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A Monolithic Amorphous-Selenium/CMOS Single-Photon-Counting X-Ray Detector by Abdallah El-Falou; Ahmet Camlica; Reza Mohammadi; Peter M. Levine; Karim S. Karim is a Engineering article available to read on EtoBox.
What is A Monolithic Amorphous-Selenium/CMOS Single-Photon-Counting X-Ray Detector about?
We report on the design and characterization of a monolithic single-photon-counting (SPC) X-ray detector integrating an amorphous semiconductor sensor. Our prototype combines amorphous selenium (a-Se), a well-known photoconductor, with a CMOS readout integrated circuit (ROIC) containing two 26 × 196 arrays of single-energy-threshold pixels. We achieve high spatial resolution for capturing single 60-keV photons by implementing 11.4-μm-pitch pixels and by integrating a 70-μm-thick a-Se sensor on the ROIC. We present experimental SPC results using a mono-energetic 60-keV radioactive source. Our results also suggest that our prototype a-Se/CMOS detector leverages the small-pixel effect (SPE) due to the large ratio of a-Se thickness to pixel pitch. This effect could overcome the slow inherent transient response of a-Se for high count rate X-ray diagnostic applications like mammography.Index Terms-Amorphous selenium (a-Se), CMOS X-ray detector, single-photon-counting (SPC) imager, small-pixel effect (SPE). I. INTRODUCTION L ARGE-AREA digital X-ray detectors are rapidly replac- ing X-ray film screen and computed radiography systems because of their better imaging performance and more effi
Who reads A Monolithic Amorphous-Selenium/CMOS Single-Photon-Counting X-Ray Detector?
It is typically read by researchers, students, and practitioners in Engineering.
- Author
- Abdallah El-Falou; Ahmet Camlica; Reza Mohammadi; Peter M. Levine; Karim S. Karim
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Published
- 2021
- Field
- Engineering (Physical Sciences)