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Evaluation of CRT-displayed and printout image quality in digital rotational panoramic radiography system Comparison between images obtained by the Combi-X and Paxorama2000 computed radiography systems and analogue images on film, and effects of unsharp masking filter



Evaluation of CRT-displayed and printout image quality in digital rotational panoramic radiography system Comparison between images obtained by the Combi-X and Paxorama2000 computed radiography systems and analogue images on film, and effects of unsharp masking filter



Shikwa Gakuho 100(9): 843-857



Image quality evaluation of rotational panoramic radiographs obtained by the Combi-X(R) and Paxorama2000(R) photostimulable storage phosphor-based computed radiography systems was performed. The quality of both CRT-displayed and printout images, with and without processing by an unsharp masking filter, as methods of displaying digital image media, was examined and these were further compared with images on film. Twenty-one volunteers gave informed consented to the examination. Six Radiology Department dentists evaluated each image separately. Items for the evaluation were determined on the basis of the depiction of anatomical structure as follows; teeth and periodontium in both maxilla and mandible, an outline of bony wall structure of the maxillary sinus, mandibular canal and alveolar trabeculae, outer contours of the mandible and mandibular condyle. Five-grade scores, 1-poor, 2-sub-standard, 3-acceptable, 4-good, 5-excellent, were employed for evaluating the clarity of anatomical structures. Means ranged between 2.18 and 4.55 for the Combi-X, and between 2.50 and 4.47 for the Paxorama2000, yielding an overall score around 4-good for all display methods, except for the low evaluation of the printout images without the unsharp masking filter. Scores were relatively low in the teeth and periodontium evaluation, but high in the evaluation of the outer contour of bony structures. The unsharp masking filter improved the overall scores. There was no significant difference in each item evaluated among the three display methods. The CRT images were comparable to the film images. Even the low-cost printout method, which was especially used in images processed by the unsharp masking filter, revealed results equal to film and CRT for each evaluation.

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