Digital Subtraction Of Radiographs As An Aid For Detecting Pathologic Changes In Periodontal Bone

Richard L. Webber; Urs E. Ruttimann

doi:10.1117/12.934505

1 November 1982 Digital Subtraction Of Radiographs As An Aid For Detecting Pathologic Changes In Periodontal Bone

Richard L. Webber, Urs E. Ruttimann

Proceedings Volume 0372, Physics and Engineering in Medical Imaging; (1982) https://doi.org/10.1117/12.934505
Event: International Workshop on Physics and Engineering in Medical Imaging, 1982, Pacific Grove, United States

Abstract

Serial periapical dental radiographs are produced using a constant exposure geometry made possible by a simple occlusal template. Selected radiograph pairs are placed in register with the aid of a micromanipulator and a closed-circuit video system. The same video system, interfaced with an A to D converter, is used to store the respective radiographs as 6 bit images in a frame buffer. A computer is then used to subtract the two images. Gamma correction is accomplished with special software to assure that any non-linear effects attributable to contrast differences between radiographs are minimized. Blurring of the difference image, in an area known to be unchanged, provides a means for thresholding out differences attributable to registration artifacts. Preliminary data on both patients and radiographic phantoms demonstrate that diagnostic accuracy from subtracted images is markedly improved when compared to that obtainable from the undigitized control radiographs displayed conventionally.

Citation Download Citation

Richard L. Webber and Urs E. Ruttimann "Digital Subtraction Of Radiographs As An Aid For Detecting Pathologic Changes In Periodontal Bone", Proc. SPIE 0372, Physics and Engineering in Medical Imaging, (1 November 1982); https://doi.org/10.1117/12.934505

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