Franchois A, Joisel A, Pichot C, Bolomey J C
Laboratoire des Signaux et Systèmes/Service d'Electromagnétisme (CNRS/SUPELEC), Gif-sur-Yvette, France.
IEEE Trans Med Imaging. 1998 Aug;17(4):550-61. doi: 10.1109/42.730400.
This paper presents microwave tomographic reconstructions of the complex permittivity of lossy dielectric objects immersed in water from experimental multiview near-field data obtained with a 2.45-GHz planar active microwave camera. An iterative reconstruction algorithm based on the Levenberg-Marquardt method was used to solve the nonlinear matrix equation which results when applying a moment method to the electric field integral representation. The effects of uncertainties in experimental parameters such as the exterior medium complex permittivity, the imaging system geometry and the incident field at the object location are illustrated by means of reconstructions from synthetic data. It appears that the uncertainties in the incident field have the strongest impact on the reconstructions. A receiver calibration procedure has been implemented and some ways to access to the incident field at the object location have been assessed.
本文展示了利用2.45GHz平面有源微波相机获取的多视图近场实验数据，对浸没在水中的有损介电物体复介电常数进行的微波层析重建。采用基于Levenberg-Marquardt方法的迭代重建算法来求解将矩量法应用于电场积分表示时产生的非线性矩阵方程。通过对合成数据的重建，说明了诸如外部介质复介电常数、成像系统几何形状以及物体位置处的入射场等实验参数不确定性的影响。结果表明，入射场的不确定性对重建的影响最为强烈。已实施了接收器校准程序，并评估了获取物体位置处入射场的一些方法。
