Characterization of medium and high energy collimators using ray-tracing and Monte Carlo methods

D. P. Lewis, B. M.W. Tsui, C. Tocharoenchai, E. C. Frey

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

Abstract

We developed methods to characterize hole pattern artifacts and septal penetration and scatter that are important in collimator design, especially for medium energy and high energy photons. We developed ray-tracing code for calculating the geometric and penetration components of the point source response functions (PSRFs) for both parallel-hole and fan-beam collimator designs. We modeled septal penetration and scatter with the MCNP Monte Carlo code and obtained the geometric, penetration and scatter components of the collimator PSRFs. In order to verify the ray-tracing and Monte Carlo methods, we acquired data from a Ga-67 point source at the 93, 185 and 300 keV photon energies and at various distances from the face of a low energy parallel-hole, a medium energy parallel-hole and a low energy fan-beam collimator. The hole pattern artifacts obtained from the ray-tracing and Monte Carlo methods are in good agreement with experiment. The geometric and penetration components from the ray-tracing and Monte Carlo methods also agree. We conclude that the ray-tracing and Monte Carlo methods are useful in the initial design and detailed characterization of medium energy and high energy collimators.

Original languageEnglish (US)
Title of host publicationIEEE Nuclear Science Symposium and Medical Imaging Conference
PublisherIEEE
Pages2026-2030
Number of pages5
ISBN (Print)0780350227
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1998 IEEE Nuclear Science Symposium Conference Record - Toronto, Que, Can
Duration: Nov 8 1998Nov 14 1998

Publication series

NameIEEE Nuclear Science Symposium and Medical Imaging Conference
Volume3

Other

OtherProceedings of the 1998 IEEE Nuclear Science Symposium Conference Record
CityToronto, Que, Can
Period11/8/9811/14/98

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

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