Contrast-enhanced coronary MR angiography: relationship between coronary artery delineation and blood T1.
J Magn Reson Imaging
; 14(4): 348-54, 2001 Oct.
Article
en En
| MEDLINE
| ID: mdl-11599057
Contrast-enhanced coronary angiography has become an important technique for magnetic resonance (MR) coronary artery imaging. However, the relationship between the quality of the coronary artery images and blood T1 has not yet been fully explored. In this paper, we assessed this relationship in an animal model by using a prototypical blood pool agent. With accumulated injections of this agent, the blood T1 would be maintained at different levels. The measured blood T1 values in vivo were 147 +/- 3, 82 +/- 6, 48 +/- 4, 40 +/- 3, and 30 +/- 8 msec (N = 7). Fixed and variable flip angle schemes were used in coronary artery imaging. The signal to noise ratios (SNR) of coronary arteries were measured and the image quality was assessed. It was found that blood T1 less than 80 msec might be desired. No statistically significant difference was observed between two flip angle schemes. There was better vessel definition using variable flip angle at blood T1 lower than 50 msec. Understanding this relationship may be beneficial to optimizing image protocol and/or design of blood pool contrast agents for contrast-enhanced coronary angiography.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Angiografía Coronaria
/
Angiografía por Resonancia Magnética
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
J Magn Reson Imaging
Asunto de la revista:
DIAGNOSTICO POR IMAGEM
Año:
2001
Tipo del documento:
Article
País de afiliación:
Italia
Pais de publicación:
Estados Unidos