X-ray response of a digital detector for dental radiographs. (September 2016)

• Record Type: Journal Article
• Authors: Kalyvas, N.; Maragkaki, P.; Bakas, A.; Fountos, G.; Koukou, V.; Martini, N.; Michail, C.; Valais, I.; Kandarakis, I.
• Is Part Of: Physica medica. Volume 32(2016)Supplement 3
• Page Start: 286
• Page End: 287
• Publication Date: 2016-09
• Subjects: Medical physics -- Periodicals; Biophysics -- Periodicals; Biophysics -- Periodicals; Imagerie médicale -- Périodiques; Radiothérapie -- Périodiques; Rayons X -- Sécurité -- Mesures -- Périodiques; Physique -- Périodiques; Médecine -- Périodiques; 610.153
• DOI: 10.1016/j.ejmp.2016.07.104
• Languages: English
• ISSNs: 1120-1797

Abstract

Abstract : Introduction: Current dental imaging technology offers indirect detectors capable of digital imaging. These detectors incorporate a scintillator coupled to a photoreceptor. Purpose: The purpose of this work is to study the X-ray response of a commercially available SCHICK CDR CMOS detector for dental radiography, in terms of detector response (mean pixel value and standard deviation) per incident air-kerma and the spatial resolution. Materials and methods: The detector was uniformly exposed at a Del Medical Eureka X-ray radiographic system at high voltages of 60 kV and 70 kV. The range of the incident air-kerma, measured with the RTI PIRANHA X-ray multimeter, was varying between 0.047 mGy and 0.225 mGy. The mean pixel value and the standard deviation of the derived DICOM images were measured with RadiAnt (Medixant) available software. Spatial resolution was optically estimated by visualizing the image of an irradiating Type1-83 bar pattern. All images were evaluated in 'for presentation' format, in 8 bit format. Results: The detector shows linear response up to 0.170 mGy for 60 kV and up to 0.145 mGy for 70 kVp. For higher air-kerma, mean pixel values tend to saturated at 255 grey level value. The saturation was faster at 70 kV. The coefficient of variation, as well as the standard deviation was found to reduce with respect to incident air-kerma for both X-ray tube voltages. Spatial resolution was observed approximately 10 lp/mm at 60 kVp and 9 lp/mm at 70 kVp. Conclusion: The observed digital detector was found to have better resolution and dynamic range characteristics at 60 kVp. Disclosure: No disclosure.