基于全变差-原对偶内点法开放式电阻抗成像  

Open Electrical Impedance Tomography based on Primal Dual-Interior Method with Total Variation Regularization

作　　者：卜世俊[1] 张伟[1] 黄敏[1] 黄文汉 Shijun Bu;Wei Zhang;Min Huang;Wenhan Huang(College of Electronics and Information Engineering,Tongji University,Shanghai,China)

机构地区：[1]同济大学,上海市201804

出　　处：《生物工程前沿（中英文版）》2016年第1期6-10,共5页Biotechnology Frontier

基　　金：受中央高校基本科研业务费专项资金,留学回国人员科研启动基金项目资助(2012)。

摘　　要：多通道电阻抗成像是一种可实现生理体征长期动态监测的低成本技术,常用的封闭式电阻抗成像需将电极均匀分布在被测对象周围,但在实际应用中有一定的局限性,如被测病人因腹部挤压造成腹腔内出血,而无法移动病人在其腹部周围完整均匀地布置电极,以及在临床监护中,病人背部放置电极导致不舒适等缺点。针对此问题,提出一种开放式的测量方式,在被测对象一侧放置电极,并利用全变差-原对偶内点法进行图像重构。仿真结果表明:当目标靠近电极一侧时,开放式与封闭式电阻抗成像均有较好的分辨率和定位准确度;在双目标时,开放式测量依然有很好的分辨率和清晰度。Multi-channel electrical impedance tomography(EIT)is a kind of low cost technique that can be used to dynamically monitor the physiological signals in a long term.We usually need put electrodes around the measured object in closed electrical impedance tomography(CEIT).But this has some limitations in practical applications,such as intraperitoneal hemorrhage caused by abdominal extrusion and sometimes the patients cannot be moved to arrange electrodes around their abdomens evenly.In addition,in the clinical monitoring,it will cause discomfort to put electrodes on patients’back.Aiming at solving this problem,we have put forward a new measure mode called the open electrical impedance tomography(OEIT)where electrodes are only put by one side of the measured object.Resistivity images are reconstructed by the primal dual-interior point method(PDIPM)with total variation regularization.First,we build the models of CEIT and OEIT.Next,we clarify the implementation method of PDIPM algorithms.Finally,we show the reconstructed images by different models.Results show that opened EIT has good resolution and positioning accuracy as well as the closed EIT.

关 键 词：开放式电阻抗成像 全变差 原对偶内点法 开放式测量 

分 类 号：O17[理学—数学]