Four-dimensional phase contrast MRI with accelerated dual velocity encoding.
J Magn Reson Imaging
; 35(6): 1462-71, 2012 Jun.
Article
em En
| MEDLINE
| ID: mdl-22282344
ABSTRACT
PURPOSE:
To validate a novel approach for accelerated four-dimensional phase contrast MR imaging (4D PC-MRI) with an extended range of velocity sensitivity. MATERIALS ANDMETHODS:
4D PC-MRI data were acquired with a radially undersampled trajectory (PC-VIPR). A dual V(enc) (dV(enc) ) processing algorithm was implemented to investigate the potential for scan time savings while providing an improved velocity-to-noise ratio. Flow and velocity measurements were compared with a flow pump, conventional 2D PC MR, and single V(enc) 4D PC-MRI in the chest of 10 volunteers.RESULTS:
Phantom measurements showed excellent agreement between accelerated dV(enc) 4D PC-MRI and the pump flow rate (R(2) ≥ 0.97) with a three-fold increase in measured velocity-to-noise ratio (VNR) and a 5% increase in scan time. In volunteers, reasonable agreement was found when combining 100% of data acquired with V(enc) = 80 cm/s and 25% of the high V(enc) data, providing the VNR of a 80 cm/s acquisition with a wider velocity range of 160 cm/s at the expense of a 25% longer scan.CONCLUSION:
Accelerated dual V(enc) 4D PC-MRI was demonstrated in vitro and in vivo. This acquisition scheme is well suited for vascular territories with wide ranges of flow velocities such as congenital heart disease, the hepatic vasculature, and others.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Algoritmos
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Interpretação de Imagem Assistida por Computador
/
Aumento da Imagem
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Imagem Cinética por Ressonância Magnética
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Imageamento Tridimensional
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Técnicas de Imagem de Sincronização Cardíaca
Tipo de estudo:
Diagnostic_studies
Limite:
Aged
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Aged80
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Female
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Humans
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Male
/
Middle aged
Idioma:
En
Revista:
J Magn Reson Imaging
Assunto da revista:
DIAGNOSTICO POR IMAGEM
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Estados Unidos