Direct scatter distribution measurements. Comparison to Monte Carlo simulations

Research output: Chapter in Book/Report/Conference proceedingConference contribution


'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 PSF's 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 II/TV 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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsH.Roger Schneider
Place of PublicationBellingham, WA, United States
PublisherPubl by Int Soc for Optical Engineering
Number of pages10
ISBN (Print)0819402753
StatePublished - 1990
EventMedical Imaging IV: Image Foundation - Newport Beach, CA, USA
Duration: Feb 4 1990Feb 6 1990


OtherMedical Imaging IV: Image Foundation
CityNewport Beach, CA, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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