Experimental evaluation of a-Se flat-panel X-ray detector for digital radiography

Author

Kim, Jin-Yung ; Park, Ji-Koon ; Choi, Jang-Yong ; Cha, Byung-Youl ; Kang, Sang-Sik ; An, Sang-Ho ; Nam, Sang-hee ; Choi, Heung-Kook

Author_Institution

Dept. of Biomed. Eng., Inje Univ., Kyungnahm

Volume

7

fYear

2004

fDate

16-22 Oct. 2004

Firstpage

4048

Lastpage

4052

Abstract

In this paper, the evaluation of a selenium-based flat-panel digital X-ray detector is described. The prototype detector has a pixel pitch of 139 mum and a total active imaging area of 14 inches times 8.5 inches, making up a total of 3.9 million pixels. Several quantitative parameters have been devised that correlate with the abilities of imaging devices to perform clinical tasks. The concepts of MTF, NPS, and DQE have been well described and are very useful descriptors of resolution, noise, and signal-to-noise ratio transfer ability. Such parameters (sensitivity, leakage current, MTF, NPS, DQE) were examined to evaluate the performance of this system. The sensitivity of 4.82 nC/mR/cm² was measured at 10 V/mum, while leakage current was measured at 270 pA/cm². The measured MTF at 2 lp/mm was 40%, and the DQE at 1.5 lp/mm was 16%

Keywords

X-ray detection; diagnostic radiography; DQE; MTF; NPS; a-Se flat-panel X-ray detector; active imaging area; clinical tasks; detective quantum efficiency; digital radiography; imaging devices; leakage current; modulation transfer function; noise power spectrum; pixel pitch; prototype detector; signal-to-noise ratio; Biomedical imaging; Biomedical measurements; Diagnostic radiography; Optical imaging; Pixel; Prototypes; Radiation detectors; Thin film transistors; X-ray detection; X-ray detectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2004 IEEE

Conference_Location

Rome

ISSN

1082-3654

Print_ISBN

0-7803-8700-7

Electronic_ISBN

1082-3654

Type

conf

DOI

10.1109/NSSMIC.2004.1466783

Filename

1466783