Stochastic image reconstruction for a dual-particle imaging system

Stochastic image reconstruction has been applied to a dual-particle imaging system used for nuclear safeguards applications. The dual-particle imager (DPI) is a combined Compton-scatter and neutron-scatter camera capable of producing separate neutron and photon images. The stochastic origin ensembles (SOE) method has been chosen for fast image reconstruction times compared to list-mode maximum-likelihood estimation-maximization and because no estimation of system response parameters is required. This work contains SOE image reconstructions for a 252Cf point source, two mixed-oxide (MOX) fuel canisters representing point sources, and the MOX fuel canisters representing a distributed source. Simulation of the DPI using MCNPX-PoliMi is validated by comparison of simulated and measured results. Because the quality of a reconstructed SOE image strongly relies on the number of counts and iterations used, the relationship between these quantities is investigated by examining the convergence of an image over many trials.

HAMEL Michael;  POLACK K;  POITRASSON-RIVIERE Alexis;  FLASKA Marek;  CLARKE Shaun D.;  POZZI Sara;  TOMANIN Alice;  PEERANI Paolo; 

2016-01-12

ELSEVIER SCIENCE BV

JRC96393

0168-9002,   

https://publications.jrc.ec.europa.eu/repository/handle/JRC96393,   

10.1016/j.nima.2015.12.002,