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Proceedings Paper

Multilayer Mirrors as X-ray Filters for Slit Scan Radiography
Author(s): Robert S. Nelson; Zoran L. Barbaric; Anthony R. Ricci; Reuven D. Zach; Magnus Dahlbohm; Lawrence W. Bassett; Eberhard Spiller
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Paper Abstract

X-rays from a radiographic W-anode tube are reflected from a planar multilayer mirror into a slit-like beam of narrow energy bandwidth. The multilayer mirror functions as a tuneable energy filter which could be useful for radiological applications where a high contrast image (mammography, angiography) or tissue composition information (lesions, bone mineral loss) is desired. Low reflectivity at undesired energies permits; 1. operation of the W-anode tube at much higher voltage levels than is possible with conventional filtration, 2. the removal of most of all non-fixed beam filtration. These modifications significantly enhance the useable x-ray fluence. The slit scan imaging format also minimizes detected scattered x-rays and so improves image contrast. A simple model is used to optimize the energy dependent detected signal-to-noise ratio (SNR) with respect to the total energy absorbed by the patient. Theoretical reflectivity curves for ReW-C mirrors which include the effects of surface roughness and layer thickness errors are presented along with W-anode tube spectra reflected from a 2x4 inch ReW-C mirror (11-22Å).

Paper Details

Date Published: 6 May 1985
PDF: 7 pages
Proc. SPIE 0563, Applications of Thin Film Multilayered Structures to Figured X-Ray Optics, (6 May 1985); doi: 10.1117/12.949660
Show Author Affiliations
Robert S. Nelson, UCLA School of Medicine (United States)
Zoran L. Barbaric, UCLA School of Medicine (United States)
Anthony R. Ricci, UCLA School of Medicine (United States)
Reuven D. Zach, UCLA School of Medicine (United States)
Magnus Dahlbohm, UCLA School of Medicine (United States)
Lawrence W. Bassett, UCLA School of Medicine (United States)
Eberhard Spiller, IBM Thomas J. Watson Research Center (United States)

Published in SPIE Proceedings Vol. 0563:
Applications of Thin Film Multilayered Structures to Figured X-Ray Optics
Gerald F. Marshall, Editor(s)

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