Development of a large-area multilayer detector for single-shot dual-energy imaging

We have developed a sandwich-like multilayer detector capable of imaging a large field of view for the purpose of dental computed tomography. Two detectors forming the sandwich detector are based on indirect-conversion flat-panel detector technology. This development employed a relatively thin Gd2O2...

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Bibliographic Details
Published in:Journal of instrumentation 2018-12, Vol.13 (12), p.C12018-C12018
Main Authors: Kim, J., Kim, D.W., Kam, S., Park, J., Shon, C.-S., Heo, S.K., Kim, H.K.
Format: Article
Language:English
Subjects:
Circuit boards
Computed tomography
Energy conversion efficiency
Field of view
Imaging
Metal oxides
Multilayers
Noise
Photodiodes
Power efficiency
Printed circuits
Quantum efficiency
Scintillation counters
Sensors
Signal to noise ratio
Substrates
Transfer functions
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Summary:We have developed a sandwich-like multilayer detector capable of imaging a large field of view for the purpose of dental computed tomography. Two detectors forming the sandwich detector are based on indirect-conversion flat-panel detector technology. This development employed a relatively thin Gd2O2S:Tb scintillator for the front-detector scintillator and a relatively thick CsI:Tl for the rear one. On the other hand, the same photodiode arrays based on complementary metal-oxide-semiconductor active pixel technology were used for both detector layers. While the substrate of the rear flat-panel detector was a conventional printed-circuit board (PCB), the front detector was realized onto a flexible PCB, which is then electrically connected to a separate corresponding PCB placed under the rear detector PCB. Imaging performance of each detector layer in the sandwich detector was evaluated in terms of large-area or zero-frequency signal and noise, modulation-transfer function, noise-power spectrum, and detective quantum efficiency. Compared to previous designs, the current design showed higher signal-to-noise ratio performances for which the scintillators used were mainly responsible. Demonstration dual-energy images obtained for a postmortem mouse supported the quantitative measurements.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/13/12/C12018