Development and evaluation of a digital radiographic system based on CMOS image sensor

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A cost-effective digital radiographic system with a large field-of-view (FOV) of 17 " x 17 " has been developed. The cascaded imaging system mainly consists of three parts: 1) a phosphor screen to convert incident X-rays into visible photons; 2) a matrix of 8 x 8 array of lens assembly to efficiently collect visible photons emitted by the phosphor screen; and 3) 8 x 8 complementary metal-oxide-semiconductor (CMOS) image sensors, aligned to the corresponding lens assembly. Although low in cost due to economical CMOS image sensors, the overall performance features are comparable with other commercial digital radiographic systems. From the analysis of signal and noise propagation, the system is not an "X-ray quantum-limited" system, rather the system has secondary quantum sink at the light collecting stage. The system resolution is about 2 line pairs per millimeter from both of measured from X-ray images of a line-pair test pattern and the calculation of the modulation-transfer function. Detailed experimental and theoretical analysis of performance will be discussed.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2001-06
Language
English
Article Type
Article; Proceedings Paper
Keywords

EFFICIENCY; DETECTOR

Citation

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, v.48, no.3, pp.666 - 2

ISSN
0018-9499
URI
http://hdl.handle.net/10203/2935
Appears in Collection
NE-Journal Papers(저널논문)
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