Journal of Dental Research, Vol 63, 1032-1036, Copyright © 1984 by International & American Associations for Dental Research Online Journals

ARTICLES

Computer correction of projective distortions in dental radiographs

R. L. Webber, U. E. Ruttimann and R. A. Groenhuis

Distortions in radiographic images caused by changes in shape and position of the film relative to the x-ray beam can result in registration artifacts which interfere with interpretation of subtracted images. A warping transformation is described which maps known points of reference in one image into homologous points in another. The corrected image pair can then be superimposed and subtracted with significantly-reduced differences in registration to facilitate the detection of localized changes of diagnostic interest.

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