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KMID : 0357520140370020093
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Journal of Radiological Science and Technology
2014 Volume.37 No. 2 p.93 ~ p.100
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An Analysis of Factors That Affect Image Quality Deterioration in The Potable X-ray Examination on using Digital Wireless Detector
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Yu Young-Eun
Lim Cheong-Hwan
Ko Joo-Young
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Abstract
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Recently the development of portable digital wireless imaging system, which acquires digital radiation images by using wireless LAN telecommunications function in an easy and fast way, provides lots of convenience for people. Considering the characteristics of portable imaging tests on emergency and critical patients, this study aims to suggest guidelines for Digital wireless detector by evaluating the effect of de-centering of focus-grid and displacement of subject in detector on the quality of image. The equipments used for this study were Elmo-T6 Digital Mobile X-ray system (SIMAZU Corp.), el Tor ($14{ imes}17$ 수식 이미지 "Wireless detector), Grid (10:1) and Chest & head phantom. After acquiring post-processing image according to dose increase and de-centering image of grid-focus and head phantom displacement image, this study compared, analyzed and evaluated these images by using a digital image analysis program by Image J. In the change of images based on dose increase, images were rough in the dose of 0.5 mAs, while there was no difference among images in the proper dose of 1~2 mAs and, especially from 2.5 mAs, average value of pixels radically decreased, affecting contrast. Over 3 mAs, contrast dropped due to saturation phenomenon of lungs. As the result of analysis using Image J program, with the increase of displacement between focus-grid and head phantom, the frequency of low pixel value also increase, causing the outline of surface image to disappear, which in turn affects contrast. For better quality imaging, a radiographer must be aware before the time of test that the image quality can be changed based on the critical patients posture, movement, respiration, displacement of X-ray tube and distance of imaging.
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KEYWORD
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Digital radiation, Digital wireless detector, Displacement, Contrast, Portable imaging
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