Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
ENERGY WINDOW OPTIMIZATION IN SIMULTANEOUS TC-99M TCT AND THALLIUM-2O1 SPECT DATA-ACQUISITION
Autore:
LI J; TSUI BMW; WELCH A; FREY EC; GULLBERG GT;
Indirizzi:
UNIV N CAROLINA,DEPT BIOMED ENGN CHAPEL HILL NC 27599 UNIV UTAH,DEPT RADIOL SALT LAKE CITY UT 84132
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 4, volume: 42, anno: 1995,
parte:, 1
pagine: 1207 - 1213
SICI:
0018-9499(1995)42:4<1207:EWOIST>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATTENUATION CORRECTION; NONUNIFORM ATTENUATION; SIMULTANEOUS EMISSION; COMPUTED-TOMOGRAPHY; TRANSMISSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
J. Li et al., "ENERGY WINDOW OPTIMIZATION IN SIMULTANEOUS TC-99M TCT AND THALLIUM-2O1 SPECT DATA-ACQUISITION", IEEE transactions on nuclear science, 42(4), 1995, pp. 1207-1213

Abstract

In simultaneous Tc-99m TCT and Tl-201 SPECT data acquisition, the emission images are degraded by not only scatter from the emission source, but also cross-contamination from the transmission photons. Also, the transmission images are degraded by scatter from the transmission source and cross-contamination from the emission photons. In this work, a criterion based on maximizing a Figure-of-Merit (FOM) was used to reduce image degradations by optimizing the position and width of the energy windows used in the data acquisition in a triple-camera fan-beam SPECT system. The FOM determines a compromise between increased detection efficiency of primary photons and reduction of scatter and cross-contamination photons. Scatter in the projection data was modeled usingMonte Carlo (MC) simulation methods, Experimental studies were performed to verify the simulations and to estimate the amount of Pb x-rays and scatter in the collimator which were not modeled in the MC program. Results suggest that cross-contamination degrades the emission and transmission data. However, the contamination does not significantly alter the optimal energy window settings, which should be centered at similar to 77 keV with a window width of similar to 34% for detecting the Tl emission photons, and centered at 140 keV with a window width of similar to 20% for detecting the Tc transmission photons.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 07:15:36