关键词: 电阻抗断层成像;物理模型;静态重构算法

    摘 要:目的 研究基于物理模型的静态电阻抗断层成像技术. 方法 使用电阻抗断层成像激励和测量系统Ⅲ获得物理模型上的测量数据，应用正则化校正的Newton-Raphson算法重构静态阻抗图像. 结果 对几种具有不同电阻率的背景溶液和琼脂目标得到了初步的静态阻抗图像.背景溶液重构图像的灰度比较均匀，重构数值集中在一个较小的范围内，且与实际电阻率数值近似成比例关系;目标重构图像清晰，图像大小与实际大小接近，定位基本准确，不同电阻率的目标在重构图像中具有不同的数值和灰度，对多个目标可以明确区分;驱动电流的大小对重构结果的影响很小. 结论 EIT激励和测量系统Ⅲ所得测量数据的精度基本能满足静态成像的要求，正则化校正的重构算法能够有效区分不同电阻率值的目标，能够适应静态阻抗重构的需要.

    Primary images of static electrical impedance to┐mography based on physical phantom

    LIU Rui-Gang，DONG Xiu-Zhen，QIN Ming-Xin，YOU Fu-Sheng，SHI Xue-Tao，FU Feng，TANG Meng-Xing

    Department of Medical Electronic Engineering，Fac-ulty of Biomedical Engineering，Fourth Military Medical University，Xi'an710033，China

    Keywords:electrical impedance tomography;physical phan-tom;static reconstructed algorithm

    Abstract:AIM To study static electrical impedance tomog-raphy(EIT)technology based on physical phantom.METH┐ODS Measurement data were obtained from the electrical impedance tomography driving&measuring systemⅢ.The static impedance images were reconstructed using the regular-ized Newton-Raphson algorithm.RESULTS For several kinds of background solution and agar objects with different resistivity ......