Experimental calibration of x-ray camera performance: spatial resolution, flat field response, and radiation sensitivity

Hongwei Xie; Jinchuan Chen; Linbo Li; Faqiang Zhang; Dingyang Chen

doi:10.1117/12.2072852

11 November 2014 Experimental calibration of x-ray camera performance: spatial resolution, flat field response, and radiation sensitivity

Hongwei Xie, Jinchuan Chen, Linbo Li, Faqiang Zhang, Dingyang Chen

Author Affiliations +

Proceedings Volume 9273, Optoelectronic Imaging and Multimedia Technology III; 92731H (2014) https://doi.org/10.1117/12.2072852
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

Major parameters of X-rays camera include spatial resolution, flat field response and dynamic range. Such parameters were calibrated on a pulsed X-rays source with about 0.3MeV energy. Fluorophotometric method was used for the measurement of spatial resolutions of the penetrating lights and reflecting lights. Results indicated they were both basically same. And the spatial resolution of the camera was measured with edge method. Corresponding to 10% intensity, the modulator transfer function (MTS) of the resolution was about 5lp/mm, while the size of the point spread function (PSF) was about 0.8mm. Due to the system design with both short distance and big filed of view, the flat field non-homogeneity was about 15%. In addition, because of the relatively big gain of the scintillator and MCP image intensifier and the limited detecting efficiency of the X-rays and scintillator, the image intensity of the flat field response demonstrated a big standard deviation of about 1375. Due to the crosstalk throughout the system, the maximal signal-to-noise ratio (SNR) of the X-rays camera was about 10:1.These results could provide important technical specifications for both applications of X-rays camera and data processing of other relevant images.

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Hongwei Xie, Jinchuan Chen, Linbo Li, Faqiang Zhang, and Dingyang Chen "Experimental calibration of x-ray camera performance: spatial resolution, flat field response, and radiation sensitivity", Proc. SPIE 9273, Optoelectronic Imaging and Multimedia Technology III, 92731H (11 November 2014); https://doi.org/10.1117/12.2072852

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KEYWORDS

X-rays

Scintillators

Cameras

X-ray imaging

Spatial resolution

Image intensifiers

Calibration

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