Scatter model for parallel and converging beam SPECT based on the Klein-Nishina formula

Zongjian Cao, E. C. Frey, B. M.W. Tsui

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

Abstract

In this study, a scatter model is derived for parallel-beam, fan-beam, and cone-beam geometries in SPECT imaging. In the model, a photon is allowed to be scattered only once, and the probability of scatter for a given angle and energy is calculated using the Klein-Nishina formula. The detector is assumed to have perfect energy resolution. The scatter counts are computed for every projection array. From the scatter counts, the scatter line source response function and scatter-to-primary ratio are obtained. They agree well with those of Monte Carlo (MC) simulation including only single scattering, but deviate from those of full MC simulation including both single and multiple scattering. The deviation depends on the source depth within the medium. For a source depth of 6 cm, the difference of the scatter-to-primary ratio between the model and full MC simulation is less than 7%, while the difference becomes 27% for parallel-beam and 32% for cone-beam geometry at a source depth of 21.6 cm. Since scatter accounts for 20-40% of the total counts in most clinical studies, the scatter model yields a SPR accuracy ranged from 3% to 12%. The scatter model provides an efficient mean of characterizing scatter response with reasonable accuracy, and can be used in developing scatter compensation techniques in converging-beam SPECT.

Original languageEnglish (US)
Title of host publicationIEEE Nuclear Science Symposium & Medical Imaging Conference
PublisherPubl by IEEE
Pages1179-1183
Number of pages5
Editionpt 2
ISBN (Print)0780314875
StatePublished - Jan 1 1994
EventProceedings of the 1993 IEEE Nuclear Science Symposium & Medical Imaging Conference - San Francisco, CA, USA
Duration: Oct 30 1993Nov 6 1993

Publication series

NameIEEE Nuclear Science Symposium & Medical Imaging Conference
Numberpt 2

Other

OtherProceedings of the 1993 IEEE Nuclear Science Symposium & Medical Imaging Conference
CitySan Francisco, CA, USA
Period10/30/9311/6/93

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Industrial and Manufacturing Engineering

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    Cao, Z., Frey, E. C., & Tsui, B. M. W. (1994). Scatter model for parallel and converging beam SPECT based on the Klein-Nishina formula. In IEEE Nuclear Science Symposium & Medical Imaging Conference (pt 2 ed., pp. 1179-1183). (IEEE Nuclear Science Symposium & Medical Imaging Conference; No. pt 2). Publ by IEEE.