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4 April 2022 Energy resolution of amorphous selenium detectors: conventional vs unipolar charge sensing
Ahmet Camlica, Denny Lee, Hyunsuk Jang, M. Zahangir Kabir, Karim Karim
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Proceedings Volume PC12031, Medical Imaging 2022: Physics of Medical Imaging; PC120310G (2022) https://doi.org/10.1117/12.2613030
Event: SPIE Medical Imaging, 2022, San Diego, California, United States
Abstract
In this study, we fabricated a pixelated unipolar charge sensing detector based on amorphous selenium with a 20-μm pixel pitch using standard lithography process. A pulse-height spectroscopy (PHS) setup with a very low noise front-end electronics was designed, and experiments were performed to investigate the achievable energy resolution with the unipolar detector, as well as with a conventional detector for comparison purposes. PHS measurement results are presented that demonstrate, for the first time, a measured energy resolution of 8.3 keV at 59.5 keV is for the unipolar charge sensing device in contrast to 14.5 keV at 59.5 keV for conventional a-Se devices, indicating its promise for the contrast-enhanced photon counting imaging with an unsurpassed spatial resolution.
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Ahmet Camlica, Denny Lee, Hyunsuk Jang, M. Zahangir Kabir, and Karim Karim "Energy resolution of amorphous selenium detectors: conventional vs unipolar charge sensing", Proc. SPIE PC12031, Medical Imaging 2022: Physics of Medical Imaging, PC120310G (4 April 2022); https://doi.org/10.1117/12.2613030
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KEYWORDS
Sensors
Selenium
Electric field sensors
Photon counting
Spatial resolution
Single photon
Spectroscopes
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