Magnetic resonance signal intensity patterns obtained from continuous and pulsatile flow models.
Radiology
; 151(2): 421-8, 1984 May.
Article
en En
| MEDLINE
| ID: mdl-6709913
The purpose of this investigation was to extend previous steady state flow studies with magnetic resonance (MR) to pulsatile flow measurements obtained with gated cardiac techniques in man with a pulsatile artificial heart device. Bovine blood and a solution of MnCl2 were studied. Correlation was made with complex and time-varying MR signals observed in the descending aorta on cardiac gated images obtained through the midthorax. MR signals from flowing fluids represent velocity distribution as shown in a velocity profile, and laminar flow is distinguished from nonlaminar. At very slow flow rates, signal intensity is lower than background. As the rate is increased, paradoxical enhancement occurs followed by loss of signal, which is complete at 7 liters per minute with fluid and 15 liters per minute with blood. These areas correspond to maximum fluid velocities of 41 and 88 cm/sec, respectively.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Velocidad del Flujo Sanguíneo
/
Espectroscopía de Resonancia Magnética
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Radiology
Año:
1984
Tipo del documento:
Article
Pais de publicación:
Estados Unidos