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Titolo:
An assessment of eddy current sensitivity and correction in single-shot diffusion-weighted imaging
Autore:
Koch, M; Norris, DG;
Indirizzi:
Max Planck Inst Cognit Neurosci, D-04103 Leipzig, Germany Max Planck Inst Cognit Neurosci Leipzig Germany D-04103 Leipzig, Germany
Titolo Testata:
PHYSICS IN MEDICINE AND BIOLOGY
fascicolo: 12, volume: 45, anno: 2000,
pagine: 3821 - 3832
SICI:
0031-9155(200012)45:12<3821:AAOECS>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ECHO-PLANAR IMAGES; WATER DIFFUSION; CEREBRAL-ISCHEMIA; CURRENT ARTIFACTS; RARE EXPERIMENTS; T2-WEIGHTED MRI; TENSOR; ANISOTROPY; SCHIZOPHRENIA; SPECTROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Koch, M Univ Hamburg, Klinikum Eppendorf, Neurol Klin, Martinistr 52, D-20246 Hamburg, Germany Univ Hamburg Martinistr 52 Hamburg Germany D-20246 mburg, Germany
Citazione:
M. Koch e D.G. Norris, "An assessment of eddy current sensitivity and correction in single-shot diffusion-weighted imaging", PHYS MED BI, 45(12), 2000, pp. 3821-3832

Abstract

Artefacts caused by eddy currents are a major problem in diffusion-weighted imaging. This is particularly acute in experiments in which a number of images with differing degrees of diffusion weighting and/or differently oriented diffusion-weighting gradients need to be combined. The echo-planar imaging sequence is particularly sensitive to the effects of residual eddy currents, especially due to the low bandwidth in the phase-encoding direction. Two published schemes are investigated regarding the effectiveness of eddycurrent correction. That of Jezzard et al (1998 Magn. Reson. Med 39 801-12) requires the acquisition of additional experimental data in order to perform a post-acquisition correction, whereas that of Wider er al (1994 J. Magn. Reson. A 108 255-8) attempts to reduce the eddy currents directly. It isfound that the latter experiment gives a somewhat superior performance anda combination of the two approaches results in an almost complete elimination of artefact. An alternative single-shot imaging experiment to echo-planar imaging is given by sequences based on fast spin-echo methods, which should be insensitive to the effects of constant eddy currents. It is shown that the intrinsiceddy-current-related artefact level in such experiments is indeed low, residual artefacts being attributed to eddy current decay during the echo train. In situations of poor main magnetic field homogeneity or large eddy currents such sequences may be gainfully used instead of echo-planar imaging.

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Documento generato il 02/04/20 alle ore 08:02:34