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논문 기본 정보

자료유형
학술저널
저자정보
이태웅 (KEPCO KPS) 이원호 (고려대학교)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제53권 제7호
발행연도
2021.7
수록면
2,371 - 2,376 (6page)
DOI
https://doi.org/10.1016/j.net.2021.01.027

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초록· 키워드

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As the g-ray energy increases, a reconstructed image becomes noisy and blurred due to the penetrationof the g-ray through the coded mask. Therefore, the thickness of the coded mask was increased for highenergy regions, resulting in severely decreased the performance of the detection efficiency due to selfcollimationby the mask. In order to overcome the limitation, a modified uniformly redundant array grayimaging system using dual anti-mask method was developed, and its performance was comparedand evaluated in high-energy radiation region. In the dual anti-mask method, the two shadow images,including the subtraction of background events, can simultaneously contribute to the reconstructedimage. Moreover, the reconstructed images using each shadow image were integrated using a hybridupdate maximum likelihood expectation maximization (h-MLEM). Using the quantitative evaluationmethod, the performance of the dual anti-mask method was compared with the previously developedcollimation methods. As the shadow image which was subtracted the background events leads to ahigher-quality reconstructed image, the reconstructed image of the dual anti-mask method showed highperformance among the three collimation methods. Finally, the quantitative evaluation method provesthat the performance of the dual anti-mask method was better than that of the previously reconstructionmethods

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