![]() ![]() Beyond the optimal level, the RVG-S outperformed the VIXA system. The two systems performed equally at optimum exposure when the dose is approximately the same irrespective of the presence or absence of niobium filtration. ![]() Addition of niobium filtration did not appreciably alter the radiation dose required to perceive a given number of defects using either system. The optimum exposures were similar for the two systems, but the dynamic range was greater for the RVG-S. Perceptibility curves were developed for both sensors under the various filtration conditions and exposures.Īt optimum exposures both the VIXA and the RVG-S permitted the same number of defects to be observed. Images of a 7 mm aluminium test object with defects ranging from 0.1 to 1.5 mm with standardized projection geometry. To compare the first generation VIXA (Gendex, Milan, Italy) and the RVG-S (Trophy Radiologie, Vincennes, France) for detection of defects in an aluminium test object at various exposures both with and without added niobium filtration. The pulp width and length from radiographs of 6 selected teeth, namely, maxillary central incisor, lateral incisor, and second premolar and mandibular lateral incisor, canine, and first premolar of either right or left side were measured using the RVG trophy software Trophy Windows is a software program supplied by Trophy Radiologie (Trophy.
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