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Titolo:
Sources of distortion in functional MRI data
Autore:
Jezzard, P; Clare, S;
Indirizzi:
John Radcliffe Hosp, FMRIB Ctr, Dept Clin Neurol, Oxford OX3 9DU, England John Radcliffe Hosp Oxford England OX3 9DU urol, Oxford OX3 9DU, England
Titolo Testata:
HUMAN BRAIN MAPPING
fascicolo: 2-3, volume: 8, anno: 1999,
pagine: 80 - 85
SICI:
1065-9471(1999)8:2-3<80:SODIFM>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMAGES;
Keywords:
functional MRI; distortions; echo planar imaging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Jezzard, P John Radcliffe Hosp, FMRIB Ctr, Dept Clin Neurol, Oxford OX3 9DU, England John Radcliffe Hosp Oxford England OX3 9DU d OX3 9DU, England
Citazione:
P. Jezzard e S. Clare, "Sources of distortion in functional MRI data", HUM BRAIN M, 8(2-3), 1999, pp. 80-85

Abstract

Functional magnetic resonance image (fMRI) experiments rely on the abilityto detect subtle signal changes in magnetic resonance image time series. Any areas of signal change that correlate with the neurological stimulus canthen be identified and compared with a corresponding high-resolution anatomical scan. This report reviews some of the several artefacts that are frequently present in fMRI data, degrading their quality and hence their interpretation. Zn particular, the effects of magnetic field inhomogeneities are described, both on echo planar imaging (EPI) data and on spiral imaging data. The modulation of these distortions as the subject moves in the magnet is described. The effects of gradient coil nonlinearities and EPI ghost correction schemes are also discussed. (C) 1999 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 05:45:34