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首页> 外文期刊>International journal of biomedical imaging >Antenna Modeling and Reconstruction Accuracy of Time Domain-Based Image Reconstruction in Microwave Tomography
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Antenna Modeling and Reconstruction Accuracy of Time Domain-Based Image Reconstruction in Microwave Tomography

机译：断层扫描中基于时域的图像重建的天线建模与重建精度

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Nonlinear microwave imaging heavily relies on an accurate numerical electromagneticmodel of the antenna system. The model is used to simulate scatteringdata that is compared to its measured counterpart in order to reconstruct the image. In this paper an antenna system immersed in water is used to image differentcanonical objects in order to investigate the implication of modeling errors on thefinal reconstruction using a time domain-based iterative inverse reconstruction algorithmand three-dimensional FDTD modeling. With the test objects immersedin a background of air and tap water, respectively, we have studied the impact ofantenna modeling errors, errors in the modeling of the background media, and madea comparison with a two-dimensional version of the algorithm. In conclusion evensmall modeling errors in the antennas can significantly alter the reconstructed image. Since the image reconstruction procedure is highly nonlinear general conclusions arevery difficult to make. In our case it means that with the antenna system immersedin water and using our present FDTD-based electromagnetic model the imagingresults are improved if refraining from modeling the water-wall-air interface andinstead just use a homogeneous background of water in the model.
机译：非线性微波成像在很大程度上依赖于天线系统的精确数值电磁模型。该模型用于模拟散射数据，将其与测得的散射数据进行比较，以重建图像。为了研究建模误差对基于时域的迭代逆重构算法和三维FDTD建模的最终重构的影响，采用了浸入水中的天线系统对不同的经典物体成像。将测试对象分别浸入空气和自来水的背景中，我们研究了天线建模误差，背景媒体建模误差的影响，并与该算法的二维版本进行了比较。总之，天线中即使很小的建模误差也可以显着改变重建的图像。由于图像重建过程是高度非线性的，因此很难得出一般结论。在我们的案例中，这意味着将天线系统浸入水中并使用我们目前基于FDTD的电磁模型，如果不对水-壁-空气界面进行建模，而仅在模型中使用均匀的水背景，则成像结果将得到改善。

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