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Titolo:
AN INVESTIGATION OF DUAL-ENERGY TRANSMISSION MEASUREMENTS IN SIMULTANEOUS TRANSMISSION EMISSION IMAGING
Autore:
WELCH A; GULLBERG GT; CHRISTIAN PE; LI J; TSUI BMW;
Indirizzi:
UNIV UTAH,DEPT RADIOL,MED IMAGING RES LAB SALT LAKE CITY UT 84132 UNIV N CAROLINA,DEPT BIOMED ENGN CHAPEL HILL NC 27515 UNIV N CAROLINA,DEPT RADIOL CHAPEL HILL NC 27515
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 6, volume: 42, anno: 1995,
parte:, 2
pagine: 2331 - 2338
SICI:
0018-9499(1995)42:6<2331:AIODTM>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
NONUNIFORM ATTENUATION; SPECT; TOMOGRAPHY; CT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
A. Welch et al., "AN INVESTIGATION OF DUAL-ENERGY TRANSMISSION MEASUREMENTS IN SIMULTANEOUS TRANSMISSION EMISSION IMAGING", IEEE transactions on nuclear science, 42(6), 1995, pp. 2331-2338

Abstract

In this study we investigate the feasibility of acquiring dual energytransmission projection data using a conventional gamma camera, Transmission projection data are acquired, simultaneously with Tc-99m emission data, using the two major photopeaks of Gd-153, at 44 keV and 99 keV. The degree of contamination of the data in the 44 keV window, by scattered 99 keV transmission photons, is investigated using Monte Carlo simulations. A modified scaling method is proposed to convert the two attenuation maps, obtained from transmission data acquired at 44 keVand 99 keV, to one appropriate for Tc-99m. This attenuation map is compared to one produced by scaling the 99 KeV attenuation map, for the attenuation correction of Tc-99m SPECT images, The use of dual energy transmission imaging is shown to improve the quantitative accuracy of the reconstructed SPECT images compared to a single scale factor method, However, for situations where a dual scaling factor method is possible, this is shown to perform as well as the dual energy method, Dual energy transmission imaging is shown to be more effective at visualizing areas of bone, particularly in regions near the edge of the untruncated field of view.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/01/20 alle ore 12:24:04