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Proceedings Paper

Theoretical and Monte Carlo optimization of a stacked three-layer flat-panel x-ray imager for applications in multi-spectral diagnostic medical imaging
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Paper Abstract

We propose a new design of a stacked three-layer flat-panel x-ray detector for dual-energy (DE) imaging. Each layer consists of its own scintillator of individual thickness and an underlying thin-film-transistor-based flat-panel. Three images are obtained simultaneously in the detector during the same x-ray exposure, thereby eliminating any motion artifacts. The detector operation is two-fold: a conventional radiography image can be obtained by combining all three layers’ images, while a DE subtraction image can be obtained from the front and back layers’ images, where the middle layer acts as a mid-filter that helps achieve spectral separation. We proceed to optimize the detector parameters for two sample imaging tasks that could particularly benefit from this new detector by obtaining the best possible signal to noise ratio per root entrance exposure using well-established theoretical models adapted to fit our new design. These results are compared to a conventional DE temporal subtraction detector and a single-shot DE subtraction detector with a copper mid-filter, both of which underwent the same theoretical optimization. The findings are then validated using advanced Monte Carlo simulations for all optimized detector setups. Given the performance expected from initial results and the recent decrease in price for digital x-ray detectors, the simplicity of the three-layer stacked imager approach appears promising to usher in a new generation of multi-spectral digital x-ray diagnostics.

Paper Details

Date Published: 29 March 2016
PDF: 14 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97833Z (29 March 2016);
Show Author Affiliations
Sebastian Lopez Maurino, Univ. of Waterloo (Canada)
Aldo Badano, U.S. Food and Drug Administration (United States)
Ian A. Cunningham, Robarts Research Institute (Canada)
The Univ. of Western Ontario (Canada)
Karim S. Karim, Univ. of Waterloo (Canada)

Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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