as electrode selection, data acquisition and data communication with the master. The system possesses the characteristics such as fast response, flexibility and expansibility.更多还原