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1 March 1974 Spectral Selectivity In Radiography Using A Grating Encoding System
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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.
© (1974) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Albert Macovski, Robert E. Alvarez, and Joseph L-H Chan "Spectral Selectivity In Radiography Using A Grating Encoding System", Proc. SPIE 0052, Coherent Optical Processing, (1 March 1974);


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