Variables affecting the interpretation of digital dental radiographs

INTRODUCTION The aim of this study was to determine the percentage of computer monitors with optimal contrast and spatial resolution when viewing dental radiographs by assessing a test pattern. The objectives were to determine the factors affecting the viewing conditions of radiographs and to establish methods to optimise these. METHODS Prospective data collection was undertaken with 109 computer monitors, assessing the viewing conditions of the test pattern. Faults were recorded using a standardised form. A reaudit was completed after the implementation of monitor hoods. RESULTS Only 16% of computer monitors met the set standard. More spatial resolution faults were documented than contrast faults (55% vs 45%). A higher proportion of faults was recorded on days with sunny weather (64%) than when it was cloudy, rainy or clear (9–14%). Similarly, there was a higher proportion of faults on monitors that demonstrated full light reflection than those showing no light reflection (26% vs 9%). The reaudit demonstrated improvement, with 32% of monitors meeting the set standard. CONCLUSIONS Reducing extraneous light sources is critical to improving viewing conditions. Despite improvement in computer monitor quality, lack of calibration of monitors highlights the importance of optimising viewing conditions. The intention is to continue to integrate methods to improve display quality, which will help improve patient care.