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http://dx.doi.org/10.17946/JRST.2015.38.4.05

Measurement of Image Quality According to the Time of Computed Radiography System  

Son, Soon-Yong (Department of Radiology, Asan Medical Center)
Choi, Kwan-Woo (Department of Radiology, Asan Medical Center)
Kim, Jung-Min (Department of College of Health Science, Radiologic Science, Korea University)
Jeong, Hoi-Woun (Department of Radiological Technology, Baekseok Culture University)
Kwon, Kyung-Tae (Department of Radiological Technology, Dongnam Health University)
Hwang, Sun-Kwang (Department of Radiology, Kyung Hee University Hospital at Gang-dong)
Lee, Ik-Pyo (Department of Radiology, Kyung Hee University Hospital at Gang-dong)
Kim, Ki-Won (Department of Radiology, Kyung Hee University Hospital at Gang-dong)
Jung, Jae-Yong (Department of Radiation Oncology, Sanggye Paik Hospital)
Lee, Young-Ah (Department of Bio-Technologist and Laboratory Animal, Shingu University College)
Son, Jin-Hyun (Department of Radiological Technology, Shingu University College)
Min, Jung-Whan (Department of Radiological Technology, Shingu University College)
Publication Information
Journal of radiological science and technology / v.38, no.4, 2015 , pp. 365-374 More about this Journal
Abstract
The regular quality assurance (RQA) of X-ray images is essential for maintaining a high accuracy of diagnosis. This study was to evaluate the modulation transfer function (MTF), the noise power spectrum (NPS), and the detective quantum efficiency (DQE) of a computed radiography (CR) system for various periods of use from 2006 to 2015. We measured the pre-sampling MTF using the edge method and RQA 5 based on commission standard international electro-technical commission (IEC). The spatial frequencies corresponding to the 50% MTF for the CR systems in 2006, 2009, 2012 and 2015 were 1.54, 1.14, 1.12, and $1.38mm^{-1}$, respectively and the10% MTF for 2006, 2009, 2012, and 2015 were 2.68, 2.44, 2.44, and $2.46mm^{-1}$, respectively. In the NPS results, the CR systems showed the best noise distribution in 2006, and with the quality of distributions in the order of 2015, 2009, and 2012. At peak DQE and DQE at $1mm^{-1}$, the CR systems showed the best efficiency in 2006, and showed better efficiency in order of 2015, 2009, and 2012. Because the eraser lamp in the CR systems was replaced, the image quality in 2015 was superior to those in 2009 and 2012. This study can be incorporated into used in clinical QA requiring performance and evaluation of the performance of the CR systems.
Keywords
Modulation transfer function (MTF); Noise power spectrum (NPS); Detective quantum efficiency (DQE);
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Times Cited By KSCI : 5  (Citation Analysis)
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