电阻抗成像系统中采样信号电路的设计与实验验证  

Design and Experimental Verification of Sampling Signal Circuit in Electrical Impedance Imaging System

作　　者：徐成喜 XU Chengxi(Suzhou Jiantong Medical Technology Co.,Ltd.,Kunshan 200050,China)

机构地区：[1]苏州健通医疗科技有限公司,江苏昆山200050

出　　处：《机械制造与自动化》2024年第3期25-31,共7页Machine Building & Automation

基　　金：中央引导地方科技发展资金项目(236Z7731G)。

摘　　要：深入探讨了电阻抗成像(EIT)中的一个关键技术——采样信号电子电路的实现。详细阐述了电路的基本原理和技术要求,采用先进的电路设计理念和技术,基于高性能的FPGA双驱动系统设计一套肺通气可视化电阻抗成像设备的硬件电路,主要包括采样控制单元、压控恒流源模块、分时复用模块、差分放大电路和安全耐压隔离模块单元。讨论了采用控制单元和分时复用模块实现信号采集的方法。通过实验测试,验证了所设计的EIT硬件电路在信号采集过程中具有高精度和高稳定性的优点,能够满足临床肺通气成像的需求。This study delves into a key technology of electrical impedance tomography(EIT)-the implementation of signal sampling electronic circuit.The basic principles and technical requirements of the circuit are elaborated in detail,and advanced circuit design concepts and techniques are adopted to design a set of hardware circuits for lung ventilation visualization electrical impedance imaging equipment based on a high-performance FPGA dual-drive system,which mainly includes a sampling control unit,a voltage-controlled constant-current source module,a time-multiplexing module,differential amplification circuits and a safe voltage-tolerant isolation module unit.The method of signal acquisition using the control unit and time division multiplexing module is also discussed.And the experimental tests verify that the designed EIT hardware circuit is of high precision and good stability in signal acquisition process,and can meet the needs of clinical lung ventilation imaging.

关 键 词：电阻抗成像 信号采样 EIT硬件电路 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]