Yoshiura K, Welander U, Li G, Shi XQ, McDavid WD, Kawazu T, et al. Comparison of the psychophysical properties of various intraoral film and digital systems by means of the perceptibility curve test. Yoshiura K, Welander U, McDavid WD, Li G, Shi XQ, Nakayama E, et al. The perceptibility curve test applied to direct digital dental radiography. Yoshiura K, Stamatakis H, Shi XQ, Welander U, McDavid WD, Kristoffersen J, et al. Correlation between diagnostic accuracy and perceptibility. Yoshiura K, Okamura K, Tokumori K, Nakayama E, Chikui T, Goto TK, et al. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. Assessment of image quality in dental radiography, part 2: optimum exposure conditions for detection of small mass changes in 6 intraoral radiography systems. Yoshiura K, Kawazu T, Chikui T, Tatsumi M, Tokumori K, Tanaka T, et al. A simplified method to obtain perceptibility curves for direct dental digital radiography. Stamatakis HC, Yoshiura K, Shi XQ, Welander U, McDavid WD. This method can be used to evaluate the image quality of new digital systems. The areas under the PCs in a grayscale domain were highly correlated with observer performance. The correlation between the number of perceptible holes and the areas under the PCs at each exposure for the four systems was relatively high ( r = 0.92). The Dixel and Digora Optime showed similar PCs, and their minimum perceptible gray level differences were the smallest among the systems. The correlation between the perceptible contrast information and the number of perceptible holes by observers at each exposure was examined for all four digital systems. By combining the PCs at all exposures for each system, the maximum perceptible contrast information in each system was calculated. The area under the PC was assumed to be the perceptible contrast information at that exposure for each system. The minimum perceptible gray level differences at a given exposure were calculated from the mean gray values and standard deviations, and a PC in the grayscale domain was constructed at each exposure for all devices. The mean gray values and their standard deviations were measured for each step as well as the background of the images for each device. An aluminum phantom with 12 steps was radiographed using all four systems. Methodsįour systems were evaluated, namely the CDR, Dixel, Digora, and Digora Optime. To evaluate four digital intraoral radiographic systems using perceptibility curves (PCs) in a grayscale domain and to clarify the usefulness of this new method.
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