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Dentomaxillofacial Radiology, Vol 27, Issue 5 287-292, Copyright © 1998 by British Institute of Radiology

ARTICLES

A radiographic method for measuring radiation dose based on beam quality

K. Syriopoulos, X. L. Velders, W. G. Geraets and P. F. van der Stelt
Department of Oral Radiology, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.

OBJECTIVES: To develop a radiographic method for measuring radiation dose based on beam quality for inexpensive postal surveys of general dental practitioners. METHODS: Different beam qualities were simulated to expose a commercially available film (X-Omat MA 18 x 22.4 cm, Ready Pack, Kodak Pathe, Paris, France). Density and contrast curves were fitted by means of 4th-degree polynomial functions. The curves were used to estimate beam quality (as the first HVL) and radiation dose in air for 22 different dental X-ray machines by means of linear interpolation. These estimations were compared with the measurements obtained with the NERO system and an ionization chamber (paired t-test). RESULTS: No significant differences were found between the radiographic and the conventional methods in determining beam quality and radiation dose. CONCLUSIONS: The radiographic method can be used to determine beam quality and radiation dose of dental X-ray machines from a single exposure. The radiographic method is simple and inexpensive and causes a minimum of disruption to the dental practice.




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Copyright © 1998 by the British Institute of Radiology.