Use Of Image Similarity For The Selection Or Synthesis Of Projections For Subtraction Radiography

Urs E. Ruttimann; Paul F. van der Stelt; Richard L. Webber

doi:10.1117/12.975406

12 June 1986 Use Of Image Similarity For The Selection Or Synthesis Of Projections For Subtraction Radiography

Urs E. Ruttimann, Paul F. van der Stelt, Richard L. Webber

Proceedings Volume 0626, Application of Optical Instrumentation in Medicine XIV and Picture Archiving and Communication Systems; (1986) https://doi.org/10.1117/12.975406
Event: Application of Optical Instrumentation in Medicine XIV and Picture Archiving and Communication Systems (PACS IV) for Medical Applications, 1986, Newport Beach, CA, United States

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.

Citation Download Citation

Urs E. Ruttimann, Paul F. van der Stelt, and Richard L. Webber "Use Of Image Similarity For The Selection Or Synthesis Of Projections For Subtraction Radiography", Proc. SPIE 0626, Application of Optical Instrumentation in Medicine XIV and Picture Archiving and Communication Systems, (12 June 1986); https://doi.org/10.1117/12.975406

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