一个基于物理模型的生物电阻抗断层成像系统的研究  

Research of the System for Electrical Impedance Tomography Based on Physical Phantom

作　　者：董秀珍[1] 付峰[1] 尤富生[1] 汤孟兴[1] 刘锐岗[1] 史学涛[1] 

机构地区：[1]第四军医大学医学电子工程教研室,陕西西安710032

出　　处：《中国医学物理学杂志》2004年第4期226-229,共4页Chinese Journal of Medical Physics

基　　金：国家自然科学基金资助项目(50337020)

摘　　要：电阻抗断层成像(electricalimpedancetomography,EIT)是以目标体内电阻抗的分布或变化为成像对象的一种新型成像技术。它具有简便、无创、造价较低的优势,并具有功能成像及动态图像监护的优点。我们设计了基于物理模型的EIT系统,该系统由硬件系统和软件系统组成。硬件系统由32电极、物理模型、恒流驱动模块、信号检测模块、数据采集模块、驱动及测量模式设置模块、多组电源模块以及计算机等组成。我们主要在图像重构模式和算法方面进行了研究,实现了等位线反投影动态重构算法法并提出了广义逆动态重构算法。应用该系统在物理模型上得到了较好的结果。Electrical impedance tomography(EIT) is a new method of medical imaging, It has caused lots of interest for its advantages such as non-invasive, no harm, economic, function imaging and clinical image monitoring. EIT technique includes static imaging and dynamic imaging. We have designed an electrical impedance tomography system. This system is composed of a hardware system and a software system. The hardware system is composed of 32 electrodes, a physical phantom, constant current source, hidh accuracy measurment block, driving-mode and measuring-mode setting block, data acquisition block and computer. We mainly focused our research on the reconstruction model and algorithm: completed the Equal Potential Back Projection algorithm in dynamic EIT and proposed a serial new reconstruction algorithms named General Inversion algorithm. We implemented them in computer simulation study and phantom imaging, a better results have been obtained.

关 键 词：电阻抗断层成像 硬件 图像重构 物理模型 

分 类 号：R318.6[医药卫生—生物医学工程]