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Titolo:
Investigation of 90 degrees dual-camera half-fanbeam collimation for myocardial SPECT imaging
Autore:
LaCroix, KJ; Tsui, BMW;
Indirizzi:
Univ N Carolina, Dept Biomed Engn, Chapel Hill, NC 27514 USA Univ N Carolina Chapel Hill NC USA 27514 Engn, Chapel Hill, NC 27514 USA Univ N Carolina, Dept Radiol, Chapel Hill, NC USA Univ N Carolina Chapel Hill NC USA ina, Dept Radiol, Chapel Hill, NC USA
Titolo Testata:
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
fascicolo: 6, volume: 46, anno: 1999,
parte:, 3
pagine: 2085 - 2092
SICI:
0018-9499(199912)46:6<2085:IO9DDH>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACQUISITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: LaCroix, KJ Univ N Carolina, Dept Biomed Engn, Chapel Hill, NC 27514 USA Univ N Carolina Chapel Hill NC USA 27514 l Hill, NC 27514 USA
Citazione:
K.J. LaCroix e B.M.W. Tsui, "Investigation of 90 degrees dual-camera half-fanbeam collimation for myocardial SPECT imaging", IEEE NUCL S, 46(6), 1999, pp. 2085-2092

Abstract

This study investigated several aspects of the use of half-fanbeam collimation with a 90 degrees dual-camera system for myocardial single photon emission computed tomography (SPECT) imaging. The detection efficiency, relative to parallel-hole collimation, was evaluated for a range of focal lengths and radii of rotation (ROR) to determine if there was an optimum focal length, which maximized the detection efficiency. In addition, sinograms were constructed and a simulation study was performed to determine if there was an optimal camera system rotation that maximized the total acquired myocardial counts while providing sufficient angular sampling for the myocardial region. Finally, artifacts in images reconstructed fi-om data acquired over various system rotations were evaluated using simulated and experimental data. There existed an optimal collimator focal length for a given ROR; but itvaried with ROR. Relative to parallel-hole collimation, the detection efficiency for half-fanbeam collimation was roughly 20% greater, for cast collimators constructed using the same pins and thickness. The theoretical minimum system rotation for sufficient sampling of the myocardial region ranged from 124 degrees to 148 degrees for RORs ranging from 13 to 25 cm, respectively. The total number of acquired myocardial counts was relatively constant for system rotations of 90 degrees to 360 degrees. Myocardial SPECT images reconstructed iteratively with attenuation compensation from half-fanbeamdata collected over system rotations ranging from 135 degrees to 360 degrees showed no artifacts in the myocardial region. Based on these results, weconcluded that there was no single optimum system rotation, but that a system rotation of 180 degrees centered at 45 degrees left anterior oblique was a good, practical minimum rotation. Half-fanbeam collimation is a useful alternative system configuration for myocardial SPECT imaging.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/01/20 alle ore 01:25:42