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Titolo:
Motion correction algorithms may create spurious brain activations in the absence of subject motion
Autore:
Freire, L; Mangin, JF;
Indirizzi:
Serv Hosp Frederic Joliot, CEA, F-91401 Orsay, France Serv Hosp Frederic Joliot Orsay France F-91401 EA, F-91401 Orsay, France Inst Med Nucl, FML, P-1649028 Lisbon, Portugal Inst Med Nucl Lisbon Portugal P-1649028 FML, P-1649028 Lisbon, Portugal
Titolo Testata:
NEUROIMAGE
fascicolo: 3, volume: 14, anno: 2001,
pagine: 709 - 722
SICI:
1053-8119(200109)14:3<709:MCAMCS>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
VOXEL SIMILARITY MEASURES; FMRI TIME-SERIES; IMAGE REGISTRATION; MUTUAL INFORMATION; FUNCTIONAL MRI; ARTIFACTS; MAXIMIZATION; OPTIMIZATION; ALIGNMENT;
Keywords:
fMRI; motion correction; artifact; spurious activation; robust registration;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Freire, L Serv Hosp Frederic Joliot, CEA, F-91401 Orsay, France Serv Hosp Frederic Joliot Orsay France F-91401 1 Orsay, France
Citazione:
L. Freire e J.F. Mangin, "Motion correction algorithms may create spurious brain activations in the absence of subject motion", NEUROIMAGE, 14(3), 2001, pp. 709-722

Abstract

This paper describes several experiments that prove that standard motion correction methods may induce spurious activations in some motion-free fMRI studies. This artifact stems from the fact that activated areas behave likebiasing outliers for the difference of square-based measures usually driving such registration methods. This effect is demonstrated first using a motion-free simulated time series including artificial activation-like signal changes. Several additional simulations explore the influence of activationamplitude and extent. The effect is finally highlighted on an actual time series obtained from a 3-T magnet. All the experiments are performed using four different realignment methods, which allows us to show that the problem may be overcome by methods based on a robust similarity measure like mutual information. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 00:54:06