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Titolo:
Design of a logarithmic k-space spiral trajectory
Autore:
Cline, HE; Zong, XL; Gai, N;
Indirizzi:
GE Corp Res & Dev, Schenectady, NY USA GE Corp Res & Dev Schenectady NY USA Corp Res & Dev, Schenectady, NY USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 6, volume: 46, anno: 2001,
pagine: 1130 - 1135
SICI:
0740-3194(200112)46:6<1130:DOALKS>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ARTIFACTS;
Keywords:
spiral; pulse sequence design; trajectory; logarithmic; cardiac;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Cline, HE GE Corp Res & Dev, 1 Res Circle,K1-1C32, Schenectady, NY USA GE Corp Res & Dev 1 Res Circle,K1-1C32 Schenectady NY USA Y USA
Citazione:
H.E. Cline et al., "Design of a logarithmic k-space spiral trajectory", MAGN RES M, 46(6), 2001, pp. 1130-1135

Abstract

Spiral acquisitions are used in fast cardiac imaging because they traversek-space efficiently and minimize flow artifacts. A variable pitch logarithmic spiral trajectory is designed to critically sample the low-frequency region in k-space and gradually undersample the high-frequency region. An approximate analytical expression for the trajectory provides a fast means to calculate the gradient waveforms and the sampled data points. A numerical method is introduced based on the trajectory curvature and the rate of change in the gradient magnitude with time for the composite Archimedean-logarithmic trajectory. The pulse sequence is implemented and images are acquired on phantoms and human hearts. The images show improved image resolution andsome improvement in image quality as a result of increased extent in k-space and reduction in aliasing artifacts, respectively. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/01/20 alle ore 07:22:39