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Titolo:
BLOCK-ITERATIVE TECHNIQUES FOR FAST 4D RECONSTRUCTION USING A-PRIORI MOTION MODELS IN GATED CARDIAC SPECT
Autore:
LALUSH DS; TSUI BMW;
Indirizzi:
UNIV N CAROLINA,DEPT BIOMED ENGN 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: 875 - 886
SICI:
0031-9155(1998)43:4<875:BTFF4R>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMAGE-RECONSTRUCTION; GIBBS PRIOR; TOMOGRAPHY; EMISSION; ATTENUATION; ALGORITHMS; EM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
D.S. Lalush e B.M.W. Tsui, "BLOCK-ITERATIVE TECHNIQUES FOR FAST 4D RECONSTRUCTION USING A-PRIORI MOTION MODELS IN GATED CARDIAC SPECT", Physics in medicine and biology, 43(4), 1998, pp. 875-886

Abstract

We introduce a fast block-iterative maximum a posteriori (MAP) reconstruction algorithm and apply it to four-dimensional reconstruction of gated SPECT perfusion studies. The new algorithm, called RBI-MAP, is based on the rescaled block iterative EM (RBI-EM) algorithm. We developRBI-MAP based on similarities between the RBI-EM, ML-EM and MAP-EM algorithms. RBI-MAP requires far fewer iterations than MAP-EM, and so should result in acceleration similar to that obtained from using RBI-EMor OS-FM as opposed to ML-EM. When complex four-dimensional clique structures are used in the prior, however, evaluation of the smoothing prior dominates the processing time. We show that a simple scheme for updating the prior term in the heart region only for RBI-MAP results insavings in processing time of a factor of six over MAP-EM. The RBI-MAP algorithm incorporating 3D collimator-detector response compensationis demonstrated on a simulated Tc-99m gated perfusion study. Results of RBI-MAP are compared with RBI-EM followed by a 4D linear filter. For the simulated study, we find that RBI-MAP provides consistently higher defect contrast for a given degree of noise smoothing than does filtered RBI-EM. This is an indication that RBI-MAP smoothing does less to degrade resolution gained from 3D detector response compensation than does a linear filter. We conclude that RBI-MAP can provide smooth four-dimensional reconstructions with good visualization of heart structures in clinically realistic processing times.

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Documento generato il 20/01/20 alle ore 16:25:49