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Proceedings Paper

Quantum efficiency of a digital x-ray imaging system for small animal studies
Author(s): Qiong Wang; Xizeng Wu; Wei R. Chen; John Cheung; Hong Liu
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Paper Abstract

The objective of this study is to characterize the quantum efficiency of a digital x-ray imaging system. This system is designed for small animal experiments. It is equipped with an x-ray tube with a Be-filtered tungsten target, 0.02 mm focal spot and 0.3 mA operating current. The fiber optically coupled CCD module, through a scintillating screen, covers a field of 5 cm 10 cm, at 1024 2048 pixel format. To analyze the impact of x-ray photon flux and CCD electronic noise to the quantum efficiency of the system, the noise power spectrum (NPS) and detective quantum efficiency (DQE) were measured as a function of x-ray exposure and detector integration time. A BR-12 phantom was placed between the x-ray tube and the detector during measurements. The results showed consistent DQE when exposure/integration is in the range of 2 to 7 seconds (for a 0.5cm thick phantom), and 3 to 15 seconds (for a 2cm thick phantom). With a 0.5cm phantom, DQE are approximately 36.7%, 25% and 5.4% at frequencies of 0 lp/mm, 3 lp/mm and 8 lp/mm respectively. With a 2 cm BR-12 slab, hardened x-ray beam at 26 KVp doesn’t have much impact on DQE, approximately 36.2%, 27.3% and 6% for 0 lp/mm, 3 lp/mm and 8 lp/mm frequencies. In summary, the CCD based digital x-ray imaging system investigated in this study is an efficient, x-ray quantum noise limited system for small animal experiments.

Paper Details

Date Published: 1 July 2004
PDF: 5 pages
Proc. SPIE 5318, Advanced Biomedical and Clinical Diagnostic Systems II, (1 July 2004); doi: 10.1117/12.543429
Show Author Affiliations
Qiong Wang, Univ. of Oklahoma (United States)
Xizeng Wu, Univ. of Alabama/Birmingham (United States)
Wei R. Chen, Univ. of Central Oklahoma (United States)
John Cheung, Univ. of Oklahoma (United States)
Hong Liu, Univ. of Oklahoma (United States)

Published in SPIE Proceedings Vol. 5318:
Advanced Biomedical and Clinical Diagnostic Systems II
Gerald E. Cohn; Warren S. Grundfest M.D.; David A. Benaron M.D.; Tuan Vo-Dinh, Editor(s)

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