中文说明：fbp算法实现CT重建，包括不同投影个数、探测器个数和噪声对重建后图像的质量的影响。
English Description：
FBP algorithm is used to realize CT reconstruction, including the influence of different projection number, detector number and noise on the quality of reconstructed image.
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中文说明：fbp算法实现CT重建，包括不同投影个数、探测器个数和噪声对重建后图像的质量的影响。
English Description：
FBP algorithm is used to realize CT reconstruction, including the influence of different projection number, detector number and noise on the quality of reconstructed image.