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박철규,조효성,제의규,홍대기,이민식,박연옥,Yoonseok Kang,Jinsoo Kim,Nagkun Chung,Jinwon Kim,Jinguk Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.9
The most critical problem remaining as an obstacle for the successful use of antiscatter gridsin digital X-ray imaging is probably the observation of grid line artifacts such as moir´e patternsand shadows of the grid strips themselves in X-ray images, resulting in a risk of misdiagnosis byphysicians. In this paper, in order to find a practical solution to the problem of grid line artifacts, werevisited the moving grid technique and investigated its proper imaging conditions. We implementeda simple and useful moving-grid analysis code, iTOMTM, and performed systematic simulations fora theoretical analysis. We also performed experiments and compared the results to the simulatedones to demonstrate the effectiveness of the code. According to our simulation and experimentalresults, the grid line artifacts can be effectively reduced when the grid moves with a large velocityor with specific velocities that reduce the coefficient of variation (CV), even with a small velocity. These velocities are determined by using the related parameters such as the grid pitch, the gridstrip width, and the exposure time.