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KMID : 1001220070090010007
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Journal of the Korean Society of Digital Medical Imaging Technology
2007 Volume.9 No. 1 p.7 ~ p.15
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A Study of Image Characteristics due to Focus-Grid and Head Phantom Decentering from the Armorphos Silicon Thin Film Transistor Detector the Fixed Focus-Grid is Applied
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Choi Jun-Ku
Kim Byoung-Gi
Cha Seon-Hwa
Kim Kyung-Soo
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Abstract
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This study aim to investigate image characteristics due to focus-grid and head phantom decentering from the armorphos silicon thin film transistor detector the fixed focus-grid is applied, wish to propose right use method of digital medical equipment. Acquired image according to focus-grid and head phantom position decentering using head phantom on armorphos silicon thin film transistor detector the fixed focus-grid is applied. acquired image evaluate pixel value, histogram, plot profile, surface plot using NIH (Image J) image analysis program and compared decentering image with standard image. Mean value and standard deviation value of focus-grid lateral decentering and duplex decentering of focus-grid and head phantom decreased by ratio, consequently increase of horizontality, diagonal decentering. also, deteriorated contrast of image because frequency of high pixel value decreases fairly. according increases decentering, image distortion phenomenon was increase, by next time, pixel mean value of head phantom decentering was no big change but horizontality, diagonal, mean value and standard deviation value of pixel decreased by ratio. Even if increase pixel noise of image because wide latitude and post processing ability of digital detector, radiotechnologist can not recognize. Therefore, radiotechnologist must recognize correctly the photographing factors which increases pixel noise on the grid system installation digital detector and should exam.
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KEYWORD
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Armorphos silicon thin film transistor detector, Head phantom, Fixed ocus-grid, Decentering, Pixel value
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