TY - JOUR
T1 - Bias polarity switching-type TlBr X-Ray imager
AU - Takagi, Katsuyuki
AU - Toyoda, Kohei
AU - Kase, Hiroki
AU - Takagi, Toshiyuki
AU - Tabata, Kento
AU - Terao, Tsuyoshi
AU - Morii, Hisashi
AU - Koike, Akifumi
AU - Aoki, Toru
AU - Nogami, Mitsuhiro
AU - Hitomi, Keitaro
N1 - Funding Information:
Manuscript received January 27, 2021; revised April 9, 2021; accepted April 30, 2021. Date of publication May 10, 2021; date of current version September 16, 2021. This work was supported in part by Japan Agency for Medical Research and Development (AMED) under Grant JP19hm0102034 and in part by the Cooperative Research Projects of Research Center for Biomedical Engineering, Japan.
Publisher Copyright:
© 1963-2012 IEEE.
PY - 2021/9
Y1 - 2021/9
N2 - 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 80μm 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 μm 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.
AB - 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 80μm 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 μm 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.
KW - Semiconductor radiation detector
KW - X-ray imaging
KW - thallium bromide
UR - http://www.scopus.com/inward/record.url?scp=85105871822&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85105871822&partnerID=8YFLogxK
U2 - 10.1109/TNS.2021.3078448
DO - 10.1109/TNS.2021.3078448
M3 - Article
AN - SCOPUS:85105871822
VL - 68
SP - 2435
EP - 2439
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
SN - 0018-9499
IS - 9
ER -