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Titolo:
FAST IMPLEMENTATIONS OF RECONSTRUCTION-BASED SCATTER COMPENSATION IN FULLY 3D SPECT IMAGE-RECONSTRUCTION
Autore:
KADRMAS DJ; FREY EC; KARIMI SS; TSUI BMW;
Indirizzi:
UNIV N CAROLINA,DEPT BIOMED ENGN,CAMPUS BOX 7575,152 MACNIDER HALL CHAPEL HILL NC 27599 UNIV N CAROLINA,DEPT RADIOL CHAPEL HILL NC 27599
Titolo Testata:
Physics in medicine and biology
fascicolo: 4, volume: 43, anno: 1998,
pagine: 857 - 873
SICI:
0031-9155(1998)43:4<857:FIORSC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONTE-CARLO; PROJECTOR-BACKPROJECTOR; RESPONSE FUNCTION; EMISSION; TOMOGRAPHY; ALGORITHMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Kadrmas et al., "FAST IMPLEMENTATIONS OF RECONSTRUCTION-BASED SCATTER COMPENSATION IN FULLY 3D SPECT IMAGE-RECONSTRUCTION", Physics in medicine and biology, 43(4), 1998, pp. 857-873

Abstract

Accurate scatter compensation in SPECT can be performed by modelling the scatter response function during the reconstruction process. This method is called reconstruction-based scatter compensation (RBSC). It has been shown that RBSC has a number of advantages over other methodsof compensating for scatter, but using RBSC for fully 3D compensationhas resulted in prohibitively long reconstruction times. In this workwe propose two new methods that can be used in conjunction with existing methods to achieve marked reductions in RBSC reconstruction times. The first method, coarse-grid scatter modelling, significantly accelerates the scatter model by exploiting the fact that scatter is dominated by low-frequency information. The second method, intermittent RBSC,further accelerates the reconstruction process by limiting the numberof iterations during which scatter is modelled. The fast implementations were evaluated using a Monte Carlo simulated experiment of the 3D MCAT phantom with Te-99m tracer, and also using experimentally acquired data with Tl-201 tracer. Results indicated that these fast methods can reconstruct, with fully 3D compensation, images very similar to those obtained using standard RBSC methods, and in reconstruction times that are an order of magnitude shorter. Using these methods, fully 3D iterative reconstruction with RBSC can be performed well within the realm of clinically realistic times (under 10 minutes for 64 x 64 x 24 image reconstruction).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 01:21:30