A fast back-projection reconstruction method for fast neutron scatter imaging
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摘要: 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。Abstract: A fast back-projection method is established. This method does not need to search all image space, but just to check and search the pixels inside the scope determined by scatter events. So the computational speed of image reconstruction is greatly improved. This method is applied to data from a simulation prototype of a neutron scatter camera with five detector elements. The results show that the reconstruction result is the same as the true point source at azimuth, and it takes only 3 seconds to process 1000 scatter events by this method, the angular resolution of reconstruction result is 8.0. The influence of the reconstruction parameters on runtime and resolution was analyzed,and the conclusion indicates that this method is of advantage to reconstruction the distribution of neutron sourcefor neutron detection in large field of view.
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