Large Field Of Neutron Aperture Imaging Simulation And Image Reconstruction

In the neutron aperture imagery system, the imagery system parameter has decided the imagery quality. Therefore in order to obtain optimized the system parameter, this article embarked from the project application condition using Geant4 has established the pinhole imagery model, as well as the penumbra code imagery model, and has obtained the penumbra code imagery point spread function. Then we have analyzed the difference between the pinhole imagery and the penumbra imagery. Simultaneously we have obtained the projected imaging of the neutron source according to the imagery system. In addition the neutron through the penumbra hole formed code imaging,which need to be decoded. In this article we applied two kind of linear decoding algorithm to get the restored imaging, which is the source distribution. Thus we have confirmed the feasibility of the aperture imagery system.The main research results this article:(1) The design and the establishment to the neutron pinhole and the penumbra imagery model, then we applied the model to simulate the imaging process.(2) The simulation and discussion to the influence of the system point spread function as the spatial distribution changed with the neutron source.(3) Using the linear decoding algorithm (wiener filter, Lucy-Richardson) to restore the code imaging which formed from the neutron source with different shape and different energy distribution.