Dentomaxillofacial Radiology, Vol 29, Issue 2 76-80, Copyright © 2000 by British Institute of Radiology

ARTICLES

An objective comparison of four digital intra-oral radiographic systems: sensitometric properties and resolution

K. Araki, A. Endo and T. Okano
Department of Oral Radiology, Showa University School of Dentistry, Kitasenzoku 2-1-1, Ohta-ku, Tokyo, 145-8515, Japan.

OBJECTIVES: To compare the sensitometric properties and resolution of four digital intra-oral radiographic systems. METHODS: Three CCD-based systems were evaluated, RVG-4 (Trophy Radiologic, Paris, France) CDR (Schick Technologies Inc, Long Island, NY, USA) and Dixel (Morita, Kyoto, Japan) and a photostimulable phosphor system (Digora, Soredex-Orion, Helsinki, Finland). The sensitometric properties were determined by measuring the gray levels at increasing exposures without making any gray-scale adjustments. MTF was measured using images of a 10 microns width slit inclined to the long and short axes of the detectors. RESULTS: The CCD-based systems showed a linear relationship between exposure and gray level although there were some differences in sensitivity. In RVG-4, the gray level saturated at a lower exposure. Digora showed a logarithmic relationship at uniform exposure. However, there was a linear relationship when it was exposed below the calibration dose. The MTF was highest with RVG-4 and the lowest with the Digora. CONCLUSIONS: Each system has its own specific properties; RVG-4 has the highest resolution with the narrowest latitude, whereas Digora has the wider latitude but the lowest resolution.

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