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Dentomaxillofacial Radiology, Vol 24, Issue 4 215-220, Copyright © 1995 by British Institute of Radiology

ARTICLES

Measurement accuracy: a comparison of two intra-oral digital radiographic systems, RadioVisiography-S and FlashDent, with analog film

W. C. Scarfe, S. Norton and A. G. Farman
University of Louisville School of Dentistry, Kentucky, USA.

OBJECTIVES: To compare the accuracy of measurement algorithms incorporated into the software provided with two CCD-based digital radiographic systems and compare assessments using intra-oral film. METHODS: A test object with three radiopaque reference points was imaged using Ektaspeed intra-oral film, both with and without an overlaid 1 mm reference grid, the RVG-S, the measurement software of which overlays a 2 mm grid, and the FlashDent, which uses a mouse-driven cursor to estimate distances. Geometric factors, including source-to-object and receptor-to-object distances, vertical and horizontal cone angulation, and vertical angulation of receptor, were successively altered. Six viewers estimated vertical, horizontal and diagonal distances for each image. RESULTS: Increased source-to-object distance resulted in a 5-10% reduction in image dimensions, whereas increased receptor-to-object distance produced a magnification of 15-20% with all techniques. Increased vertical and horizontal cone angulation resulted in slight increases in magnification (0-5%) whereas greater receptor angulation resulted in noticeable magnification under all test conditions (10-15%). Estimated values for vertical, horizontal and diagonal measurements were approximately 5-10% higher than the actual dimensions, irrespective of the technique used. The FlashDent mouse-driven cursor system and direct measurement of distances from conventional film were more accurate in horizontal and diagonal dimension estimates than using an overlaid grid. Intra-observer and inter-observer differences were found for specific situations. CONCLUSION: The mouse-driven computerized measurement cursor and intra-oral film assessment using a ruler provided the most accurate, reliable and consistent dimensional measurements.


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H Kitagawa and A. Farman
Effect of beam energy and filtration on the signal-to-noise ratio of the Dexis intraoral X-ray detector
Dentomaxillofac. Radiol., January 1, 2004; 33(1): 21 - 24.
[Abstract] [Full Text] [PDF]


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Copyright © 1995 by the British Institute of Radiology.