Computer correction of projective distortions in dental radiographs.
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.
D003201:Computers; D006801:Humans; D008962:Models, Theoretical; D011856:Radiographic Image Enhancement / Q000379:methods*; D011861:Radiography, Dental / Q000295:instrumentation / Q000379:methods*; D013382:Subtraction Technique