Bias Polarity Switching-Type TlBr X-Ray Imager
| Autor: | Toru Aoki, Toshiyuki Takagi, Tsuyoshi Terao, Kohei Toyoda, Katsuyuki Takagi, Hisashi Morii, Kento Tabata, Akifumi Koike, Keitaro Hitomi, Hiroki Kase, Mitsuhiro Nogami |
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| Rok vydání: | 2021 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Physics::Instrumentation and Detectors business.industry Attenuation Detector Electron Readout integrated circuit Nuclear Energy and Engineering Sampling (signal processing) Optical transfer function Electrode Optoelectronics Electrical and Electronic Engineering Photonics business |
| Zdroj: | IEEE Transactions on Nuclear Science. 68:2435-2439 |
| ISSN: | 1558-1578 0018-9499 |
| DOI: | 10.1109/tns.2021.3078448 |
| Popis: | This study introduces an X-ray imager that uses TlBr detectors and demonstrates its potential for X-ray imaging applications. Although TlBr detectors are suitable for X-ray imaging applications because of the associated large attenuation coefficients and direct conversion behavior, realizing a flat-panel detector with TlBr involves developing processes. The proposed imager is constructed utilizing a combination of existing technologies; it comprises a plate electrode containing thallium metal to suppress the polarization phenomenon, pixelated silver electrodes with $80~\mu \text{m}$ pitch, and a photon-counting-type readout integrated circuit (ROIC) that can work in the hole as well as electron collection modes. The modulation transfer function (MTF) of the imager is calculated based on the imaging results of an X-ray test chart, and the result corresponds to $180~\mu \text{m}$ sampling. Even though the imager is not designed specifically for TlBr detectors, the measured high-MTF shows the immense potential of TlBr detectors for X-ray imaging applications. In addition, the polarization phenomenon and its recovery effect through bias switching are confirmed to be similar to conventional detectors with large electrodes. The results of this study can motivate the development of flat-panel-detector processes optimized for TlBr detectors. |
| Databáze: | OpenAIRE |
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