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Titolo:
Efficient SPECT scatter calculation in non-uniform media using correlated Monte Carlo simulation
Autore:
Beekman, FJ; de Jong, HWAM; Slijpen, ETP;
Indirizzi:
Univ Utrecht Hosp, Image Sci Inst, Dept Nucl Med, NL-3584 CX Utrecht, Netherlands Univ Utrecht Hosp Utrecht Netherlands NL-3584 CX CX Utrecht, Netherlands
Titolo Testata:
PHYSICS IN MEDICINE AND BIOLOGY
fascicolo: 8, volume: 44, anno: 1999,
pagine: N183 - N192
SICI:
0031-9155(199908)44:8<N183:ESSCIN>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMAGE-RECONSTRUCTION; ORDERED SUBSETS; COMPENSATION; MODEL; IMPLEMENTATIONS; QUANTITATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Beekman, FJ Univ Utrecht Hosp, Image Sci Inst, Dept Nucl Med, NL-3584 CX Utrecht, Netherlands Univ Utrecht Hosp Utrecht Netherlands NL-3584 CX Netherlands
Citazione:
F.J. Beekman et al., "Efficient SPECT scatter calculation in non-uniform media using correlated Monte Carlo simulation", PHYS MED BI, 44(8), 1999, pp. N183-N192

Abstract

Accurate simulation of scatter in projection data of single photon emission computed tomography (SPECT) is computationally extremely demanding for activity distribution in nonuniform dense media. This paper suggests how the computation time and memory requirements can be significantly reduced. First the scatter projection of a uniform dense object (p(SDSE)) is calculated using a previously developed accurate and fast method which includes all orders of scatter (slab derived scatter estimation), and then p(SDSE) is transformed rewards the desired projection P which is based on the non-uniform object. The transform of p(SDSE) is based on two first-order Compton scarier Monte Carlo (MC) simulated projections. One is based on the uniform object (PU) and the other on the object with non-uniformities (P-nu). (P) over bar is estimated by (P) over bar = p(SDSE) p(nu)/ P-u. A tremendous decreasein noise in P is achieved by tracking photon paths for P-nu identical to those which were tracked for the calculation of P-u and by using analytical rather than stochastic modelling of the collimator. The method was validated by comparing the results with standard MC-simulated scatter projections (P) of Tc-99m and Tl-201 point sources in a. digital thorax phantom. After correction, excellent agreement was obtained between (P) over bar and P. Thetotal computation time required to calculate an accurate scatter projection of an extended distribution in a thorax phantom on a PC is a only few tens of seconds per projection, which makes the method attractive for application in accurate scatter correction in clinical SPECT. Furthermore, the method removes the need of excessive computer memory involved with previously proposed 3D model-based scatter correction methods.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 08:45:44