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针对中子散射成像建立了一种快速反投影重建方法,这种方法首先根据每一个散射事件确定粒子可能所在的空间范围,然后该空间范围中进行重建,大大减少了重建的运行时间。应用所建立的方法对模拟的成像数据进行处理,结果表明:重建源与实际源的位向一致,对1000个散射数据进行处理,用时约3 s;对5探测单元成像得到的模拟数据处理,得到重建后点源的位向分辨为8.0°;重建源的位向分辨不随设定重建平面的位置而改变,但重建平面距探测平面越近,重建速度越快;当重建平面达到一定尺寸时,继续增加大重建平面尺寸,重建的运行时间增加不明显,该方法在大视场空间探测成像应用中,具有较高的重建效率。
A fast backprojection method is developed for neutron scattering imaging. This method first determines the possible spatial range of particles according to each scattering event, and then reconstructs the spatial range, which greatly reduces the running time of reconstruction. The proposed method is used to process the simulated imaging data. The results show that the reconstructed source and the actual source have the same orientation, and 1000 scattering data are processed in about 3 s. The simulation data obtained by imaging the 5 detection units are processed, After reconstructing, the orientation of the point source is 8.0 °; the orientation of the reconstruction source does not change with the position of the reconstruction plane, but the reconstruction plane is closer to the detection plane and the reconstruction speed is faster; when the reconstruction plane reaches a certain size , Continue to increase the size of the large reconstruction plane, reconstruction of the running time is not obvious increase, this method in large field of view space exploration imaging applications, with high reconstruction efficiency.