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Titolo:
Spiral-in/out BOLD fMRI for increased SNR and reduced susceptibility artifacts
Autore:
Glover, GH; Law, CS;
Indirizzi:
Stanford Univ, Sch Med, Dept Radiol, Ctr Adv MR Technol, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 dv MR Technol, Stanford, CA 94305 USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 3, volume: 46, anno: 2001,
pagine: 515 - 522
SICI:
0740-3194(200109)46:3<515:SBFFIS>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN BRAIN ACTIVATION; FUNCTIONAL MRI; GRADIENT-ECHO; OLFACTORY CORTEX; SINGLE-SHOT; REDUCTION; COMPENSATION;
Keywords:
functional magnetic resonance imaging; spiral in/out trajectories; susceptibility artifacts; signal dropout; reversed spiral method;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Glover, GH Stanford Univ, Sch Med, Dept Diagnost Radiol, Lucas MR Ctr, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 tr, Stanford, CA 94305 USA
Citazione:
G.H. Glover e C.S. Law, "Spiral-in/out BOLD fMRI for increased SNR and reduced susceptibility artifacts", MAGN RES M, 46(3), 2001, pp. 515-522

Abstract

BOLD fMRI is hampered by dropout of signal in the orbitofrontal and parietal brain regions due to magnetic field gradients near air-tissue interfaces. This work reports the use of spiral-in trajectories that begin at the edge of k-space and end at the origin, and spiral in/out trajectories in whicha spiral-in readout is followed by a conventional spiral-out trajectory. The spiral-in trajectory reduces the dropout and increases the BOLD contrast. The spiral-in and spiral-out images can be combined in several ways to simultaneously achieve increased signal-to-noise ratio (SNR) and reduced dropout artifacts. Activation experiments employing an olfaction task demonstrate significantly increased activation volumes due to reduced dropout, and overall increased SNR in all regions. (C) 2001 Wiley-Liss, Inc.

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Documento generato il 27/01/20 alle ore 01:23:17