一个感应电流电阻抗断层成像的数据采集系统  

A Data Acquisition System for Induced Current Electrical Impedance Tomography

作　　者：向海燕[1] 董秀珍[1] 秦明新[1] 尤富生[1] 史学涛[1] 付峰[1] 刘锐岗[1] 马建英[1] 

机构地区：[1]第四军医大学生物医学工程系医学电子工程教研室

出　　处：《生物医学工程学杂志》2005年第4期819-823,共5页Journal of Biomedical Engineering

基　　金：中国-以色列科学与战略研究开发专项资金合作研究项目(99M-0021426)

摘　　要：感应电流电阻抗断层成像(ICEIT)是电阻抗断层成像的一个分支。我们设计并实现了一个基于物理模型的32电极高精度ICEIT数据采集硬件系统。提出了一种新的有效抑制电极引线回路中附加感生电动势的方法。通过采用双引线电极和垂直引线技术,使引线回路中的附加感生电动势降低为未采用前的10%,提高了系统的总体精度。对硬件系统的测量结果表明,对测得的数据经1000次叠加后测量精度优于0.5%。采用重建算法对基于物理模型的测量数据进行图像重构,得到了较为理想的成像结果。Induced current electrical impedance tomography（ICEIT） is a new branch of electrical impedance tomography（EIT）. We have designed and set up a high accuracy ICEIT hardware system with 32 electrodes based on physical phantom, and we have brought forward a new method to reduce the additive electromotive force （EMF） in circuit of the electrode leads. By use of the technique of twisted pair wire, the additive EMF in the circuit of the electrode leads has been reduced to 10% of that before use and the precision of the system has been improved, The precision of the final results is better than 0.5% after 1000 measurement data averaged. Applying the reconstructive algorithm,we have obtained preliminary images based on physical phantom.

关 键 词：感应电流 电阻抗断层成像 硬件系统 感生电动势 数据采集系统 测量精度 物理模型 ICEIT 图像重构 测量数据 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]