介绍了由投影重建图像的基本原理，对扇束滤波反投影重建算法进行了分析，并针对该算法的特点提出了一种提高算法求解速度的方法。
In this paper, we propose a new algorithm based on sub-aperture and filtered back-projection algorithm to estimate the anisotropy of objects scattering centers in wide-aperture imaging.
因此提出了改进的偏折层析滤波反投影算法，数值模拟表明，改进算法在有效抑制倾斜现象的同时，对重建结果不会造成明显的失真。
Results show that the effect of projection noise on the reconstructed fields is represented by a slope function related to the filter used in deflection tomographic filtered back-projection algorithm.
在重建过程中，根据探测器的中心偏移量，对滤波线方程、滤波前后的重排和校正以及反投影过程进行修正处理。
In the process of the reconstruction, the filtering line, re-sampling, correction and back-projection are revised respectively according to the detector center excursion.
该算法重建的图像比常用的滤波反投影和代数重建等算法得到的精度高。
The image reconstructed by this algorithm is better in the reconstruction accuracy than that reconstructed by the filtered backprojection and algebraic reconstruction techniques.
为了提高滤波反投影算法图像的重建效率，本文利用参数表的方法对程序作了优化，使重建速度提高了近100倍。
For the sake of the image reconstruction efficiency we shortened the reconstruction time almost 100 times by parameter table method.
为了提高滤波反投影算法图像的重建效率，本文利用参数表的方法对程序作了优化，使重建速度提高了近100倍。
For the sake of the image reconstruction efficiency we shortened the reconstruction time almost 100 times by parameter table method.
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