PMID: 3321498Jan 1, 1987Paper

Computer-assisted subtraction radiography in periodontal diagnosis

Swedish Dental Journal. Supplement
K Gröndahl

Abstract

In the diagnosis of periodontal disease radiography serves as an adjunct to clinical methods to determine the extent of bone involvement. At subsequent examinations radiography is used to e.g. evaluate the course of disease and the effect of treatment. Differences between examinations due to biological changes often occur against a complex background of stationary anatomical structures and the signals of diagnostic interest are therefore often concealed in structured noise. This imposes severe constraints on the radiographic diagnosis of changes in the periodontal bone over time. A method was developed to reduce the amount of structured noise by subtracting identical image features in serial radiographs which had been digitized, using a high quality TV-camera interfaced with an analog to digital converter and a computer. When the technique was applied to standardized radiographs taken before and after small lesions had been made in the marginal crest of dry human mandibles, observers were able to detect those lesions more accurately than in the conventional radiographs from which the computer-assisted subtraction images were produced. The sensitivity increased from 51% to 91% while the specificity remained unchanged at about 95...Continue Reading

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