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Monte Carlo Optical Simulations of a Small FoV Gamma Camera. Effect of Scintillator Thicknesses and Septa Materials

1
Department of Industrial Engineering and Mathematical Sciences (DIISM), Università Politecnica delle Marche, 60131 Ancona, Italy
2
BioEmission Technology Solutions, 11472 Athens, Greece
3
Department of Medical Physics, University of Patras, 26504 Rion, Greece
4
Department of Biomedical Engineering, University of West Attica, 12210 Athens, Greece
5
Department of Materials, Environmental Sciences and Urban Planning (SIMAU), Università Politecnica delle Marche, 60131 Ancona, Italy
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(8), 398; https://doi.org/10.3390/cryst9080398
Received: 28 June 2019 / Revised: 27 July 2019 / Accepted: 29 July 2019 / Published: 1 August 2019
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Abstract

Optical Monte Carlo simulations have been extensively used for the accurate modeling of light transport in scintillators for the improvement of detector designs. In the present work, a GATE Monte Carlo toolkit was used to study the effect of scintillator thicknesses and septa materials in the performance parameters evaluation of a commercially available small animal gamma-optical camera, named “γ-eye”. Firstly, the simulated γ-eye system was validated against experimental data. Then, part of the validated camera was modeled defining all of the optical properties by means of the UNIFIED model of GATE. Different CsI:Na scintillator crystals with varying thicknesses (from 4 mm up to 6 mm) and different reflector (septa) materials were simulated and compared in terms of sensitivity, light output and spatial resolution. Results have demonstrated the reliability of the model and indicate that the thicker crystal array presents higher sensitivity values, but degraded spatial resolution properties. Moreover, the use of black tape around crystals leads to an improvement in spatial resolution values compared to a standard white reflector material. View Full-Text
Keywords: GATE; Monte Carlo simulation; light transport; optical simulation; scintillator crystals GATE; Monte Carlo simulation; light transport; optical simulation; scintillator crystals
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Ricci, R.; Kostou, T.; Chatzipapas, K.; Fysikopoulos, E.; Loudos, G.; Montalto, L.; Scalise, L.; Rinaldi, D.; David, S. Monte Carlo Optical Simulations of a Small FoV Gamma Camera. Effect of Scintillator Thicknesses and Septa Materials. Crystals 2019, 9, 398.

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