PMID: 7036033Feb 1, 1982Paper

Statistical contrast enhancement of subtraction images for radiographic caries diagnosis

Oral Surgery, Oral Medicine, and Oral Pathology
H G GröndahlR L Webber

Abstract

The effects of the nonlinear contrast-enhancement technique are examined in terms of diagnostic performance obtainable from subtracted dental radiographs for a variety of simulated exposures. Conventional bitewing radiographs of patients known to be free of caries were digitized by means of a computer interfaced with a conventional television camera. The resulting images were duplicated and stored in the computer. Radiolucencies similar in appearance to interproximal caries were simulated analytically in one set of the images. Reference images were superimposed spatially and subtracted from their counterparts containing the induced interproximal lesions after simulating the effects of quantum limited exposure on both sets. This was done for each separate image element independently by replacing original gray levels in each image with levels determined by a Poisson random deviate. The resulting difference images were contrast enhanced by a method which first smooths out local variations in gray level and then reassigns gray-level values in a way determined by the observed second-order spatial statistics. To aid in localization, these images were then again subtracted from the original noise-degraded pictures without lesions, ren...Continue Reading

References

Jun 1, 1971·Oral Surgery, Oral Medicine, and Oral Pathology·R L Webber, L Stark
Jan 1, 1980·Dento Maxillo Facial Radiology·B F Hansen

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Citations

Mar 1, 1997·Computers in Biology and Medicine·T LehmannR Repges
May 1, 1997·Journal of Dentistry·C H VersteegP F van der Stelt
Nov 11, 2010·Dento Maxillo Facial Radiology·B SenelH Avsever
Mar 3, 1998·Dento Maxillo Facial Radiology·A Wenzel
May 18, 2005·Dento Maxillo Facial Radiology·F Haiter-NetoF N Bóscolo
Dec 17, 2008·Clinical Oral Implants Research·N Van AsscheM Quirynen
Jun 1, 1993·Journal of Dentistry·A WenzelH Kalsbeek
Mar 21, 2006·Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics·Won-Jin YiKyung-Hoe Huh
Jun 1, 1989·Oral Surgery, Oral Medicine, and Oral Pathology·D K KassebaumR G Waggener
Sep 1, 1984·Oral Surgery, Oral Medicine, and Oral Pathology·N B Pitts
Jan 1, 1993·Oral Surgery, Oral Medicine, and Oral Pathology·S PrapanpochJ W Preece
Jan 1, 1997·Dento Maxillo Facial Radiology·S C White, D C Yoon
Nov 1, 1985·Journal of Clinical Periodontology·P F van der SteltC L Alons
Aug 1, 1987·Endodontics & Dental Traumatology·E A PasconK Langeland
May 1, 1984·Journal of Clinical Periodontology·J M GoodsonS S Socransky
Jan 1, 1991·Journal of Dental Research·J J Ten Bosch, B Angmar-Månsson
Jun 28, 2011·Operative Dentistry·Robert McAndrewElizabeth T Treasure
Aug 1, 1989·Dento Maxillo Facial Radiology·D A MilesM G Peterson
Aug 1, 1990·Dento Maxillo Facial Radiology·B SvensonA M Lindvall
Nov 1, 1995·Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics·A Wenzel
Oct 1, 1994·Oral Surgery, Oral Medicine, and Oral Pathology·U WelanderA Uddhammar

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