Portal de Periódicos da CAPES

Hybrid coded aperture and Compton imaging using an active mask

2009; Elsevier BV; Volume: 608; Issue: 2 Linguagem: Inglês

10.1016/j.nima.2009.06.043

1872-9576

Larry J. Schultz, Mark S. Wallace, M. Galassi, A. Hoover, M. Mocko, D. M. Palmer, Shawn Tornga, R. M. Kippen, M. V. Hynes, Maurice Toolin, Bernard Harris, John McElroy, Daniel Wakeford, Richard C. Lanza, Berthold K. P. Horn, D.K. Wehe,

Nuclear Physics and Applications

The trimodal imager (TMI) images gamma-ray sources from a mobile platform using both coded aperture (CA) and Compton imaging (CI) modalities. In this paper we will discuss development and performance of image reconstruction algorithms for the TMI. In order to develop algorithms in parallel with detector hardware we are using a GEANT4 [J. Allison, K. Amako, J. Apostolakis, H. Araujo, P.A. Dubois, M. Asai, G. Barrand, R. Capra, S. Chauvie, R. Chytracek, G. Cirrone, G. Cooperman, G. Cosmo, G. Cuttone, G. Daquino, et al., IEEE Trans. Nucl. Sci. NS-53 (1) (2006) 270] based simulation package to produce realistic data sets for code development. The simulation code incorporates detailed detector modeling, contributions from natural background radiation, and validation of simulation results against measured data. Maximum likelihood algorithms for both imaging methods are discussed, as well as a hybrid imaging algorithm wherein CA and CI information is fused to generate a higher fidelity reconstruction.