Pseudo-continuous arterial spin labeling at 7 T for human brain: estimation and correction for off-resonance effects using a Prescan.
Magn Reson Med
; 69(2): 402-10, 2013 Feb.
Article
em En
| MEDLINE
| ID: mdl-22488568
ABSTRACT
Pseudo-continuous arterial spin labeling (ASL) can provide best signal-to-noise ratio efficiency with a sufficiently long tag at high fields such as 7 T, but it is very sensitive to off-resonance fields at the tagging location. Here, a robust Prescan procedure is demonstrated to estimate the pseudo-continuous ASL radiofrequency phase and gradients parameters required to compensate the off-resonance effects at each vessel location. The Prescan is completed in 1-2 min and is based on acquisition of label/control pair-wise ASL data as a function of the radiofrequency phase increment applied to the pseudo-continuous ASL train. It is shown that this approach can be used to acquire high quality whole-brain pseudo-continuous ASL perfusion data of the human brain at 7 T.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Encéfalo
/
Interpretação de Imagem Assistida por Computador
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Aumento da Imagem
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Artérias Cerebrais
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Circulação Cerebrovascular
/
Artefatos
/
Angiografia por Ressonância Magnética
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Revista:
Magn Reson Med
Assunto da revista:
DIAGNOSTICO POR IMAGEM
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos