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Performance Characteristic of a CsI(Tl) Flat Panel Detector Radiography System  

Jeong, Hoi-Woun (Beakseok Culture University, Department of Radiological Science)
Min, Jung-Hwan (Shingu University, Department of Radiological Technology)
Kim, Jung-Min (Korea University, College of Health Science, Department of Radiological Science)
Park, Min-Seok (Korea Institute of Radiological & Medical Sciences, Research Institute of Radiological & Medical Sciences)
Lee, Gaung-Young (National Institute of Food and Drug Safty Evaluation)
Publication Information
Journal of radiological science and technology / v.35, no.2, 2012 , pp. 109-117 More about this Journal
Abstract
The purpose of this work was to evaluate an amorphous silicon cesium iodide based indirect flat-panel detector (FPD) in terms of their modulation transfer function (MTF), Wiener spectrum (WS, or noise power spectrum, NPS), and detective quantum efficiency (DQE). Measurements were made on flat-panel detector using the International Electrotechnical Commission (IEC) defined RQA3, RQA5, RQA7, and RQA9 radiographic technique. The MTFs of the systems were measured using an edge method. The WS(NPS) of the systems were determined for a range of exposure levels by two-dimensional (2D). Fourier analysis of uniformly exposed radiographs. The DQEs were assessed from the measured MTF, WS(NPS), exposure, and estimated ideal signal-to-noise ratios. Characteristic curve in the RQA3 showed difference in the characteristic curve from RQA5, RQA7, RQA9. MTFs were not differences according to x-ray beam quality. WS(NPS) was reduced with increasing dose, and RQA 3, RQA5, RQA7, RQA9 as the order is reduced. DQE represented the best in the 1mR, RQA 3, RQA5, RQA7, RQA9 decrease in the order. The physical imaging characteristics of FPD may also differ from input beam quality. This study gives an initial motivation that the physical imaging characteristics of FPD is an important issue for the right use of digital radiography system.
Keywords
flat-panel detector; modulation transfer function; Wiener spectrum; noise power spectrum; detective quantum efficiency;
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