面向肺功能检测的便携式电阻抗成像系统开发

Development of Portable Electrical Impedance Tomography System for Pulmonary Function Detection

为解决现有肺部监测系统基本依赖于PC平台而造成的使用场合受限问题,开发一种面向肺功能检测的便携式电阻抗成像系统。进行系统硬件和软件设计,并介绍成像算法。通过标定板进行性能分析,结果表明:通道一致性和重复性较好,整体的信噪比在60 dB左右。进行单目标和双目标的水槽实验,计算得到其图像误差最小分别为1.10和1.00,图像相关系数最大分别为0.86和0.84。进行人体肺呼吸成像实验,清晰地反映出人体呼吸过程中肺部的面积变化,实现了动态成像的功能。

A portable electrical impedance tomography system for pulmonary function detection is developed to solve the limited use occasions of the existing lung monitoring system due to its dependence on PC platform. The hardware and software of the system are designed with the introduction of imaging algorithm. The performance of the system is analyzed by calibration board. The results show that the channel consistency and repeatability are good, and the overall signal-to-noise ratio is about 60 dB. Single and double target flume experiments are conducted with the minimum image error as 1.10 and 1.00 respectively, and the maximum image correlation coefficient as 0. 86 and 0. 84 respectively. The results of human lung respiration imaging experiment clearly reflect the changes of pulmonary area in the process of human breathing, which realizes the function of dynamic imaging.