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Titolo:
Online motion correction for diffusion-weighted imaging using navigator echoes: Application to RARE imaging without sensitivity loss
Autore:
Norris, DG; Driesel, W;
Indirizzi:
Max Planck Inst Cognit Neurosci, D-04103 Leipzig, Germany Max Planck Inst Cognit Neurosci Leipzig Germany D-04103 Leipzig, Germany
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 5, volume: 45, anno: 2001,
pagine: 729 - 733
SICI:
0740-3194(200105)45:5<729:OMCFDI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MR; ACQUISITION; ARTIFACTS; FMRI;
Keywords:
diffusion-weighted imaging; online motion correction; navigator echoes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Norris, DG Max Planck Inst Cognit Neurosci, Stephanstr 1A, D-04103 Leipzig, Germany Max Planck Inst Cognit Neurosci Stephanstr 1A Leipzig Germany D-04103
Citazione:
D.G. Norris e W. Driesel, "Online motion correction for diffusion-weighted imaging using navigator echoes: Application to RARE imaging without sensitivity loss", MAGN RES M, 45(5), 2001, pp. 729-733

Abstract

This article describes the first application of true online motion correction to diffusion-weighted RARE imaging. Two orthogonal navigator echoes were acquired and zeroth and first-order phase corrections applied in less than 8 ms between a diffusion-weighted magnetization preparation and data acquisition using the RARE sequence. The zeroth-order phase correction was realized by pulsing the system's B-O-coil: the first-order error corrected withappropriate magnetic field gradient pulses. Online correction ensured thatno irreversible signal loss could occur in the imaging experiment. Diffusion-weighted images of the brain were obtained from healthy volunteers. EGG-triggered acquisition was applied at 400 ms after the R-wave. Data were acquired on a matrix of 256 x 256 with a RARE factor of 16 and a b-value of 804 smm(-2). The images obtained with online motion correction showed a remarkably high image quality, while those acquired without motion correction were severely degraded by artifacts. (C) 2001 Wiley-Liss, Inc.

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Documento generato il 19/01/20 alle ore 01:09:51