Comparison of the performance of intraoral X-ray sensors using objective image quality assessment

Publication date: Available online 13 February 2016
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Kristina Hellén-Halme, Curt Johansson, Mats Nilsson
ObjectivesThe main aim of this study was to evaluate the performance of ten individual sensors of the same make using objective measures of key image quality parameters. A further aim was to compare eight different brands of sensors.Material and methodsTen new sensors of eight different models from six manufacturers, i.e. 80 sensors, were included in the study. All sensors were exposed in a standardized way using an X-ray tube voltage of 60 kVp and different exposure times. Sensor response, noise, low-contrast resolution, spatial resolution and uniformity were measured.ResultsIndividual differences between sensors of the same brand were surprisingly large in some cases. There were clear differences in the characteristics of the different brands of sensors. The largest variations were found for individual sensor response for some of the brands studied. Also, noise level and low contrast resolution showed large variations between brands.ConclusionsSensors, even of the same brand, vary significantly in their quality. It is thus valuable to establish action levels for the acceptance of newly delivered sensors and to use objective image quality control for commissioning purposes and periodic checks to ensure high performance of individual digital sensors.



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