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动态电阻抗
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  dynamic electrical impedance
     The Selection of Tikhonov Regularization Parameter in Dynamic Electrical Impedance Imaging
     动态电阻抗成像中Tikhonov正则化参数的选择
短句来源
     An Improved Back-projection Algorithm of Dynamic Electrical Impedance Tomography
     一种改进的动态电阻抗断层成像反投影算法
短句来源
     A PRACTICAL RECONSTRUCTION ALGORITHM OF DYNAMIC ELECTRICAL IMPEDANCE TOMOGRAPHY
     一种实用的动态电阻抗断层成象算法
短句来源
     Simulation research on dynamic electrical impedance tomography algorithm based on back-projection technique
     动态电阻抗断层成像反投影算法的仿真研究
短句来源
     As the fundamental research of applying the technology to the cerebral hemorrhage real time monitoring,we simulate the change process of cerebral hemorrhage based on the technology of dynamic electrical impedance tomography.
     作为该技术应用于颅内出血实时监测的基础研究,本研究利用等位线反投影算法,仿真了动态电阻抗断层成像技术应用于颅内出血疾病实时监测过程。
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  “动态电阻抗”译为未确定词的双语例句
     Implementing A Relatively Rigorous Algorithm of Dynamic EIT Problem on The Modified FEM Model
     在改进的有限元模型上实现一种较严格的动态电阻抗断层成象算法
短句来源
     In the study on dynamic EIT, The theory of the equi-potential back-projection algorithm was described based on the principle of X-CT. The algorithm was studied from the aspects of sensitivity, current injection modality, number of electrodes, number of elements of FEM model, anti-noise, and so on. A good formula to calculate theweight coefficient W was brought up.
     在动态电阻抗成像技术研究中,从X-CT的基本原理阐述了等位线反投影算法的原理,并从灵敏度、注入电流方式、电极数、模型单元数、抗噪声等方面对等位线反投影算法进行了系统深入的研究,给出一种性能相对较优的权系数W的计算公式。
短句来源
     AIM To study the property of the algorithm of dynamic induced current electrical impedance tomography Newton iteration method and its dependency on independent measurement.
     目的 在仿真模型的基础上 ,研究一种用感应电流激励的动态电阻抗断层成像算法—牛顿迭代法的特性及其对独立测量数的依赖性 .
短句来源
     The special targets of human meridian dynamic impedance such as testing precision, anti-jamming, low noise and so on are studied. Based on the analysis of the key parts —— the noise source of sampling amplification circuits and noise generative mechanism, which affect the human meridian electronic testing system, measures of depressing noise design and raising testing precision are discussed in detail. The key parameters in circuits are given by means of orthogonal test.
     根据人体经络动态电阻抗的检测精度、抗干扰、低噪声等特殊指标的要求,对影响经络特性电子检测系统中的关键部分,取样放大电路的噪声源、噪声产生机理进行了分析,提出了降低噪声设计、提高检测精度的措施和方法,确定了电路中的关键元器件的参数,在实际应用中达到了预期效果。
短句来源
  相似匹配句对
     Dynamic news
     动态
短句来源
     Dynamic State
     动态
短句来源
     Regularized Reconstruction in Dynamic Electrical Impedance Tomography
     动态电阻抗图象重建的正则化方法
短句来源
     Algorithm of dynamic induced current electrical impedance tomography based on simulation phantom
     动态感应电流电阻抗断层成像的算法仿真
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A dynamic electrical impedance tomography (EIT) simulation system is presented here. The system has functions as the following: establishing the finite elements mesh model simulating the human body, implementing the numerical computation of the electrical field, and implementing two image reconstruction algorithm based on the back-projection technique. Some preliminary results are abtained. It is found that the algorithm based on back-projection has advantages of precise locating, high speed despite of some...

A dynamic electrical impedance tomography (EIT) simulation system is presented here. The system has functions as the following: establishing the finite elements mesh model simulating the human body, implementing the numerical computation of the electrical field, and implementing two image reconstruction algorithm based on the back-projection technique. Some preliminary results are abtained. It is found that the algorithm based on back-projection has advantages of precise locating, high speed despite of some reconstruction errors. Finally, the method of improvement is discussed.

在计算机上建立了动态电阻抗断层成像(EIT)仿真系统,其中包括:建立模仿人体躯干的计算机有限元模型,实现模型的电场数值计算,并实现了以反投影技术为基础的两种动态图像重建算法.得到的初步的成像结果表明:反投影法对目标定位准确,速度快.但对于目标在远离电极的位置,重构误差相对大,且对噪声敏感.最后讨论了对算法的改进.

AIM To study the property of the algorithm of dynamic induced current electrical impedance tomography Newton iteration method and its dependency on independent measurement. METHODS FEM method was used to discretize the imaging area, and then Newton iteration method was used to solve the problem and reconstruct images with different numbers of coils for comparision. RESULTS With different coils, different images were obtained. The results indicated that Newton iteration method could be used to locate the...

AIM To study the property of the algorithm of dynamic induced current electrical impedance tomography Newton iteration method and its dependency on independent measurement. METHODS FEM method was used to discretize the imaging area, and then Newton iteration method was used to solve the problem and reconstruct images with different numbers of coils for comparision. RESULTS With different coils, different images were obtained. The results indicated that Newton iteration method could be used to locate the conductivity perturbation accurately, and that when the number of independent measurement increased, the imaging error would decrease. CONCLUSION Newton iteration method is a feasible method for the inverse problem of dynamic induced current electrical impedance tomography. But, when the number of independent measurement is less than the number of FEM element, the iterative process will not converge accurately at the practical conductivity and the result is just an approximate. When the number of independent measurements is larger than the number of FEM element, the iterative process can converge accurately at the practical conductivity, by which high quality images will be obtained.

目的 在仿真模型的基础上 ,研究一种用感应电流激励的动态电阻抗断层成像算法—牛顿迭代法的特性及其对独立测量数的依赖性 .方法 利用有限元法对成像区域进行离散 ,然后再用牛顿迭代法针对不同的线圈数进行求解、成像 ,以资比较 .结果 对同一目标 ,分别就不同的线圈数得到了成像结果 ,表明牛顿迭代法对电导率扰动的定位是基本准确的 ,成像误差随线圈数的增加而减小 .结论 用牛顿迭代法解动态感应电流电阻抗断层成像的逆问题是可行的 ,但在独立测量数小于剖分单元数的情况下 ,迭代过程不会准确的收敛于实际的电导率分布 ,而是一种近似 ;在独立测量数大于剖分单元数的情况下 ,迭代过程可以收敛于实际的电导率分布 ,从而得到高质量的重构图像

Dynamic electrical impedance imaging is a non linear inverse problem which is always discretized by finite element method and solved by linear model. Since the coefficient matrix of the linear model is ill conditioned, the regularization method is used to get stable solution. However Tikhonov regularization is easy to realize, the selection of the regularization parameter is bothering. In this paper, according to the results of a great number of experiments, a new method for determining the regularization...

Dynamic electrical impedance imaging is a non linear inverse problem which is always discretized by finite element method and solved by linear model. Since the coefficient matrix of the linear model is ill conditioned, the regularization method is used to get stable solution. However Tikhonov regularization is easy to realize, the selection of the regularization parameter is bothering. In this paper, according to the results of a great number of experiments, a new method for determining the regularization parameter is presented which uses the characteristic of the product of the norm of the error and the regularization solution. The reconstructed image using the regularization parameter selected by the proposed method has good spatial resolution.

动态电阻抗成像是一个非线性逆问题 ,在通过有限元法离散化为线性问题求解时 ,由于系数矩阵的病态性 ,需要正则化处理才能得到稳定解。 Tikhonov方法因为易于实现而应用广泛 ,但在用 Tikhonov方法正则化时涉及到正则化参数的选择 ,它对重构图像的质量影响很大 ,至今还没有通用的方法确定。本研究在大量试验的基础上 ,提出一种新的选择正则化参数的方法 ,充分利用了重构图像的误差的范数与正则化解的范数的乘积的变化规律 ,所得的重构图像具有较好的空间分辨率

 
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