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Proceedings Paper

Spectral Selectivity In Radiography Using A Grating Encoding System
Author(s): Albert Macovski; Robert E. Alvarez; Joseph L-H Chan
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Paper Abstract

Existing radiographs, or x-ray projec-tions, record the transmission of various materials to a broad spectrum of x-ray energies. It would be highly desirable if specific spectral regions could be isolated. For example the absorption region for contrast material, iodine and barium, occurs in specific regions of the energy spectrum. If the information relating to contrast material absorption could be separately delineated, many diagnostic procedures could be greatly facilitated. Similarly lower energy regions which are more responsive to bones and calcifications could be delineated from higher energy regions where the absorption is due mainly to Compton scattering and thus dependent mostly on tissue density rather than atomic number. The separation of these two spectral regions in a processed radiograph would allow the radiologist to look through the bony pattern and thus see soft tissue, lesions, and airways which underlie the bone. For example, lung tumors under the ribs could be clearly delineated rather than being obscured.

Paper Details

Date Published: 1 March 1974
PDF: 7 pages
Proc. SPIE 0052, Coherent Optical Processing, (1 March 1974);
Show Author Affiliations
Albert Macovski, Stanford University (United States)
Robert E. Alvarez, Stanford University (United States)
Joseph L-H Chan, Stanford University (United States)

Published in SPIE Proceedings Vol. 0052:
Coherent Optical Processing
H. John Caulfield, Editor(s)

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