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Proceedings Paper

Direct scatter distribution measurements: comparison to Monte Carlo simulations
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Paper Abstract

"Direct" measurement of the scatter point spread function (PSF) was obtained with a digital imaging system for the purpose of comparison of a Monte Carlo (MC) scatter distribution algorithm that takes into account polychromatic spectra and detector absorption characteristics. An image intensifier (II) TV system was used to experimentally acquire digital x-ray scatter images in a geometry designed to eliminate detection of the primary beam and to optimize the dynamic range for scattered radiation as well as correct for image variations caused by veiling glare and shading. Both computer generated and experimentally acquired scatter data were measured in concentric annular bins and individually integrated to provide a direct PSF profile. Results indicate a good match between the MC and experimental PSFs for homogeneous scatter distributions at short range airgaps and radial distances. Discrepancies at larger radial distances are likely due to the spherical II input phosphor geometry. For an ll/1'V system detector, therefore, geometric image warping correction for pincushion distortion is indicated, as well as modifications in the MC algorithm for geometry of the detector. This will help to minimize differences between simulated and measured system characteristics.

Paper Details

Date Published: 1 July 1990
PDF: 10 pages
Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); doi: 10.1117/12.18831
Show Author Affiliations
James Anthony Seibert, Univ. of California Medical Ctr./Davis (United States)
John M. Boone, Thomas Jefferson Univ. (United States)

Published in SPIE Proceedings Vol. 1231:
Medical Imaging IV: Image Formation
Roger H. Schneider, Editor(s)

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