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Titolo:
A SCATTER MODEL FOR PARALLEL AND CONVERGING BEAM SPECT BASED ON THE KLEIN-NISHINA FORMULA
Autore:
CAO ZJ; FREY EC; TSUI BMW;
Indirizzi:
UNIV N CAROLINA,DEPT BIOMED ENGN CHAPEL HILL NC 27514 UNIV N CAROLINA,DEPT RADIOL CHAPEL HILL NC 27514
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 4, volume: 41, anno: 1994,
parte:, 1
pagine: 1594 - 1600
SICI:
0018-9499(1994)41:4<1594:ASMFPA>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENERGY-WEIGHTED ACQUISITION; MONTE-CARLO; PRACTICAL METHOD; COMPENSATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
Z.J. Cao et al., "A SCATTER MODEL FOR PARALLEL AND CONVERGING BEAM SPECT BASED ON THE KLEIN-NISHINA FORMULA", IEEE transactions on nuclear science, 41(4), 1994, pp. 1594-1600

Abstract

In this study, a scatter model is proposed for parallel-, fan-, and cone-beam SPECT imaging. In this model, a photon is allowed to be scattered only once, and the probability of scatter for given angle and energy is computed by using the Klein-Nishina formula. The detector is assumed to have perfect energy resolution. The scatter counts are computed for every projection bin. From the scatter counts, the scatter linesource response function and scatter-to-primary ratio (SPR) are obtained. They agree well with those from Monte Carlo (MC) simulation including only single scattering, but deviate from those from 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 andfull MC simulation is less than 7%, while for a 21.6 cm source depth,the difference goes up to 27% for parallel-beam geometry and 32% for cone-beam geometry. Since scatter accounts for 20-40% of the total counts in most clinical studies, the scatter model yields a SPR accuracy that ranges from 3% to 12%. The scatter model provides an effective means to estimate the scatter response with reasonable accuracy, and canbe used in developing scatter compensation techniques in parallel- and converging-beam SPECT.

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Documento generato il 25/02/20 alle ore 07:24:34