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Contrast curves of five different intraoral X-ray sensors: a technical note
Dan Dominik Brüllmann1, Benedikt Kempkes, Bernd d'Hoedt
1Department of Oral Surgery, University Medical Center, Mainz, Germany. bruellmd@uni-mainz.de
Objectives:
The aim of this article is to compare the contrast and resolution properties of five different sensors using a known technical target.
Methods:
Stripe patterns with defined amounts of line pairs per mm (2.5-20 LP/mm) were recorded using five commercial digital sensors. Image data were analyzed using ImageJ and MatLab to calculate different contrast curves using logistic regression.
Results:
The Dexis Platinum Sensor reached a calculated 10% contrast at 29.52 LP/mm. The Duerr VistaRay 6 Sensor reached a 10% contrast at 9.9 LP/mm. The 10% contrast was found at 18.8 LP/mm for the Duerr VistaRay 7. The Sirona Xios+ Sensor reached a calculated 10% contrast at 13.9 LP/mm. The Sirona Fullsize charge-coupled device (CCD) Sensor exhibited 10% contrast at 10.3 LP/mm.
Conclusions:
The contrast transfer function assessment used in the study confirmed that the spatial frequency at 10% contrast was much lower than the theoretical resolution computed from the pixel size.
