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Titolo:
Physiological noise in oxygenation-sensitive magnetic resonance imaging
Autore:
Kruger, G; Glover, GH;
Indirizzi:
Stanford Univ, Dept Radiol, Lucas MRS Ctr, Palo Alto, CA 94304 USA Stanford Univ Palo Alto CA USA 94304 cas MRS Ctr, Palo Alto, CA 94304 USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 4, volume: 46, anno: 2001,
pagine: 631 - 637
SICI:
0740-3194(200110)46:4<631:PNIOMR>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN BRAIN; FMRI; CONTRAST; CORTEX; TESLA; MRI; EPI;
Keywords:
neuroimaging; spiral scan; magnetic field strength; SNR; physiological noise;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Kruger, G Siemens AG, Dept MREA, Karl Schall Str 6, D-91052 Erlangen, Germany Siemens AG Karl Schall Str 6 Erlangen Germany D-91052 , Germany
Citazione:
G. Kruger e G.H. Glover, "Physiological noise in oxygenation-sensitive magnetic resonance imaging", MAGN RES M, 46(4), 2001, pp. 631-637

Abstract

The physiological noise in the resting brain, which arises from fluctuations in metabolic-linked brain physiology and subtle brain pulsations, was investigated in six healthy volunteers using oxygenation-sensitive dual-echo spiral MRI at 3.0 T. In contrast to the system and thermal noise, the physiological noise demonstrates a signal strength dependency and, unique to themetabolic-linked noise, an echo-time dependency. Variations of the MR signal strength by changing the flip angle and echo time allowed separation of the different noise components and revealed that the physiological noise at3.0 T (1) exceeds other noise sources and (2) is significantly greater in cortical gray matter than in white matter regions. The SNR in oxygenation-sensitive MRI is predicted to saturate at higher fields, suggesting that noise measurements of the resting brain at 3.0 T and higher may provide a sensitive probe of functional information. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 07:24:02