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Titolo:
A projector/backprojector with slice-to-slice blurring for efficient three-dimensional scatter modeling
Autore:
Zeng, GL; Bai, CY; Gullberg, GT;
Indirizzi:
Univ Utah, Dept Radiol, CAMT, Salt Lake City, UT 84108 USA Univ Utah SaltLake City UT USA 84108 CAMT, Salt Lake City, UT 84108 USA
Titolo Testata:
IEEE TRANSACTIONS ON MEDICAL IMAGING
fascicolo: 8, volume: 18, anno: 1999,
pagine: 722 - 732
SICI:
0278-0062(199908)18:8<722:APWSBF>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAXIMUM-LIKELIHOOD; SIMULTANEOUS TRANSMISSION; ITERATIVE RECONSTRUCTION; NONUNIFORM ATTENUATION; SPECT RECONSTRUCTION; EMISSION TOMOGRAPHY; DETECTOR RESPONSE; COMPTON-SCATTER; PROJECTION DATA; COMPENSATION;
Keywords:
Gaussian blurring; iterative image reconstruction; scatter correction; SPECT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Engineering, Computing & Technology
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Zeng, GL Univ Utah, Dept Radiol, CAMT, 729 Arapeen Dr, Salt Lake City, UT 84108 USA Univ Utah 729 Arapeen Dr Salt Lake City UT USA 84108 UT 84108 USA
Citazione:
G.L. Zeng et al., "A projector/backprojector with slice-to-slice blurring for efficient three-dimensional scatter modeling", IEEE MED IM, 18(8), 1999, pp. 722-732

Abstract

Scatter correction is an important factor in single photon emission computed tomography (SPECT), Many scatter correction techniques, such as multiple-window subtraction and intrinsic modeling with iterative algorithms, have been under study for many years. Previously, we developed an efficient slice-to-slice blurring technique to model attenuation and system geometric response in a projector/backprojector pair, which was used in an ML-EM algorithm to reconstruct SPECT data. This paper proposes a projector/backprojectorthat models the three-dimensional (3-D) first-order scatter in SPECT, alsousing an efficient slice-to-slice blurring technique. The scatter responseis estimated from a known nonuniform attenuation distribution map. It is assumed that the probability of detection of a first-order scattered photon from a photon that is emitted in a given source voxel and scattered in a given scatter voxel is proportional to the attenuation coefficient value at that voxel, Monte Carlo simulations of point sources and an MCAT torso phantom were used to verify the accuracy of the proposed projector/backprojectormodel. An experimental Jaszczak torso/cardiac phantom SPECT study tvas also performed, For a 64 x 64 x 64 image volume, it took 8.7 s to perform eachiteration per slice on a Sun ULTRA Enterprise 3000 (167 MHz, 1 Gbyte RAM) computer, when modeling 3-D scatter, attenuation, and system geometric response functions. The main advantage of the proposed method is its easy implementation and the possibility of performing reconstruction in clinically acceptable time.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 08:32:00