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Quantitative assessment of a new dental imaging system

A. Walker, MSc, BSc K. Homer, MSc, FDS, DDRRCR ^* J. Czajka, BSc A. C. Shearer, MSc BDS, FDS and N. H. F. Wilson, PhD, MSc, FDS

North Western Medical Physics Department, Christie Hospital and Holt Radium Institute, Wilmslow Road, Manchester M20 9BX ^* Unit of Radiology, Department of Oral Medicine, Department of Restorative Dentistry, University Dental Hospital of Manchester, Higher Cambridge Street, Manchester M15 6FH, UK Unit of Conservative Dentistry, Department of Restorative Dentistry, University Dental Hospital of Manchester, Higher Cambridge Street, Manchester M15 6FH, UK

The "Radiovisiography" dental imaging unit (Trophy UK Ltd) is a digital system using an intensifying screen and charge-coupled device in an intra-oral sensor. This paper presents a description of the system and an assessment of the original model in terms of patient dose (relative to film systems), resolution (limiting resolution and modulation transfer function), distortion and image noise (amplitude). The system does offer the possibility of reduced patient exposure and minimal distortion, although resolution and latitude are inferior to standard dental film.

Key Words: Dental radiography • Digital techniques

Received for publication September 1, 1990. Revision received January 1, 1991.