Non-contrast-enhanced renal and abdominal MR angiography using velocity-selective inversion preparation.
Magn Reson Med
; 69(5): 1268-75, 2013 May.
Article
em En
| MEDLINE
| ID: mdl-22711643
ABSTRACT
Non-contrast-enhanced MR angiography is a promising alternative to the established contrast-enhanced approach as it reduces patient discomfort and examination costs and avoids the risk of nephrogenic systemic fibrosis. Inflow-sensitive slab-selective inversion recovery imaging has been used with great promise, particularly for abdominal applications, but has limited craniocaudal coverage due to inflow time constraints. In this work, a new non-contrast-enhanced MR angiography method using velocity-selective inversion preparation is developed and applied to renal and abdominal angiography. Based on the excitation k-space formalism and Shinnar-Le-Roux transform, a velocity-selective excitation pulse is designed that inverts stationary tissues and venous blood while preserving inferiorly flowing arterial blood. As the magnetization of the arterial blood in the abdominal aorta and iliac arteries is well preserved during the magnetization preparation, artery visualization over a large abdominal field of view is achievable with an inversion delay time that is chosen for optimal background suppression. Healthy volunteer tests demonstrate that the proposed method significantly increases the extent of visible arteries compared with the slab-selective approach, covering renal arteries through iliac arteries over a craniocaudal field of view of 340 mm.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Aorta Abdominal
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Artéria Renal
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Algoritmos
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Interpretação de Imagem Assistida por Computador
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Aumento da Imagem
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Angiografia por Ressonância Magnética
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Artéria Ilíaca
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