Prospective respiratory motion correction for coronary MR angiography using a 2D image navigator.
Magn Reson Med
; 69(2): 486-94, 2013 Feb.
Article
em En
| MEDLINE
| ID: mdl-22529009
ABSTRACT
Respiratory motion remains the major impediment in a substantial amount of patients undergoing coronary magnetic resonance angiography. Motion correction in coronary magnetic resonance angiography is typically performed with a diaphragmatic 1D navigator (1Dnav) assuming a constant linear relationship between diaphragmatic and cardiac respiratory motion. In this work, a novel 2D navigator (2Dnav) is proposed, which prospectively corrects for translational motion in foot-head and left-right direction. First, 1Dnav- and 2Dnav-based motion correction are compared in 2D real time imaging experiments, by evaluating the residual respiratory motion in 10 healthy subjects as well as in a moving vessel phantom. Subsequently, 1Dnav and 2Dnav corrected high-resolution 3D coronary MR angiograms were acquired, and both objective and subjective image quality were assessed. For a gating window of 10 mm, 1Dnav and 2Dnav performed equally well; however, without any respiratory gating, the 1Dnav had a lower visual score for all coronary arteries compared with 10 mm gating, whereas the 2Dnav without gating performed similar to 1Dnav with 10 mm gating.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Interpretação de Imagem Assistida por Computador
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Aumento da Imagem
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Mecânica Respiratória
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Angiografia Coronária
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Artefatos
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Angiografia por Ressonância Magnética
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Técnicas de Imagem de Sincronização Respiratória
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Reino Unido