고정형 (Stationary-gantry) 희소뷰 (Sparse-view) CT 보안검색시스템의공간분해능 평가
The Evaluation of Spatial Resolution of Stationary-gantry Sparse-view CT Security-screening System
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초록
In this study, the image quality assessment, especially spatial resolution evaluation, forSparse-view CT reconstructed images was performed. The main goal of the experiment is to evaluateModulation Transfer Function by using American Standard Method for Measurement of ComputedTomography System Performance (ASTM E1695-95) which uses the edge test object. To compare with theASTM method, a different method, the radial-type edge profile, to measure MTF using the edge methodalso performed. Both approaches were tested on the same image acquired by the stationary-gantrysparse-view CT security-screening system using cylindrical test phantom manufactured in accordancewith ANSI 42.45. Both of the spatial resolutions at 10% modulation are 0.195, 0.203 lp pixel-1, respectively. The method implemented by ASTM E1695-95 showed higher reliability and had a relatively more accuratespatial resolution result than the radial-type edge profile method.
Abstract
In this study, the image quality assessment, especially spatial resolution evaluation, forSparse-view CT reconstructed images was performed. The main goal of the experiment is to evaluateModulation Transfer Function by using American Standard Method for Measurement of ComputedTomography System Performance (ASTM E1695-95) which uses the edge test object. To compare with theASTM method, a different method, the radial-type edge profile, to measure MTF using the edge methodalso performed. Both approaches were tested on the same image acquired by the stationary-gantrysparse-view CT security-screening system using cylindrical test phantom manufactured in accordancewith ANSI 42.45. Both of the spatial resolutions at 10% modulation are 0.195, 0.203 lp pixel-1, respectively. The method implemented by ASTM E1695-95 showed higher reliability and had a relatively more accuratespatial resolution result than the radial-type edge profile method.
참고문헌 (6)
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- "ANSI42.45-2011. American National Standard for Evaluation the Image Quality of X-ray Computed Tomography (CT) Security-Screening Systems", IEEE Standards Assosication, ~ (2011)
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