【摘要】 介绍了一套完整的用于肺功能监测的电阻抗成像系统。该系统以PC作为主控机,进行可视控制、图像重建等操作;DSP实现电极选通、数据采集并与PC进行数据通信。采用直接数字合成(DDS)技术产生高精度激励信号源,用相敏解调方法实现数据获取。同时进行了在体实验,测量了体位发生变化时,重力作用对肺部气体分布的影响,证明了电阻抗成像系统监测肺部呼吸过程、检查肺部组织病变的可行性。更多还原

【Abstract】 A complete Electrical Impedance Tomography system that can monitor lung function is introduced in this paper. The master PC is responsible for visual control and image reconstruction, while DSP carries out tasks such as electrode selection, data acquisition and data communication with the master. Based on the DDS technique, the exciting signal source has high accuracy, and the data can be acquired by phase-sensibility demodulation. The vivo experiment proves that gravity exerts an effect on the distribution of intrapulmonary ventilation, and shows that the Electrical Impedance Tomography is able to monitor lung circulation and check pathological changes.更多还原