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Titolo:
Slab scan diffusion imaging
Autore:
Maier, SE;
Indirizzi:
Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Radiol, Boston, MA 02115 USA Harvard Univ Boston MA USA 02115 h Med, Dept Radiol, Boston, MA 02115 USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 6, volume: 46, anno: 2001,
pagine: 1136 - 1143
SICI:
0740-3194(200112)46:6<1136:SSDI>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPIN-ECHO; WHOLE-BRAIN; FREE IMAGES; MR-IMAGES; MOTION; STROKE; ACQUISITION; ARTIFACTS; PULSES; TENSOR;
Keywords:
diffusion-weighted imaging; diffusion tensor imaging; line scan; echo-planar imaging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Maier, SE Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Radiol, 75 Francis St, Boston, MA 02115 USA Harvard Univ 75 Francis St Boston MA USA 02115 ton, MA 02115 USA
Citazione:
S.E. Maier, "Slab scan diffusion imaging", MAGN RES M, 46(6), 2001, pp. 1136-1143

Abstract

For maximum robustness of a diffusion-weighted MR imaging sequence, it is desirable to use a single-shot imaging method. This article introduces a new single-shot imaging approach that combines the advantages of multiple spin-echoes with the technique of line scan diffusion imaging. A slab volume, which can be spatially encoded with fewer phase encodes than a regular field of view, is selected with 2D selective pulses. With the shorter echo train, the sensitivity to field inhomogeneities and chemical shift is thus greatly diminished. Further reduction is achieved by interleaving short gradient echo trains with refocusing spin-echo pulses. Optimized slice-selective RF pulses that produce flip angles close to 180 degrees are used to minimizethe stimulated echo component. Motion-related phase shifts, which change polarity with each spin-echo excitation, will give rise to artifacts that are avoidable by processing even and odd spin-echoes separately. As with linescan diffusion imaging, the complete field of view is acquired by sequential scanning. Since with each shot several lines of data are collected, a considerable improvement over line scan diffusion imaging in terms of scanning speed is achieved. Diffusion data obtained in phantoms and normal subjects demonstrate the feasibility of this novel approach. (C) 2001 Wiley-Liss, Inc.

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Documento generato il 27/01/20 alle ore 08:07:32