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Proceedings Paper

Computer-Assisted Microdensitometry Of Bone
Author(s): Richard Moore; Robert S. Ledley
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Paper Abstract

A calculation was performed of the attenuation of X-rays in passing through a tantalum filter and a layer of standardized compact bone. The calculations took into account the heterogeneity of the output of the X-ray tube and the energy dependence of the mass absorption coefficients of the material in which the radiation was absorbed. A similar calculation was made for the attenuation of X-rays in passing through a tantalum filter and an alumunum step wedge. The results of the two calculations were compared, and the comparison was used to estimate the thickness of compact bone which would produce the same darkening of the X-ray film as a given thickness of aluminum. This comparison was contrasted with the results from a simple formula (based on the assumption of monochromatic radiation) which related bone thickness to aluminum thickness to produce the same degree of darkening of the film. The simple formula produced a value for the thickness of bone from the calculation based on polyenergetic radiation. The method provides an algorithm for automatic quantitative roentgenography.

Paper Details

Date Published: 9 December 1969
PDF: 7 pages
Proc. SPIE 0018, Pattern Recognition Studies I, (9 December 1969); doi: 10.1117/12.946838
Show Author Affiliations
Richard Moore, National Biomedical Research Foundation (United States)
Robert S. Ledley, National Biomedical Research Foundation (United States)

Published in SPIE Proceedings Vol. 0018:
Pattern Recognition Studies I

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