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Proceedings Paper

Use Of Image Similarity For The Selection Or Synthesis Of Projections For Subtraction Radiography
Author(s): Urs E. Ruttimann; Paul F. van der Stelt; Richard L. Webber
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Paper Abstract

The use of subtraction radiography in dentistry is impeded by the necessity to couple physically the x-ray source, the patient and the film, in order to achieve a reproducible projection geometry. This need can he obviated by the ability to synthesize arbitrary projection images from a basis set of projections bearing a known geometric relationship to each other. Implementation of this method requires knowledge of the projection angle of the desired projection image relative to the basis set. This investigation explores the feasibility of using the gray-level standard deviations in corresponding subtraction images as similarity measures, in order to determine retrospectively the projection angle of a radiograph of interest with respect to the set of basis projections. An iterative coordinate estimation procedure is developed incorporating this technique, and its accuracy is evaluated using radiographs obtained from dry skull specimens.

Paper Details

Date Published: 12 June 1986
PDF: 7 pages
Proc. SPIE 0626, Application of Optical Instrumentation in Medicine XIV and Picture Archiving and Communication Systems, (12 June 1986); doi: 10.1117/12.975406
Show Author Affiliations
Urs E. Ruttimann, National Institutes of Health (United States)
Paul F. van der Stelt, National Institutes of Health (United States)
Richard L. Webber, National Institutes of Health (United States)


Published in SPIE Proceedings Vol. 0626:
Application of Optical Instrumentation in Medicine XIV and Picture Archiving and Communication Systems
Samuel J. Dwyer; Roger H. Schneider, Editor(s)

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