文献类型：期刊文献

中文题名：电磁层析成像灵敏度矩阵实验测试方法

英文题名：Experimental measurement method of sensitivity matrix for electromagnetic tomography

作者：刘泽[1];薛芳其[1];杨国银[1];邢哲[1];孙秀芳[2]

第一作者：刘泽

通讯作者：Liu, Z.

机构：[1]北京交通大学电子信息工程学院,北京100044;[2]2北京联合大学机电学院,北京100020

第一机构：北京交通大学电子信息工程学院,北京100044

年份：2013

卷号：34

期号：9

起止页码：1982-1988

中文期刊名：仪器仪表学报

外文期刊名：Chinese Journal of Scientific Instrument

收录：CSTPCD;;EI(收录号：20134316894114);Scopus(收录号：2-s2.0-84885921106);北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家自然基金(61227002,61050001);基本科研业务费专项资金(2011JBM007);教育部留学回国人员第41批科研基金(W11C300010);北京市属高等学校人才强教计划(PHR201108415)资助项目

语种：中文

中文关键词：电磁层析成像;灵敏度矩阵;图像重建;正问题;电磁场有限元法

外文关键词：electromagnetic tomography （EMT） ; sensitivity matrix ; image reconstruction ; forward problem ; electro-magnetic finite element method

摘要：灵敏度矩阵是电磁层析成像系统图像重建的先验信息,它反映了电磁层析成像系统在重建截面内微小测试单元逐个放入扰动物质后检测输出值的变化。为实现较为精细的图像重建效果,通常将截面剖分成数量较多的微小单元,用于灵敏度计算和重建结果表达,所以电磁层析成像灵敏度矩阵一般依靠电磁场有限元仿真计算正问题的方法获得。但有限元仿真的正问题模型难以与实际模型完全一致,导致图像重建的先验信息不准,从而影响重建效果。区别于传统研究方法,设计了灵敏度矩阵的实验测试方法,应用精密电动平移台驱动测试试样,使试样按照有限元软件对截面剖分的单元坐标自动逐个测试,最后应用测试结果合成重建所需灵敏度矩阵,图像重建结果证明了该方法的有效性。
Sensitivity matrix is the prior information of image reconstruction in electromagnetic tomography system, which indicates the output variation of detectors when the small test objects are placed one by one in the reconstruction section of the electromabnetic tomography imaging system. In order to get higher image reconstruction quality, the recon- struction section is usually divided into a large number of mesh elements for sensitivity calculation and reconstruction result expression ;therefore the sensitivity matrix of electromagnetic tomography is commonly calculated by solving the forward problem with electromagnetic field finite element simulation method. Nevertheless, the finite element simulation forward problem model is hardly consistent with the real model. This difficulty affects the precision of prior information and the quality of image reconstruction. Different from traditional sensitivity acquisition method, this paper designs an experimental measurement method of the sensitivity matrix. The sensitivity data are measured automatically on each ele- ment by using a precision step motor driven moving stage to move the test object according the coordinate of the mesh obtained from the finite element software. Then, the sensitivity matrix is calculated from the automatically measured re- suits. The image reconstruction results verify the effectiveness of this sensitivity measurement method.