Image responses to x-ray radiation in ICCD camera

Jiming Ma; Baojun Duan; Yan Song; Guzhou Song; Changcai Han; Ming Zhou; Jiye Du; Qunshu Wang; Jianqi Zhang

doi:10.1117/12.2033124

21 August 2013 Image responses to x-ray radiation in ICCD camera

Jiming Ma, Baojun Duan, Yan Song, Guzhou Song, Changcai Han, Ming Zhou, Jiye Du, Qunshu Wang, Jianqi Zhang

Proceedings Volume 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications; 890816 (2013) https://doi.org/10.1117/12.2033124
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

When used in digital radiography, ICCD camera will be inevitably irradiated by x-ray and the output image will degrade. In this research, we separated ICCD camera into two optical-electric parts, CCD camera and MCP image intensifier, and irradiated them respectively on Co-60 gamma ray source and pulsed x-ray source. By changing time association between radiation and the shutter of CCD camera, the state of power supply of MCP image intensifier, significant differences have been observed in output images. A further analysis has revealed the influence of the CCD chip, readout circuit in CCD camera, and the photocathode, microchannel plate and fluorescent screen in MCP image intensifier on image quality of an irradiated ICCD camera. The study demonstrated that compared with other parts, irradiation response of readout circuit is very slight and in most cases negligible. The interaction of x-ray with CCD chip usually behaves as bright spots or rough background in output images, which depends on x-ray doses. As to the MCP image intensifier, photocathode and microchannel plate are the two main steps that degrade output images. When being irradiated by x-ray, microchannel plate in MCP image intensifier tends to contribute a bright background in output images. Background caused by the photocathode looks more bright and fluctuant. Image responses of fluorescent screen in MCP image intensifier in ICCD camera and that of a coupling fiber bundle are also evaluated in this presentation.

Citation Download Citation

Jiming Ma, Baojun Duan, Yan Song, Guzhou Song, Changcai Han, Ming Zhou, Jiye Du, Qunshu Wang, and Jianqi Zhang "Image responses to x-ray radiation in ICCD camera", Proc. SPIE 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications, 890816 (21 August 2013); https://doi.org/10.1117/12.2033124

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KEYWORDS

Image intensifiers

CCD cameras

Microchannel plates

Cameras

X-rays

X-ray imaging

Gamma radiation

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