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Titolo:
Modeling respiratory mechanics in the MCAT and spline-based MCAT phantoms
Autore:
Segars, WP; Lalush, DS; 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 27514 USA Univ N Carolina Chapel Hill NC USA 27514 adiol, Chapel Hill, NC 27514 USA
Titolo Testata:
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
fascicolo: 1, volume: 48, anno: 2001,
parte:, 1
pagine: 89 - 97
SICI:
0018-9499(200102)48:1<89:MRMITM>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOTION; SPECT; HEART; ATTENUATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Segars, WP Univ N Carolina, Dept Biomed Engn, Chapel Hill, NC 27514 USA Univ N Carolina Chapel Hill NC USA 27514 el Hill, NC 27514 USA
Citazione:
W.P. Segars et al., "Modeling respiratory mechanics in the MCAT and spline-based MCAT phantoms", IEEE NUCL S, 48(1), 2001, pp. 89-97

Abstract

Respiratory motion can cause artifacts in myocardial SPECT and computed tomography (CT). We incorporate models of respiratory mechanics into the current 4D MCAT and into the next generation spline-based MCAT phantoms. In order to simulate respiratory motion in the current MCAT phantom, the geometric solids for the diaphragm, heart, ribs, and lungs were altered through manipulation of parameters defining them. Affine transformations were applied to the control points defining the same respiratory structures in the spline-based MCAT phantom to simulate respiratory motion. The Non-Uniform Rational B-Spline (NURBS) surfaces for the lungs and body outline were constructed in such a way as to be linked to the surrounding ribs. Expansion and contraction of the thoracic cage then coincided with expansion and contraction of the lungs and body. The changes both phantoms underwent were spline-interpolated over time to create time continuous 4D respiratory models. We thenused the geometry-based and spline-based MCAT phantoms in an initial simulation study of the effects of respiratory motion on myocardial SPECT. The simulated reconstructed images demonstrated distinct artifacts in the inferior region of the myocardium. We conclude that both respiratory models can be effective tools for researching effects of respiratory motion.

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Documento generato il 26/01/20 alle ore 01:16:18