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Dentomaxillofacial Radiology, Vol 31, Issue 2 117-125, Copyright © 2002 by British Institute of Radiology

ARTICLES

Correction for attenuation and visual response in digital radiography

U. Welande, K. Yoshiura, G. Li, P. Sallstrom and W. D. McDavid
Department of Oral Radiology, Karolinska Institutet, Stockholm, Sweden. Ulf.Welander@ofa.ki.se

OBJECTIVES: To derive a method to correct for the exponential attenuation adding visual linearization for digital radiography and to perform an experimental test to study effects on observer performance. METHOD: A theoretical analysis was performed and expressions were derived to correct radiographic data for the attenuation. An experiment was performed exposing an aluminum step wedge with holes of increasing depths behind each step plus soft tissue simulation. Seven original images were created with a digital intraoral X-ray sensor and a further 14 transformed images produced. Ten observers examined the images in a randomized order reporting the number of holes seen per wedge step. The results were analysed by One Way ANOVA. RESULTS: It was possible to correct for attenuation and the response of the human visual system to light intensities from a computer monitor. Perception was significantly improved in all recalculated radiographs that took both attenuation and the response of the eye into account (P-values ranged from <0.0001 to <0.0286). CONCLUSIONS: The transforms may be useful for improved perception when viewing digital radiographs.


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