Objective: The purpose of the present study was to develop an algorithm that could practically achieve super-resolution images on clinical panoramic X-ray equipment using the detector moving and frame additional technique (DEMOT), a method for obtaining super-resolution images.
Materials and Methods: Simulations were performed to evaluate the resolution obtained by changing a combination of the frame rate, which was set at a sufficient level to achieve a super-resolution effect; the practical magnification ratio; and the focus size of the X-ray tube. The results were confirmed using panoramic X-ray equipment that could be used at clinical facilities.
Results: When evaluating the frame rate, as the amount of data added during each one-pixel movement increased, an improvement in contrast was recognized within each frequency band. As for the appropriate magnification ratio, an experiment using focus sizes ranging from 0.10mm to 0.15mm showed that the cut-off frequency improved as the magnification ratio increased. Therefore, greater resolution was achieved as the magnification ratio increased. When a focus size of 0.20mm was employed, the highest resolution was obtained with magnification ratios ranging from 1.45 to 1.50 times. When a focus size of 0.30mm was used, the highest resolution was obtained with magnification ratios ranging from 1.25 to 1.30 times. When a focus size of 0.50mm was employed, the highest resolution was obtained with magnification ratios ranging from 1.10 to 1.15 times.
Conclusion: The optimum technique for achieving super-resolution images with the DEMOT is to divide the memory by >4. By using standard panoramic X-ray equipment with magnification ratios ranging from approximately 1.2 to 1.3 times, an appropriate super-resolution effect can be obtained using an X-ray tube with a focus size of ≤0.2mm.
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