ArticleJournal of medical imaging (Bellingham, Wash.)2018
Photon counting performance of amorphous selenium and its dependence on detector structure.
Article in Journal of medical imaging (Bellingham, Wash.), 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- X-ray and γ-ray Sensing from Aqueous-Based Lead Sulfide Telluride Nanocomposites.Small (Weinheim an der Bergstrasse, Germany) · 2025Article
- Spectral Performance of Multilayer Amorphous Selenium and Selenium-Tellurium Photodetectors.ACS applied optical materials · 2025Article
- Blossoms in perovskite planar X-ray detectors.Nature communications · 2024Article
- Anomalous edge response of cadmium telluride-based photon counting detectors jointly caused by high-flux radiation and inter-pixel communication.Physics in medicine and biology · 2021Article
- Pulse pileup analysis for a double-sided silicon strip detector using variable pulse shapes.IEEE transactions on nuclear science · 2019Article
Corrections and comments
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Authors and funding
3 authors.
Funding
Abstract
Photon counting detectors (PCD) have the potential to improve x-ray imaging; however, they are still hindered by high costs and performance limitations. By using amorphous selenium (a-Se), the cost of PCDs can be significantly reduced compared with modern crystalline semiconductors, and enable large-area deposition. We are developing a direct conversion field-shaping multiwell avalanche detector (SWAD) to overcome the limitation of low carrier mobility and low charge conversion gain in a-Se. SWAD's dual-grid design creates separate nonavalanche interaction (bulk) and avalanche sensing (well) regions, achieving depth-independent avalanche gain. Unipolar time differential (UTD) charge sensing, combined with tunable avalanche gain in the well region allows for fast response and high charge gain. We developed a probability-based numerical simulation to investigate the impact of UTD charge sensing and avalanche gain on the photon counting performance of different a-Se detector configurations. Pulse height spectra (PHS) for 59.5 and 30 keV photons were simulated. We observed excellent agreement between our model and previously published PHS measurements for a planar detector. The energy resolution significantly improved from 33 keV for the planar detector to
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