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Titolo:
COMPARISON OF 180-DEGREES AND 360-DEGREES ITERATIVE RECONSTRUCTION WITH NONUNIFORM ATTENUATION COMPENSATION FOR T1-201 SPECT
Autore:
LACROIX KJ; TSUI BMW; HASEGAWA BH;
Indirizzi:
UNIV N CAROLINA,DEPT BIOMED ENGN CHAPEL HILL NC 27599 UNIV N CAROLINA,DEPT RADIOL CHAPEL HILL NC 27599 UNIV CALIF SAN FRANCISCO,DEPT RADIOL SAN FRANCISCO CA 94143 UNIV CALIF SAN FRANCISCO,BIOENGN GRAD GRP SAN FRANCISCO CA 94143
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 4, volume: 42, anno: 1995,
parte:, 1
pagine: 1276 - 1281
SICI:
0018-9499(1995)42:4<1276:CO1A3I>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
DATA-COLLECTION; TOMOGRAPHY; EMISSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
K.J. Lacroix et al., "COMPARISON OF 180-DEGREES AND 360-DEGREES ITERATIVE RECONSTRUCTION WITH NONUNIFORM ATTENUATION COMPENSATION FOR T1-201 SPECT", IEEE transactions on nuclear science, 42(4), 1995, pp. 1276-1281

Abstract

This study compares T1-201 SPECT images reconstructed from 180 degrees and 360 degrees projection data, using iterative reconstruction withnon-uniform attenuation compensation. Using a mathematical phantom ofthe human thorax, Monte Carlo simulation is used to produce both 180 degrees (45 degrees RAO to 45 degrees LPO) and 360 degrees T1-201 SPECT projection data. Included in the simulation are the effects of non-uniform attenuation, detector response, scatter and statistical noise. The 180 degrees and 360 degrees data were taken over 64 and 128 angles, respectively, assuming the same total acquisition time for both. Thesimulated projection data were reconstructed with non-uniform attenuation compensation using the ML-EM algorithm for 50 iterations and, forcomparison, were also reconstructed without attenuation compensation using the filtered backprojection method with a ramp filter. Transaxial slices of the reconstructed images, image profiles and Bull's-eye plots all show that images reconstructed with attenuation compensation, unlike those reconstructed without attenuation compensation, are essentially the same within the region of the myocardium for the 180 degrees and 360 degrees data, with few artifacts and similar image contrast. Furthermore, for the same total imaging time, the images reconstructed from the 180 degrees data have slightly less noise in the myocardialregion.

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Documento generato il 18/01/20 alle ore 07:47:28