Design and fabrication of a sandwich detector for material discrimination and contrast cancellation in dual-energy based x-ray imaging

Author:

Alikunju Rimcy Palakkappilly1ORCID,Buchanan Ian1ORCID,Esposito Michela1ORCID,Morehen Jason2ORCID,Khan Asmar2,Stamatis Yiannis2,Iacovou Nicolas2ORCID,Bullard Edward2ORCID,Anaxagoras Thalis2,Brodrick James2ORCID,Olivo Alessandro1ORCID

Affiliation:

1. Department of Medical Physics and Biomedical Engineering, UCL 1 , Malet Place, London WC1E 6BT, United Kingdom

2. ISDI Ltd, Highgate Business Centre 2 , 33 Greenwood Place, London NW5 1LB, United Kingdom

Abstract

Dual-energy imaging represents a versatile and evolving technology with wide-ranging applications in medicine and beyond. Recent technological developments increased the potential for improved diagnostic accuracy and expanded imaging capabilities across various fields. The purpose of this work is to design and develop an energy-integrating multilayer detector, known as a sandwich detector, aimed at single-shot dual-energy imaging tasks such as material discrimination and contrast cancellation. The sandwich detector uses two complementary metal oxide semiconductor advanced pixel sensors of 50 μm pixel size. The top and bottom sensors detect low-energy (LE) and high-energy (HE) photons, with sensors coupled with 250 and 600 μm scintillators, respectively. For better spectral separation between layers without excessively affecting the detected statistic in the bottom layer, the insertion of a 0.25-mm Cu filter between the layers was found to be the optimal choice, from among the tested 0-, 0.25-, and 0.5-mm filter options. The thickness selection for scintillator and intermediate Cu filter was carried out through a dual-energy simulation model. The experiments confirmed the model's reliability in selecting the optimal thicknesses of the intermediate Cu filter, thereby providing reassurance also on the choice of the top scintillator.

Funder

Engineering and Physical Sciences Research Council

Royal Academy of Engineering

Publisher

AIP Publishing

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