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Titolo:
Influence of EEG electrodes on the BOLD fMRI signal
Autore:
Bonmassar, G; Hadjikhani, N; Ives, JR; Hinton, D; Belliveau, JW;
Indirizzi:
Massachusetts Gen Hosp, A Martinos Ctr, Charlestown, MA 02139 USA Massachusetts Gen Hosp Charlestown MA USA 02139 Charlestown, MA 02139 USA Beth Israel Deaconess Med Ctr, Dept Neurol, Boston, MA 02215 USA Beth Israel Deaconess Med Ctr Boston MA USA 02215 l, Boston, MA 02215 USA
Titolo Testata:
HUMAN BRAIN MAPPING
fascicolo: 2, volume: 14, anno: 2001,
pagine: 108 - 115
SICI:
1065-9471(200110)14:2<108:IOEEOT>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN VISUAL-CORTEX; MAGNETIC-RESONANCE SPECTROSCOPY; FUNCTIONAL MRI; EPILEPSY; LOCALIZATION; STIMULATION; ACTIVATION; CONTRAST; PATIENT; AREAS;
Keywords:
electroencephalography; functional magnetic resonance imaging; MRI; MRI artifacts; magnetic susceptibility; eddy currents; chemical shifts;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Bonmassar, G Massachusetts Gen Hosp, A Martinos Ctr, Bldg 149 13th St, Charlestown, MA 02139 USA Massachusetts Gen Hosp Bldg 149 13th St Charlestown MA USA 02139
Citazione:
G. Bonmassar et al., "Influence of EEG electrodes on the BOLD fMRI signal", HUM BRAIN M, 14(2), 2001, pp. 108-115

Abstract

Measurement of the EEG during fMRI scanning can give rise to image distortions due to magnetic susceptibility, eddy currents or chemical shift artifacts caused by certain types of EEG electrodes, cream, leads, or amplifiers. Two different creams were tested using MRS and T2* measurements, and we found that the one with higher water content was superior. This study introduces an index that quantifies the influence of EEG equipment on the BOLD fMRI signal. This index can also be used more generally to measure the changesin the fMRI signal due to the presence of any type of device inside (or outside) of the field of view (e.g., with fMRI and diffuse optical tomography, infrared imaging, transcranial magnetic stimulation, ultrasound imaging, etc.). Quantitative noise measurements are hampered by the normal variability of functional activation within the same subject and by the different slice profiles obtained when inserting a subject multiple times inside a MR imaging system. Our measurements account for these problems by using a matched filtering of cortical surface maps of functional activations. The results demonstrate that the BOLD signal is not influenced by the presence of EEGelectrodes when using a properly constructed MRI compatible recording cap.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/01/20 alle ore 14:57:30