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KMID : 0357520170400030363
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Journal of Radiological Science and Technology
2017 Volume.40 No. 3 p.363 ~ p.370
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Investigation of Physical Imaging Properties in Various Digital Radiography Systems
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Jeong Hoi-Woun
Min Jung-Whan
Yoon Yong-Su
Kim Jung-Min
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Abstract
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We aimed to evaluate the physical imaging properties in various digital radiography systems with charged coupled device (CCD), computed radiography (CR), and indirect flat panel detector (FPD). The imaging properties measured in this study were modulation transfer function (MTF) wiener spectrum (WS), and detective quantum efficiency (DQE) to compare the performance of each digital radiography system. The system response of CCD were in a linear relationship with exposure and that of CR and FPD were proportional to the logarithm of exposure. The MTF of both CR and FPD indicated a similar tendency but in case of CCD, it showed lower MTF than that of CR and FPD. FPD showed the lowest WS and also indicated the highest DQE among three systems. According to the results, digital radiography system with different type of image receptor had its own image characteristics. Therefore, it is important to know the physical imaging characteristics of the digital radiography system accurately to obtain proper image quality.
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KEYWORD
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Digital Radiography , Modulation Transfer Function , Wiener Spectrum , Detective Quantum Efficiency
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