Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE
AbstractThe energy-dependence of the neutron cross section provides vastly different contrast mechanisms than polychromatic neutron radiography if neutron energies can be selected for imaging applications. In recent years, energy-resolved neutron imaging (ERNI) with epi-thermal neutrons, utilizing neutron absorption resonances for contrast as well as for quantitative density measurements, was pioneered at the Flight Path 5 beam line at LANSCE and continues to be refined. Here we present event centroiding, i.e., the determination of the center-of-gravity of a detection event on an imaging detector to allow sub-pixel spatial resolution and apply it to the many frames collected for energy-resolved neutron imaging at a pulsed neutron source. While event centroiding was demonstrated at thermal neutron sources, it has not been applied to energy-resolved neutron imaging, where the energy resolution requires to be preserved, and we present a quantification of the possible resolution as a function of neutron energy. For the 55 μm pixel size of the detector used for this study, we found a resolution improvement from ~80 μm to ~22 μm using pixel centroiding while fully preserving the energy resolution. View Full-Text
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Borges, N.P.; Losko, A.S.; Vogel, S.C. Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE. J. Imaging 2018, 4, 40.
Borges NP, Losko AS, Vogel SC. Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE. Journal of Imaging. 2018; 4(2):40.Chicago/Turabian Style
Borges, Nicholas P.; Losko, Adrian S.; Vogel, Sven C. 2018. "Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE." J. Imaging 4, no. 2: 40.